Data Sheet

INTEGRATED CIRCUITS
DATA SHEET
SAA7706H
Car radio Digital Signal Processor
(DSP)
Product specification
File under Integrated Circuits, IC01
2001 Mar 05
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
1
FEATURES
8.13
8.14
8.14.1
1.1
1.2
Hardware
Software
8.14.2
2
APPLICATIONS
3
GENERAL DESCRIPTION
4
QUICK REFERENCE DATA
5
ORDERING INFORMATION
6
BLOCK DIAGRAM
7
PINNING
8
FUNCTIONAL DESCRIPTION
8.1
8.1.1
8.1.2
Analog front-end
The realization of common mode input with AIC
Realization of the auxiliary input with volume
control
Realization of the FM input control
Pins VDACN1, VDACN2 and VDACP
Pin VREFAD
Supply of the analog inputs
The signal audio path for input signals CD,
TAPE, AUX, PHONE, NAV and AM
Signal path for level information
Signal path from FM_MPX input to IAC and
stereo decoder
Noise level
Mono or stereo switching
The automatic lock system
DCS clock
The Interference Absorption Circuit (IAC)
General description
The Filter Stream DAC (FSDAC)
Interpolation filter
Noise shaper
Function of pin POM
Power-off plop suppression
Pin VREFDA for internal reference
Supply of the filter stream DAC
Clock circuit and oscillator
Supply of the crystal oscillator
The phase-locked loop circuit to generate the
DSPs and other clocks
Supply of the digital part (VDDD3V1 to VDDD3V4)
CL_GEN, audio clock recovery block
External control pins
DSP1
DSP2
CONTENTS
8.1.3
8.1.4
8.1.5
8.1.6
8.2
8.3
8.4
8.4.1
8.4.2
8.4.3
8.5
8.6
8.6.1
8.7
8.7.1
8.7.2
8.7.3
8.7.4
8.7.5
8.7.6
8.8
8.8.1
8.9
8.10
8.11
8.12
8.12.1
8.12.2
2001 Mar 05
8.14.3
8.15
8.15.1
8.15.2
8.15.3
8.15.4
8.16
8.17
I2C-bus control (pins SCL and SDA)
Digital serial inputs/outputs and SPDIF inputs
General description digital serial audio
inputs/outputs
General description SPDIF inputs (SPDIF1 and
SPDIF2)
Digital data stream formats
RDS demodulator (pins RDS_CLOCK
and RDS_DATA)
Clock and data recovery
Timing of clock and data signals
Buffering of RDS data
Buffer interface
DSP reset
Test mode connections (pins TSCAN, RTCB
and SHTCB)
9
I2C-BUS FORMAT
9.1
9.2
9.3
9.4
9.5
9.5.1
9.6
Addressing
Slave address (pin A0)
Write cycles
Read cycles
SAA7706H hardware registers
SAA7706H DSPs registers
I2C-bus memory map specification
10
LIMITING VALUES
11
THERMAL CHARACTERISTICS
12
CHARACTERISTICS
13
RDS AND I2S-BUS TIMING
14
I2C-BUS TIMING
15
SOFTWARE DESCRIPTION
16
APPLICATION DIAGRAM
17
PACKAGE OUTLINE
18
SOLDERING
18.1
Introduction to soldering surface mount
packages
Reflow soldering
Wave soldering
Manual soldering
Suitability of surface mount IC packages for
wave and reflow soldering methods
18.2
18.3
18.4
18.5
2
SAA7706H
19
DATA SHEET STATUS
20
DEFINITIONS
21
DISCLAIMERS
22
PURCHASE OF PHILIPS I2C COMPONENTS
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
1
SAA7706H
FEATURES
1.1
Hardware
• 5-bitstream 3rd-order sigma-delta Analog-to-Digital
Converters (ADCs) with anti-aliasing broadband input
filter
• 1-bitstream 1st-order sigma-delta ADC with anti-aliasing
broadband input filter
• Easy applicable.
• 4-bitstream Digital-to-Analog Converters (DACs) with
128-fold oversampling and noise shaping
1.2
• Integrated semi-digital filter; no external post filter
required for DAC
• Integrated 19 kHz MPX filter; de-emphasis and stereo
detection
• Dual media support: allowing separate front-seat and
rear-seat signal sources and separate control
• Electronic adjustments: FM or AM level, FM channel
separation, Dolby®(1) level
• Simultaneous radio and audio processing
• Digital FM stereo decoder
• Baseband audio processing (treble, bass, balance,
fader and volume)
• Digital FM interference suppression
• Four channel 5-band parametric equalizer
• RDS demodulation via separate ADC; with buffered
output option
• 9-bands mono audio spectrum analyzer
Software
• Improved FM weak signal processing
• Extended beep functions with tone sequencer for phone
rings
• Two mono Common-Mode Rejection Ratio (CMRR)
input stages for voice signals from phone and navigation
inputs
• Large volume jumps e-power interpolated to prevent
zipper noise
• Phone and navigation mixing at DAC front outputs
• Dual media support; allowing separate front-seat and
rear-seat signal sources and separate control
• Two stereo CMRR input stages (CD-walkman and
CD-changer etc.)
• Dynamic loudness or bass boost
• Analog single-ended TAPE and AUX input
• Audio level monitor
• Separate AM-left and AM-right inputs in the event of use
of external AM stereo decoder
• Tape equalization and Music Search System (MSS)
detection for tape
• One digital input: I2S-bus or LSB-justified format
• Dolby-B tape noise reduction (at 44.1 kHz only)
• Two digital inputs: SPDIF format
• Dynamics compression available in all modes
• Co-DSP support via I2S-bus or LSB-justified format
• CD de-emphasis processing
• Audio output short-circuit protected
• Voice-over possibility for phone and navigation signals
•
• Improved AM signal processing
I2C-bus
controlled (including fast mode)
• MOST bus interfacing (details in separate manual)
• Digital AM CQUAM stereo decoder (not in all
rom_codes available)
• Phase-locked loop derives the internal clocks from one
common fundamental crystal oscillator
• Digital AM interference suppression
• Combined AM/FM level input
• Soft audio mute
• Pin compatible with SAA7705 and SAA7708
• All digital inputs are tolerant of 5 V input levels
• RDS update processing: pause detection, mute and
signal-quality sensor-freeze
• All analog inputs have high GSM immunity
• General purpose tone generator
• Low number of external components required
(1) Dolby — Available only to licensees of Dolby Laboratories
Licensing Corporation, San Francisco, CA94111, USA, from
whom licensing and application information must be obtained.
Dolby is a registered trade-mark of Dolby Laboratories
Licensing Corporation.
• −40 to +85 °C operating temperature range
2001 Mar 05
3
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
• Noise generator allows for frequency response
measurements
SAA7706H
• RDS-demodulation
• FM and AM weak signal processing (soft mute, sliding
stereo and high cut)
• Boot-up ROM for fast start-up
• Signal level, noise and multipath detection for AM or FM
signal quality information
• Dolby-B tape noise reduction
• AM co-channel and adjacent channel detection (not in
all rom_codes available).
• Audio controls for volume, balance, fader, tone and
dynamics compression.
2
• CD de-emphasis function
Some functions have been implemented in hardware
(FM stereo decoder, RDS-demodulator and
FM Interference Absorption Circuit (IAC) and are not freely
programmable.
APPLICATIONS
• High-end car radio systems.
3
Digital audio signals from external sources with the Philips
I2S-bus and the LSB-justified 16, 18, 20 and 24 bits format
or SPDIF format are accepted.
GENERAL DESCRIPTION
The SAA7706H performs all the signal functions in front of
the power amplifiers and behind the car radio tuner
AM and FM outputs and the CD, tape and phone inputs.
These functions are:
The big advantage of this SAA7706H device is the ‘dual
media support’; this enables independent front seat and
rear seat audio sources and control.
• Interference absorption
• Stereo decoding for FM and AM (stereo)
4
QUICK REFERENCE DATA
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Supplies
VDD
operating supply voltage
all VDD pins with respect
to VSS
3
3.3
3.6
V
IDDD
supply current of the digital part
DSP1 at 50 MHz; DSP2
at 62.9 MHz
−
110
150
mA
IDDA
supply current of the analog part
zero input and output
signal
−
40
60
mA
Ptot
total power dissipation
DSP1 at 50 MHz; DSP2
at 62.9 MHz
−
540
750
mW
Vi(con)(max)(rms)
maximum conversion input level
(RMS value)
THD < 1%;
VOLFM = 00H
0.33
0.368
−
V
THD
total harmonic distortion
input signal 0.368 V
(RMS) at 1 kHz;
bandwidth = 19 kHz;
VOLFM = 00H
−
−70
−65
dB
−
0.03
0.056
%
input signal at 1 kHz;
75
bandwidth = 40 kHz;
0 dB reference = 0.368 V
(RMS); VOLFM = 00H
81
−
dB
THD < 1%
0.66
−
V
FM_MPX input
S/N
signal-to-noise ratio input stereo
CD, TAPE, AUX and AM inputs
Vi(con)(max)(rms)
2001 Mar 05
maximum conversion input level
(RMS value)
4
0.6
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
PARAMETER
CONDITIONS
SAA7706H
MIN.
TYP.
MAX.
UNIT
THD
total harmonic distortion
input signal 0.55 V
(RMS) at 1 kHz;
bandwidth = 20 kHz
−
−85
−75
dB
S/N
signal-to-noise ratio
input signal at 1 kHz;
bandwidth = 20 kHz;
0 dB reference = 0.55 V
(RMS)
85
90
−
dB
total harmonic distortion-plus-noise to at 0 dB
signal ratio (measured with system
at −60 dB; A-weighted
one)
−
−90
−85
dB
−
−37
−
dB
signal-to-noise ratio (measured with
system one)
−
105
−
dB
−
11.2896 −
FSDAC
(THD + N)/S
S/N
code = 0; A-weighted
Crystal oscillator
fxtal
5
crystal frequency
MHz
ORDERING INFORMATION
TYPE
NUMBER
SAA7706H
2001 Mar 05
PACKAGE
NAME
QFP80
DESCRIPTION
plastic quad flat package; 80 leads (lead length 1.95 mm);
body 14 × 20 × 2.8 mm
5
VERSION
SOT318-2
73
4
3
LEVELADC
STEREO
CMRR
INPUTS
77
14
STEREO
DECODER
DSP2_INOUT1
DSP2_INOUT2
DSP2_INOUT3
DSP2_INOUT4
DSP1_IN1
DSP1_IN2
DSP1_OUT1
DSP1_OUT2
VDDD3V4
DIGITAL
SOURCE
SELECTOR
13
12
8
ANALOG
SOURCE
SELECTOR
69
68
35
A
DIGITAL
SOURCE
SELECTORS
MONO
ADC3
30
DIGITAL
I/O
DSP2
B
33
31
32
80
RDS
DEMODULATOR
79
XTAL
OSCILLATOR
POM
FLV
I2S-BUS
SPDIF
FRV
RLV
RRV
VREFDA
IIS_OUT1
IIS_OUT2
IIS_CLK
IIS_WS
IIS_IN1
IIS_IN2
I2C-BUS
20
LOOPO
61
43 44 45
21
60
59 62 65 63
64 26 29 27 28
24 25
57 58 56
42
DSP_RESET
CD_WS
CD_DATA
CD_CLK
SYSFS
Product specification
Fig.1 Block diagram.
SAA7706H
OSC_OUT
MGT457
OSC_IN
SEL_FR
+
6
STEREO
ADC2
VSS(OSC)
FM_RDS
16
9
VDD(OSC)
FM_MPX
66
7
RDS_CLOCK
TAPE_R
+
34
RDS_DATA
TAPE_L
QUAD
FSDAC
DSP1
67
TP1
AUX_R
VDDD3V3
SIGNAL
QUALITY
SAA7706H
STEREO
ADC1
TSCAN
AUX_L
VDDD3V2
SIGNAL
LEVEL
78
RTCB
AM_R/AM
VSSA2
72
70
SHTCB
6
AM_L/NAV
VDDA2
PHONE
VOLUME
IAC
VREFAD
VDDD3V1
VSSD3V7
VSSD3V6
VSSD3V5
VSSD3V4
VSSD3V3
VSSD3V2
VSSD3V1
VDDD3V7
VDDD3V6
VDDD3V5
5
MONO
CMRR
INPUTS
A0
CD_R_GND
10
SDA
CD_(L)_GND
71
SCL
CD_R
41 40 39 38 19 18 15 17
11
SPDIF1
CD_L
48 51 52 55
SPDIF2
LEVEL
VSSA1
VDDA1
NAV_GND
49 50 53 54 47 37 23
Philips Semiconductors
PHONE_GND
46 36 22
Car radio Digital Signal Processor (DSP)
PHONE
76 75
2
BLOCK DIAGRAM
VDACN1
74
1
6
VDACP
ook, full pagewidth
2001 Mar 05
VDACN2
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Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
7
SAA7706H
PINNING
SYMBOL
PIN
PIN TYPE
DESCRIPTION
VDACP
1
apio
positive reference voltage ADC1, ADC2, ADC3 and level-ADC
VDACN1
2
apio
ground reference voltage ADC1
LEVEL
3
apio gsmcap
LEVEL input pin; via this pin the level of the FM signal or level of the
AM signal is fed to the DSP1; the level information is used in the DSP1 for
dynamic signal processing
NAV_GND
4
apio gsmcap
common mode reference input pin of the navigation signal (pin AM_L/NAV)
POM
5
apio
power-on mute of the QFSDAC; timing is determined by an external
capacitor
RRV
6
apio
rear; right audio output of the QFSDAC
AUX_L
7
apio
left channel of analog AUX input
AUX_R
8
apio
right channel of analog AUX input
RLV
9
apio
rear; left audio output of the QFSDAC
VSSA2
10
vssco
ground supply analog part of the QFSDAC and SPDIF bitslicer
VDDA2
11
vddco
positive supply analog part of the QFSDAC and SPDIF bitslicer
VREFDA
12
apio
voltage reference of the analog part of QFSDAC
FRV
13
apio
front; right audio output of the QFSDAC
CD_R_GND
14
apio
common-mode reference input pin for analog CD_R or TAPE_R in the
event of separated ground reference pins for left and right are used
DSP2_INOUT2
15
bpts5thdt5v
flag input/output 2 of the DSP2-core (DSP2-flag) I2C-bus configurable
FLV
16
apio
front; left audio voltage output of the QFSDAC
DSP2_INOUT1
17
bpts5thdt5v
flag input/output 1 of the DSP2-core (DSP2-flag) I2C-bus configurable
DSP2_INOUT3
18
bpts5thdt5v
flag input/output 3 of the DSP2-core (DSP2-flag) I2C-bus configurable
DSP2_INOUT4
19
bpts5thdt5v
flag input/output 4 of the DSP2-core (DSP2-flag) I2C-bus configurable
LOOPO
20
bpts5tht5v
SYSCLK output (256fs)
TP1
21
ipthdt5v
for test purpose only; this pin may be left open or connected to ground
VDDD3V7
22
vdde
positive supply (peripheral cells only)
VSSD3V7
23
vsse
ground supply (peripheral cells only)
SPDIF2
24
apio
SPDIF input 2; can be selected instead of SPDIF1 via I2C-bus bit
SPDIF1
25
apio
SPDIF input 1; can be selected instead of SPDIF2 via I2C-bus bit
SYSFS
26
ipthdt5v
system fs clock input
CD_WS
27
ipthdt5v
digital CD-source word select input; I2S-bus or LSB-justified format
CD_DATA
28
bpts10thdt5v
digital CD-source left-right data input; I2S-bus or LSB-justified format
CD_CLK
29
ipthdt5v
digital CD-source clock input I2S-bus or LSB-justified format
IIS_CLK
30
ots10ct5v
clock output for external I2S-bus receiver; for example headphone or
subwoofer
IIS_IN1
31
ipthdt5v
data 1 input for external I2S-bus transmitter; e.g. audio co-processor
IIS_IN2
32
ipthdt5v
data 2 input for external I2S-bus transmitter; e.g. audio co-processor
IIS_WS
33
ots10ct5v
word select output for external I2S-bus receiver; for example headphone or
subwoofer
IIS_OUT1
34
ots10ct5v
data 1 output for external I2S-bus receiver or co-processor
IIS_OUT2
35
ots10ct5v
data 2 output for external I2S-bus receiver or co-processor
2001 Mar 05
7
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
VDDD3V6
PIN
36
PIN TYPE
SAA7706H
DESCRIPTION
vdde
positive supply (peripheral cells only)
VSSD3V6
37
vsse
ground supply (peripheral cells only)
DSP1_IN1
38
bpts10thdt5v
flag input 1 of the DSP1-core
DSP1_IN2
39
bpts10thdt5v
flag input 2 of the DSP1-core
DSP1_OUT1
40
op4mc
flag output 1 of the DSP1-core
DSP1_OUT2
41
op4mc
flag output 2 of the DSP1-core
DSP_RESET
42
iptut5v
general reset of chip (active LOW)
RTCB
43
ipthdt5v
asynchronous reset test control block; connect to ground (internal
pull-down)
SHTCB
44
ipthdt5v
shift clock test control block (internal pull-down)
TSCAN
45
ipthdt5v
scan control active high (internal pull-down)
VDDD3V5
46
vdde
positive supply (peripheral cells only)
VSSD3V5
47
vsse
ground supply (peripheral cells only)
VDDD3V1
48
vddi
positive supply (core only)
VSSD3V1
49
vssis
ground supply (core only)
VSSD3V2
50
vssco
ground supply (core only)
VDDD3V2
51
vddco
positive supply (core only)
VDDD3V3
52
vddco
positive supply (core only)
VSSD3V3
53
vssco
ground supply (core only)
VSSD3V4
54
vssis
ground supply (core only)
VDDD3V4
55
vddi
positive supply (core only)
A0
56
ipthdt5v
slave sub-address I2C-bus selection or serial data input test control block
SCL
57
iptht5v
serial clock input I2C-bus
SDA
58
iic400kt5v
serial data input/output I2C-bus
RDS_CLOCK
59
bpts10tht5v
radio data system bit clock output or RDS external clock input I2C-bus bit
controlled
RDS_DATA
60
ops10c
radio data system data output
SEL_FR
61
iptht5v
AD input selection switch to enable high ohmic FM_MPX input at fast tuner
search on FM_RDS input
VSS(OSC)
62
vssco
ground supply (crystal oscillator only)
OSC_IN
63
apio
crystal oscillator input
OSC_OUT
64
apio
crystal oscillator output
VDD(OSC)
65
vddco
positive supply (crystal oscillator only)
AM_R/AM
66
apio gsmcap
right channel AM audio frequency or AM input in the event of mono;
analog input pin
AM_L/NAV
67
apio gsmcap
left channel AM audio frequency or input of common mode navigation
signal; analog input pin
TAPE_R
68
apio gsmcap
right channel of analog TAPE input
TAPE_L
69
apio gsmcap
left channel of analog TAPE input
CD_R
70
apio gsmcap
right channel of analog CD input
PHONE
71
apio gsmcap
common mode PHONE signal, analog input pin
CD_L
72
apio gsmcap
left channel of analog CD input
2001 Mar 05
8
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
SAA7706H
PIN
PIN TYPE
DESCRIPTION
PHONE_GND
73
apio gsmcap
common mode reference input pin of the PHONE signal
VDDA1
74
vddco
positive supply analog (ADC1, ADC2, ADC3 and level-ADC only)
VSSA1
75
vssco
ground supply analog (ADC3 and level-ADC only)
VDACN2
76
apio
ground reference voltage (ADC2)
CD_(L)_GND
77
apio gsmcap
common mode reference input pin for analog CD or TAPE or in the event of
separated ground reference pins used for CD_L or TAPE_L
VREFAD
78
apio
common mode reference voltage ADC1, ADC2, ADC3 and level-ADC
FM_RDS
79
apio gsmcap
FM RDS signal; analog input pin
FM_MPX
80
apio gsmcap
FM multiplex signal; analog input pin
Table 1
Brief explanation of used pin types
PIN TYPE
EXPLANATION
apio
3-state I/O analog; I/O pad cell; actually pin type vddco
apio gsmcap
3-state I/O analog; I/O pad cell; actually pin type vddco with high GSM immunity
bpts5thdt5v
43 MHz bidirectional pad; push-pull input; 3-state output; 5 ns slew rate control; TTL; hysteresis;
pull-down; 5 V tolerant
bpts10tht5v
21 MHz bidirectional pad; push-pull input; 3-state output; 10 ns slew rate control; TTL; hysteresis;
5 V tolerant
bpts10thdt5v
21 MHz bidirectional pad; push-pull input; 3-state output; 10 ns slew rate control; TTL; hysteresis;
pull-down; 5 V tolerant
iic400kt5v
I2C-bus pad; 400 kHz I2C-bus specification; TTL; 5 V tolerant
iptht5v
input pad buffer; TTL; hysteresis; 5 V tolerant
ipthdt5v
input pad buffer; TTL; hysteresis; pull-down; 5 V tolerant
iptut5v
input pad buffer; TTL; pull-up; 5 V tolerant
op4mc
output pad buffer; 4 mA output drive; CMOS; slew rate control; 50 MHz
ots10ct5v
output pad buffer; 3-state, 10 ns slew rate control; CMOS; 5 V tolerant
ops10c
output pad buffer; 4 mA output drive; CMOS; slew rate control; 21 MHz
vdde
VDD supply peripheral only
vsse
VSS supply peripheral only
vddco
VDD supply to core only
vssco
VSS supply to core only (vssco does not connect the substrate)
vddi
VDD supply to core and peripheral
vssis
VSS supply to core and peripheral; with substrate connection
2001 Mar 05
9
Philips Semiconductors
Product specification
65 VDD(OSC)
66 AM_R/AM
67 AM_L/NAV
68 TAPE_R
69 TAPE_L
70 CD_R
SAA7706H
71 PHONE
72 CD_L
73 PHONE_GND
74 VDDA1
75 VSSA1
76 VDACN2
78 VREFAD
79 FM_RDS
80 FM_MPX
handbook, full pagewidth
77 CD_(L)_GND
Car radio Digital Signal Processor (DSP)
VDACP
1
64 OSC_OUT
VDACN1
2
63 OSC_IN
LEVEL
3
62 VSS(OSC)
NAV_GND 4
61 SEL_FR
POM
5
60 RDS_DATA
RRV
6
59 RDS_CLOCK
AUX_L
7
58 SDA
AUX_R
8
57 SCL
RLV
9
56 A0
VSSA2 10
55 VDDD3V4
VDDA2 11
54 VSSD3V4
53 VSSD3V3
VREFDA 12
SAA7706H
FRV 13
52 VDDD3V3
CD_R_GND 14
51 VDDD3V2
DSP2_INOUT2 15
50 VSSD3V2
FLV 16
49 VSSD3V1
DSP2_INOUT1 17
48 VDDD3V1
DSP2_INOUT3 18
47 VSSD3V5
DSP2_INOUT4 19
46 VDDD3V5
LOOPO 20
45 TSCAN
TP1 21
44 SHTCB
Fig.2 Pinning diagram.
2001 Mar 05
10
DSP1_OUT1 40
DSP1_IN2 39
DSP1_IN1 38
VSSD3V6 37
VDDD3V6 36
IIS_OUT2 35
IIS_OUT1 34
IIS_WS 33
IIS_IN2 32
IIS_IN1 31
IIS_CLK 30
41 DSP1_OUT2
CD_CLK 29
SPDIF2 24
CD_DATA 28
42 DSP_RESET
CD_WS 27
VSSD3V7 23
SYSFS 26
43 RTCB
SPDIF1 25
VDDD3V7 22
MGT458
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8
8.1
FUNCTIONAL DESCRIPTION
The PHONE and NAV inputs have their own CMRR input
stage and can be redirected to ADC1/2 via the Audio Input
Control (AIC). For pin compatibility with SAA7704,
SAA7705 and SAA7708 the AM is combined with the NAV
input. It is also possible to directly mix PHONE or NAV
(controlled with MIXC) with the front FSDAC channels
after volume control. The FM inputs (FM_MPX/FM_RDS)
can be selected with external pin SEL_FR. The
FM and RDS input sensitivity can be adjusted with VOLFM
and VOLRDS via I2C-bus.
Analog front-end
The analog front-end consists of two identical sigma-delta
stereo ADCs (ADC1 and ADC2) with several input control
blocks for handling common mode signals and acting as
input selector. A mono version (ADC3) is added for
handling RDS signals. Also a first-order sigma-delta ADC
for tuner level information is incorporated.
The switches S1 and S2 select (see Fig.3) between the
FM_MPX/FM_RDS and the CD, TAPE, AUX, AM,
PHONE and NAV connection to ADC1 and ADC2. The
inputs CD, TAPE, AUX, AM, PHONE and NAV can be
selected with the audio input controls (AIC1/2). The
ground reference (G0 and G1) can be selected to be able
to handle common mode signals for CD or TAPE. The
ground reference G0 is connected to an external pin
and G1 is internally referenced (see Fig.4).
2001 Mar 05
SAA7706H
11
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
CLKLEVEL
LEVEL
3
LEVEL-ADC
LEVELO
VOLRDS(5:0)
SEL_FR
FM_RDS
FM_MPX
CD_L
TAPE_L
S3
61
79
80
1
0 MUX
72
69
GNDC1
AUX_L
CD_R
TAPE_R
AM_R/AM
AUX_R
CD_(L)_GND
VREFAD
CD_R_GND
7
VOLFM(5:0)
x00 AIC1(2:0)
GNDRC1
x01
x10
MUX
011
1
111
0 MUX
0
1 MUX
x00
x01
x10
MUX
011
111
70
68
66
8
77
78
14
GNDC2
0
1 MUX
PHONE
PHONE_GND
AM_L/NAV
NAV_GND
71
73
CMRR
67
4
CMRR
ADF3
S1
0
1 MUX
0
1 MUX
LEFT1
STEREO
ADC1
ADF1_a
RIGHT1
fmhsnr_adc1
x00 AIC2(2:0)
GNDRC2
x01
x10
MUX
1
011
0
111
MUX
x00
x01
x10
MUX
011
111
RDS
MONO (RDS)
ADC3
CLKADC2
0
1 MUX
MIDREF
0
1 MUX
CLKADC2
0
1 MUX
charge_pump
S2
0
1 MUX
0
1 MUX
LEFT2
STEREO
ADC2
ADF1_b
RIGHT2
CLKADC2
fmhsnr_adc2
MIXC
VOLMIX(5:2)
1
0 MUX
MIX
VOLMIX(4:0)
located in FIRDAC
MGT459
Fig.3 Analog front-end switch diagram.
2001 Mar 05
12
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.1.1
THE REALIZATION OF COMMON MODE INPUT WITH
AIC
SAA7706H
In Fig.4 the CD input is selected. In this situation both
signal lines going to S1/2 in front of the ADC will contain
the common mode signal. The ADC itself will suppress this
common mode signal with a high rejection ratio. The inputs
CD_L and CD_R in this example are connected via an
external resistor tap of 82 kΩ and 100 kΩ to be able to
handle larger input signals. The 100 kΩ resistors are
needed to provide a DC biasing of the operational
amplifiers OA1 and OA2. The 1 MΩ resistor provides
DC biasing of OA3 and OA4. If no external resistor tap is
needed the resistors of 100 kΩ and 1 MΩ still have to
provide DC biasing. Only the 82 kΩ resistor can be
removed. The impedance level in combination with
parasitic capacitance at input CD_L or CD_R determines
for a great deal the achievable common rejection ratio.
A high common mode rejection ratio can be created by the
use of the ground return pin. Pin CD_(L)_GND can be
used in the case that the left and right channel have one
ground return line. CD_(L)_GND and CD_R_GND can be
used for separated left and right ground return lines. The
ground return lines can be connected via the switch
GNDC1/2 and GNDRC1/2 (see Fig.4) to the plus input of
the second operational amplifier in the signal path. The
signal of which a high common mode rejection ratio is
required has a signal and a common signal as input. The
common signal is connected to the CD_(L)_GND and/or
CD_R_GND input. The actual input can be selected with
audio input control AIC1/2(1:0).
handbook, full pagewidth
10 kΩ
82 kΩ
CD_L
LEFT
72
00
01
10 MUX
11
10 kΩ
to MUX S1/2
10 kΩ
OA1
OA3
100 kΩ
AIC1/2(1:0)
G1
CD_(L)_GND
GROUND
LEFT
from
CD-player
analog
77
G0
1 MΩ
GNDC1/2
VREFAD 78
GNDRC1/2
MIDREF
1 MΩ
CD_R_GND
14
GROUND
RIGHT
82 kΩ
RIGHT
10 kΩ
10 kΩ
100 kΩ
CD_R
70
to MUX S1/2
00
01
10 MUX
11
10 kΩ
OA2
OA4
MGT460
off-chip
on-chip
Fig.4 Example of the use of common mode analog input in combination with input resistor tap.
2001 Mar 05
13
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
0 dB (full-scale)
660 mV (RMS)
Audio
ADC
GAIN
AUDIO
DIGITAL
FILTER
5 dB GAIN
DSP2
STEREO
DECODER
3 dB GAIN
DSP1
−2 dB (full-scale)
MGT461
Fig.5 Audio gain through ADC and digital filter path to DSP.
8.1.2
REALIZATION OF THE AUXILIARY INPUT WITH VOLUME
8.1.3
CONTROL
The gain of the circuit has a maximum of 2.26 (7.08 dB).
This results in an input level of 368 mV for full-scale, which
means 0 dB (full-scale) at the DSP1 input via the stereo
decoder (see Fig.6). The gain can be reduced in steps of
1.5 dB. When the gain is set to −3.4 dB the input level
becomes 1229 mV for full-scale. This setting accounts for
the 200 mV (RMS) input sensitivity at 22.5 kHz sweep and
a saturation of the input at 138 kHz sweep.
A differential input with volume control for mixing to the
front left or front right of both DAC outputs is provided. The
inputs consist of a PHONE and NAV input. Both are
accompanied with their ground return lines. After selection
of PHONE or NAV the volume can be changed from about
+18 to −22.5 dB in 27 steps and mute (MIX output). This
signal can be added to the left and/or right front DAC
channels.
RDS update: for RDS update the fast access pin SEL_FR
must be made HIGH. In that case the FM_RDS signal also
goes through the path that was set for FM_MPX. In this
situation the signal must be obtained via the FM_RDS
input and a noise sample can be retrieved. The input
FM_MPX gets high-ohmic. Charging of the coupling
capacitor connected to pin FM_MPX is no longer possible.
The output signals of both input circuits can also be
switched to ADC1 and/or ADC2, depending on the settings
of audio input control 1 (AIC1) and audio input control 2
(AIC2), without volume control (see Fig.3).
handbook, full pagewidth
REALIZATION OF THE FM INPUT CONTROL
831 mV (RMS)
FM
GAIN
AUDIO
DIGITAL
FILTER
5 dB GAIN
ADC
DSP2
0 dB (full-scale)
STEREO
DECODER
3 dB GAIN
DSP1
MGT462
Fig.6 FM gain path through stereo decoder to DSP1.
2001 Mar 05
14
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.1.4
PINS VDACN1, VDACN2 AND VDACP
8.1.6
SAA7706H
SUPPLY OF THE ANALOG INPUTS
These pins are used as negative and positive reference for
the ADC1, 2, 3 and the level-ADC. They have to be directly
connected to the VSSA1 and filtered VDDA1 for optimal
performance (see Figs 25 and 26).
The analog input circuit has separate power supply
connections to allow maximum filtering. These pins are
VSSA1 for the analog ground and VDDA1 for the analog
power supply.
8.1.5
8.2
PIN VREFAD
Via this pin the midref voltage of the ADCs is filtered. This
midref voltage is used as half supply voltage reference of
the ADCs. External capacitors (connected to VSSA1)
prevent crosstalk between switch cap DACs of the ADCs
and buffers and improves the power supply rejection ratio
of all components. This pin is also used in the application
as reference for the inputs TAPE and CD (see Fig.4). The
voltage on pin VREFAD is determent by the voltage on
pins VDACP and VDACN1 or VDACN2 and is found as:
V VDACP – V VDACN1,2
V VREFAD = --------------------------------------------------2
The signal audio path for input signals CD,
TAPE, AUX, PHONE, NAV and AM
The left and right channels are converted and
down-sampled by the ADF1_a, ADF1_b. This data stream
is converted into a serial format and fed to the DSP1 and
DSP2 source selectors. In Figs 7 and 8 the overall and
detailed frequency response curves of the
analog-to-digital audio decimation path based on a
44.1 kHz sample frequency are shown.
MGT463
0
handbook, full pagewidth
α
(dB)
−50
−100
−150
−200
−250
Fig.7
0
100
200
300
400
f (kHz)
500
Overall frequency response curve analog-to-digital audio path decimation based on a 44.1 kHz sample
frequency.
2001 Mar 05
15
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
α
SAA7706H
MGT464
20
handbook, full pagewidth
(dB)
0
−20
−40
−60
−80
−100
−120
−140
Fig.8
0
10
20
30
40
f (kHz)
50
Detailed frequency response curve analog-to-digital audio path decimation based on a 44.1 kHz sample
frequency.
2001 Mar 05
16
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.3
Signal path for level information
SAA7706H
The tolerance on the gain is less than 2%. The MSB is
always logic 0 to represent a positive level. Input level
span can be increased by an external resistor tap. The
high input impedance of the level-ADC makes this
possible.
For FM weak signal processing, for AM and FM purposes
(absolute level and multipath) a level input is implemented
(pin LEVEL). In the event of radio reception the clocking of
the filters and the level-ADC is based on a 38 kHz
sampling frequency. A DC input signal is converted by a
bitstream sigma-delta ADC followed by a decimation filter.
The decimation filter reduces in the event of an 38 kHz
based clocking regime the bandwidth of the incoming
signal to a frequency range of 0 to 29 kHz with a resulting
fs = 76 kHz. The response curve is given in Fig.9.
The input signal has to be obtained from a radio part. The
tuner must deliver the level information of either AM or FM
to pin LEVEL.
The level information is sub-sampled by the DSP1 to
obtain a field strength and a multipath indication. These
values are stored in the coefficient or data RAM. Via the
I2C-bus they can be read and used in other microcontroller
programs.
The input signal for level must be in the range 0 to 3.3 V
(VVDACP − VVDACN). The 9-bit level-ADC converts this
input voltage in steps with a resolution better than at least
14 mV over the 3.3 V range.
MGT465
10
handbook, full pagewidth
α
(dB)
0
−10
−20
−30
−40
−50
−60
0
10
20
30
40
50
60
Fig.9 Frequency response level-ADC and decimal filter.
2001 Mar 05
17
70
f (kHz)
80
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.4
Signal path from FM_MPX input to IAC and
stereo decoder
SAA7706H
After selection of one of the ADCs, the FM_MPX path it is
followed by the IAC and the FM stereo decoder. One of the
two MPX filter outputs contains the multiplex signal with a
frequency range of 0 to 60 kHz. The overall low-pass
frequency response of the decimation filters is shown in
Fig.10.
The FM_MPX signal is after selection available at one of
three ADCs (ADC1, 2 and 3). The multiplex FM signal is
converted to the digital domain in ADC1, 2 and 3 through
a bitstream ADC. Improved performance for FM stereo
can be achieved by means of adapting the noise shaper
curve of the ADC to a higher bandwidth.
The first decimation takes place in two down-sample
filters. These decimation filters are switched by means of
the I2C-bus bit wide_narrow in the wide or narrow band
position. In the event of FM reception it must be in the
narrow position.
MGT466
0
handbook,αfull pagewidth
(dB)
−20
−40
−60
−80
−100
−120
−140
0
100
200
300
400
Fig.10 Overall frequency response of ADC1, ADC2 and decimation filters.
2001 Mar 05
18
f (kHz)
500
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
The outputs of the stereo decoder to the DSP1, which are
all running on a sample frequency of 38 kHz are:
SAA7706H
Normally the FM_MPX input and the FM_RDS input have
the same source. If the FM input contains a stereo radio
channel, the pilot information is switched to the Digitally
Controlled Sampling (DCS) clock generation and the DCS
clock is locked to the 256 × 38 kHz of the pilot. In this case
this locked frequency is also used for the RDS path
ensuring the best possible performance.
• Pilot presence indication: pilot-I. This 1-bit signal is LOW
for a pilot frequency deviation <4 kHz and HIGH for a
pilot frequency deviation >4 kHz and locked on a pilot
tone.
• ‘Left’ and ‘right’ FM reception stereo signal: this is the
18-bit output of the stereo decoder after the matrix
decoding.
Except from the above mentioned theoretical response
also the non-flat frequency response of the ADC has to be
compensated in the DSP1 program.
• Noise level (see also Section 8.4.1): which is retrieved
from the high-pass output of the MPX filter. The noise
level is detected and filtered in the DSP1 and is used to
optimize the FM weak signal processing.
MGT467
handbook, full pagewidth
0
α
(dB)
−20
−40
−60
−80
−100
0
10
20
30
40
50
60
f (kHz)
Fig.11 Transfer of MPX signal at the output of the stereo decoder.
2001 Mar 05
19
70
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.4.1
NOISE LEVEL
SAA7706H
The resulting noise information is rectified and has a word
length of 10 bits. This means that the lowest and/or the
highest possible level is not used. The noise level can be
detected and filtered in the DSP1-core and be used to
optimize the FM weak signal processing. The transfer
curves of both filters before decimation are shown in
Fig.12.
The high-pass 1 (HP1 or narrow band noise level filter)
output of the second MPX decimation filter in a band from
60 kHz to 120 kHz is detected with an envelope detector
and decimated to a frequency of 38 kHz. The response
time of the detector is 100 µs. Another option is the
high-pass 2 (HP2 or wide band noise level filter). This
output of the first MPX decimation filter is in a band from
60 to 240 kHz. It has the same properties and is also
decimated to the same 38 kHz. Which of the signals is
used (HP1 or HP2) is determined by the I2C-bus
bit sel_nsdec.
MGT468
handbook, full pagewidth
0
α
(dB)
(1)
−20
(2)
−40
−60
−80
−100
−120
−140
0
50
100
150
200
250
f (kHz)
300
(1) Noise with wide band digital filter.
(2) Noise with small band digital filter.
Fig.12 Frequency response of noise level before decimation.
8.4.2
MONO OR STEREO SWITCHING
8.4.3
The VCO of the DCS block will be at 19 kHz ±2 Hz exact
based in the event of no-pilot FM_MPX reception or in the
event of only RDS reception. In the event of stereo
reception the phase error is zero for a pilot tone with a
frequency of exactly 19 kHz.
The DCS block uses a sample rate converter to derive
from the XTAL clock, via a PLL, a 512 multiple of 19 kHz
(9.728 MHz). In the event of mono reception the DCS
circuit generates a preset frequency of n × 19 kHz ±2 Hz.
In the event of stereo reception the frequency is exactly
n × 19 kHz (DCS locked to N × pilot tone). The detection of
the pilot and the stereo indication is done in the DSP
program.
2001 Mar 05
THE AUTOMATIC LOCK SYSTEM
20
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.5
The characteristics of both IAC detectors can be adapted
to the properties of different FM front-ends by means of the
predefined coefficients in the IAC control registers. The
values can be changed via the I2C-bus. Both IAC detectors
can be switched on or off independently of each other.
Both IAC detectors can mute the MPX signal
independently of each other.
DCS clock
In radio mode the stereo decoder, the ADC3 and RDS
demodulator, the ADC1 or ADC2 and the level decimation
filters have to run synchronously to the 19 kHz pilot.
Therefore a clock signal with a controlled frequency of a
multiple of 19 kHz (9.728 MHz = 512 × 19 kHz) is needed.
In the SAA7706H the patented method of non-equidistant
digitally controlled sampling DCS clock has been
implemented. By a special dividing mechanism a
frequency of 9.728 MHz from the PLL2 clock frequency of
>40 MHz is generated. The dividing can be changed by
means of I2C-bus bits to cope with the different input
frequencies of the DCS block.
A third IAC function is the dynamic IAC circuit. This block
is intended to switch off the IAC completely the moment
the MPX signal has a too high frequency deviation which
in the event of small IF filters can result in AM modulation.
This AM modulation could be interpreted by the IAC
circuitry as interference caused by the car’s engine.
The DCS system is controlled by up or down information
from the stereo decoder. In the event of mono
transmissions or 44.1 kHz ADC1 or ADC2 usage the DCS
clock is still controlled by the stereo decoder loop. The
output keeps the DCS free running on a multiple frequency
of 19 kHz ±2 Hz if the correct clock setting is applied. In
8.7
8.6.1
The Interference Absorption Circuit (IAC)
GENERAL DESCRIPTION
The output voltage of the FSDAC scales proportionally
with the power supply voltage.
The IAC detects and suppresses ignition interference. This
hardware IAC is a modified, digitized and extended
version of the analog circuit which is in use for many years
already.
8.7.1
INTERPOLATION FILTER
The digital filter interpolates from 1 to 64fs by means of a
cascade of a recursive filter and an FIR filter.
The IAC consists of an MPX mute function switched by
mute pulses from ignition interference pulse detectors.
The input signal of a second IAC detection circuit is the
FM level signal (the output of the level-ADC). This detector
performs optimally in lower antenna voltage
circumstances. It is therefore complementary to the first
detector.
Table 2
Digital interpolation filter characteristics
ITEM
The input signal of a first IAC detection circuit is the output
signal of one of the down-sample paths coming from ADC1
or ADC2. This interference detector analyses the
high-frequency contents of the MPX signal. The
discrimination between interference pulses and other
signals is performed by a special Philips patented fuzzy
logic such as algorithm and is based on probability
calculations. This detector performs optimally in higher
antenna voltage circumstances. On detection of ignition
interference, this logic will send appropriate pulses to the
MPX mute switch.
2001 Mar 05
The Filter Stream DAC (FSDAC)
The FSDAC is a semi-digital reconstruction filter that
converts the 1-bit data stream of the noise shaper to an
analog output voltage. The filter coefficients are
implemented as current sources and are summed at
virtual ground of the output operational amplifier. In this
way very high signal-to-noise performance and low clock
jitter sensitivity is achieved. A post-filter is not needed due
to the inherent filter function of the DAC. On-board
amplifiers convert the FSDAC output current to an output
voltage signal capable of driving a line output.
tape/cd of either 38 or 44.1 kHz and AM mode the DCS
clock always has to be put in preset mode with a bit in the
I2C-bus memory map definitions.
8.6
SAA7706H
CONDITIONS
VALUE (dB)
Pass band ripple
0 − 0.45fs
±0.03
Stop band
>0.55fs
−50
Dynamic range
0 − 0.45fs
116.5
Gain
DC
−3.5
8.7.2
NOISE SHAPER
The 5th-order noise shaper operates at 64fs. It shifts
in-band quantization noise to frequencies well above the
audio band. This noise shaping technique enables high
signal-to-noise ratios to be achieved. The noise shaper
output is converted into an analog signal using a filter
stream digital-to-analog converter.
21
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.7.3
In order to obtain the lowest noise and to have the best
ripple rejection, a filter capacitor has to be added between
this pin and ground, preferably close to the analog
pin VSSA2.
FUNCTION OF PIN POM
With pin POM it is possible to switch off the reference
current of the DAC. The capacitor on pin POM determines
the time after which this current has a soft switch-on. So at
power-on the current audio signal outputs are always
muted. The loading of the external capacitor is done in two
stages via two different current sources. The loading starts
at a current level that is lower than the current loading after
the voltage on pin POM has past a particular level. This
results in an almost dB-linear behaviour. This must
prevent ‘plop’ effects during power on or off.
8.7.4
8.7.6
SUPPLY OF THE FILTER STREAM DAC
The entire analog circuitry of the DACs and the operational
amplifiers are supplied by 2 supply pins: VDDA2 and VSSA2.
VDDA2 must have sufficient decoupling to prevent total
harmonic distortion degradation and to ensure a good
power supply rejection ratio. The digital part of the DAC is
fully supplied from the chip core supply.
POWER-OFF PLOP SUPPRESSION
8.8
To avoid plops in a power amplifier, the supply voltage of
the analog part of the DAC and the rest of the chip can be
fed from a separate power supply of 3.3 V. A capacitor
connected to this power supply enables to provide power
to the analog part at the moment the digital voltage is
switching off fast. In this event the output voltage will
decrease gradually allowing the power amplifier some
extra time to switch off without audible plops.
8.7.5
SAA7706H
Clock circuit and oscillator
The chip has an on-chip crystal clock oscillator. The block
diagram of this Pierce oscillator is shown in Fig.13. The
active element needed to compensate for the loss
resistance of the crystal is the block Gm. This block is
placed between the external pins OSC_IN
and OSC_OUT. The gain of the oscillator is internally
controlled by the AGC block. A sine wave with a
peak-to-peak voltage close to the oscillator power supply
voltage is generated. The AGC block prevents clipping of
the sine wave and therefore the higher harmonics are as
low as possible. At the same time the voltage of the sine
wave is as high as possible which reduces the jitter going
from sine wave to the clock signal.
PIN VREFDA FOR INTERNAL REFERENCE
With two internal resistors half the supply voltage VDDA2 is
obtained and used as an internal reference. This reference
voltage is used as DC voltage for the output operational
amplifiers and as reference for the DAC.
handbook, full pagewidth
0.5VDD(OSC)
Gm
AGC
clock to circuit
Rbias
on-chip
63
64
65
62
OSC_IN
OSC_OUT
VDD(OSC)
VSS(OSC)
off-chip
C2
C1
MGT469
Fig.13 Block diagram oscillator circuit.
2001 Mar 05
22
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
handbook, full pagewidth
SAA7706H
0.5VDD(OSC)
Gm
AGC
clock to circuit
Rbias
on-chip
63
64
65
62
OSC_IN
OSC_OUT
VDD(OSC)
VSS(OSC)
off-chip
C3
C2
C1
MGT470
slave input 3.3 V(p-p)
Fig.14 Block diagram of the oscillator in slave mode.
8.8.1
• Although a multiple of the frequency of the used crystal
of 11.2896 MHz falls within the FM reception band, this
will not disturb the reception because the relatively low
frequency crystal is driven in a controlled way and the
sine wave of the crystal has in the FM reception band
only very minor harmonics.
SUPPLY OF THE CRYSTAL OSCILLATOR
The power supply connections of the oscillator are
separated from the other supply lines. This is done to
minimize the feedback from the ground bounce of the chip
to the oscillator circuit. Pin VSS(OSC) is used as ground
supply and pin VDD(OSC) as positive supply. A series
resistor plus capacitance is required for proper operating
on pin VDD(OSC), see Figs 25 and 26. See also important
remark in Section 8.10.
8.9
8.10
The supply voltage on pins VDDD3V1 to VDDD3V4 must be
for at least 10 ms earlier active than the supply voltage
applied to pin VDD(OSC).
The phase-locked loop circuit to generate the
DSPs and other clocks
8.11
There are several reasons why a PLL circuit is used to
generate the clock for the DSPs:
CL_GEN, audio clock recovery block
When an external I2S-bus or SPDIF source is connected,
the FSDAC circuitry needs an 256fs related clock. This
clock is recovered from either the incoming WS of the
digital serial input or the WS derived from the
SPDIF1/SPDIF2 input. There is also a possibility to
provide the chip with an external clock, in that case it must
be a 256fs clock with a fixed phase relation to the source.
• The PLL makes it possible to switch in the rare cases
that tuning on a multiple of the DSP clock frequency
occurs to a slightly higher frequency for the clock of the
DSP. In this way an undisturbed reception with respect
to the DSP clock frequency is possible.
• Crystals for the crystal oscillator in the range of twice the
required DSP clock frequency, so approximately
100 MHz, are always third overtone crystals and must
also be manufactured on customer demand. This makes
these crystals expensive. The PLL1 enables the use of
a crystal running in the fundamental mode and also a
general available crystal can be chosen. For this circuit
a 256 × 44.1 kHz = 11.2896 MHz crystal is chosen. This
type of crystal is widely used.
2001 Mar 05
Supply of the digital part (VDDD3V1 to VDDD3V4)
23
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.12
8.12.1
External control pins
8.13
DSP1
SAA7706H
I2C-bus control (pins SCL and SDA)
General information about the I2C-bus can be found in
“The I2C-bus and how to use it”. This document can be
ordered using the code 9398 393 40011. For the external
control of the SAA7706H device a fast I2C-bus is
implemented. This is a 400 kHz bus which is
downward-compatible with the standard 100 kHz bus.
There are two different types of control instructions:
For external control two input pins have been
implemented. The status of these pins can be changed by
applying a logic level. The status is saved in the DSP1
status register. The function of each pin depends on the
DSP1 program.
To control external devices two output pins are
implemented. The status of these pins is controlled by the
DSP program.
• Instructions to control the DSP program, programming
the coefficient RAM and reading the values of
parameters (level, multipath etc.)
Function of these ‘control pins’ can be found in a separate
manual and is rom_code dependent.
• Instructions controlling the data flow; such as source
selection, IAC control and clock speed.
8.12.2
The detailed description of the I2C-bus and the description
of the different bits in the memory map is given in
Chapter 9.
DSP2
For external control four configurable I/O pins have been
implemented. Via the I2C-bus these four pins can be
independently configured as input or output. The status of
these pins can be changed by applying a logic level (input
mode). The status is saved in the DSP2 status register.
The function of each pin depends on the I2C-bus setting
and DSP2 program.
Function of these ‘control pins’ can be found in a separate
manual and is rom_code dependent.
2001 Mar 05
24
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.14
8.14.1
This chip does not handle the user data bits, channel
status bits and validity bits of the SPDIF stream, but only
the audio is given at its outputs. Some rom_codes do take
care of the pre-emphasis bit of the SPDIF stream.
Digital serial inputs/outputs and SPDIF inputs
GENERAL DESCRIPTION DIGITAL SERIAL AUDIO
INPUTS/OUTPUTS
For communication with external digital sources a digital
serial bus is implemented. It is a serial 3-line bus, having
one line for data, one line for clock and one line for the
word select. For external digital sources the SAA7706H
acts as a slave, so the external source is master and
supplies the clock.
The bits in the audio space are always decoded regardless
of any status bits e.g. ‘copy protected’, ‘professional mode’
or ‘data mode’. The DAC is not muted in the event of a
non-linear PCM audio, however the bit is observable via
the I2C-bus. A few other channel status bits are available.
There are 5 control signals available from the SPDIF input
stage. These are connected to flags of DSP2. For more
details see separate manual.
The digital serial input is capable of handling multiple input
formats. The input is capable of handling Philips I2S-bus
and LSB-justified formats of 16, 18, 20 and 24 bits word
sizes. The sampling frequency can be either
44.1 or 48 kHz. See Fig.15 for the general waveform
formats of all possible formats.
These 5 control signals are:
• Signals to indicate the sample frequency of the SPDIF
signal: 44.1 and 48 kHz (32 kHz is not supported)
• A lock signal indicating if the SPDIF input is in lock
The number of bit clock (BCK) pulses may vary in the
application. When the applied word length is smaller than
24 bits (internal resolution of DSP2), the LSB bits will get
internally a zero value; when the applied word length
exceeds 24 bits then the LSBs are skipped.
• The pre-emphasis bit of the SPDIF audio stream
• The pcm_audio/non-pcm_audio bit indicating if an audio
or data stream is detected. The FSDAC output will not
be muted in the event of a non-audio PCM stream. This
status bit can be read via the I2C-bus, the
microcontroller can decide to mute the DAC (via
pin POM).
It should be noted that:
• Two digital sources can not be used at the same time
• Maximum number of bit clocks per word select (WS) is
limited to 64
The design fulfils the digital audio interface specification
“IEC 60958-1 Ed2, part 1, general part IEC 60958-3 Ed2,
part 3, consumer applications”.
• The word select (WS) must have a duty cycle of 50%.
8.14.2
It should be noted that:
GENERAL DESCRIPTION SPDIF INPUTS (SPDIF1
AND SPDIF2)
• The SPDIF input may only be used in the ‘consumer
mode’ specified in the digital audio interface
specification
For communication with external digital sources also an
SPDIF input can be used. The two SPDIF input pins can
be connected via an analog multiplexer to the SPDIF
receiver. It is a receiver without an analog PLL that
samples the incoming SPDIF with a high frequency. In this
way the data is recovered synchronously on the applied
system clock.
• Only one of the two SPDIF sources can be used
(selected) at the same time
• The FSDAC will not (automatically) be muted in the
event of a non-audio stream
• Two digital sources can not be used at the same time
From the SPDIF signal a three wire serial bus
(e.g. I2S-bus) is made, consisting of a word select, data
and bit clock line. The sample frequency fs depends solely
on the SPDIF signal input accuracy and both 44.1 and
48 kHz are supported.
2001 Mar 05
SAA7706H
• Supported sample frequencies are 44.1 and 48 kHz.
25
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3
DATA
MSB
B2
MSB
B2
>=8
MSB
INPUT FORMAT I2S-BUS
WS
LEFT
RIGHT
16
15
1
16
B15 LSB
MSB
2
15
2
1
BCK
DATA
MSB
B2
B2
B15 LSB
LSB-JUSTIFIED FORMAT 16 BITS
WS
LEFT
RIGHT
18
17
16
15
1
18
B17 LSB
MSB
2
17
16
15
2
1
BCK
26
DATA
MSB
B2
B3
B4
B2
B3
B4
B17 LSB
Philips Semiconductors
2
1
Car radio Digital Signal Processor (DSP)
>=8
3
DIGITAL DATA STREAM FORMATS
2
8.14.3
1
BCK
handbook, full pagewidth
2001 Mar 05
RIGHT
LEFT
WS
LSB-JUSTIFIED FORMAT 18 BITS
WS
LEFT
20
RIGHT
19
18
17
16
15
1
20
B19 LSB
MSB
2
19
18
17
16
15
2
1
BCK
DATA
MSB
B2
B3
B4
B5
B6
B2
B3
B4
B5
B6
B19 LSB
LSB-JUSTIFIED FORMAT 20 BITS
WS
LEFT
24
23
22
21
20
RIGHT
19
18
17
16
15
2
24
B23 LSB
MSB
23
22
21
20
19
18
17
16
15
2
1
BCK
MSB
B2
B3
B4
B5
B6
B7
B8
B9
B10
B2
B3
B4
B5
B6
B7
B8
B9
B10
B23 LSB
MGR751
LSB-JUSTIFIED FORMAT 24 BITS
Fig.15 All serial data input/output formats.
SAA7706H
DATA
Product specification
1
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
8.15
RDS demodulator (pins RDS_CLOCK
and RDS_DATA)
8.15.1
SAA7706H
CLOCK AND DATA RECOVERY
The RDS-chain has a separate input. This enables RDS
updates during tape play and also the use of a second
receiver for monitoring the RDS information of signals from
an other transmitter (double tuner concept). It can as such
be done without interruption of the audio program. The
MPX signal from the main tuner of the car radio can be
connected to this RDS input via the built-in source
selector. The input selection is controlled by an I2C-bus bit.
The RDS demodulator recovers the additional inaudible
RDS information which is transmitted by FM radio
broadcasting. The (buffered) data is provided as output for
further processing by a suitable decoder. The operational
functions of the decoder are in accordance with the EBU
specification ”EN 50067”.
The RDS demodulator has three different functions:
The RDS chain contains a sigma-delta ADC (ADC3),
followed by two decimation filters. The first filter passes the
multiplex band including the signals around 57 kHz and
reduces the sigma-delta noise. The second filter reduces
the RDS bandwidth around 57 kHz. The overall filter curve
is shown in Fig.16 and a more detailed curve of the RDS
57 kHz band in Fig.17.
• Clock and data recovery from the MPX signal
• Buffering of 16 bits, if selected
• Interfacing with the microcontroller.
MGT471
0
handbook, full pagewidth
α
(dB)
−20
−40
−60
−80
−100
0
19
38
57
76
95
114
Fig.16 Overall frequency response curve decimation filters.
2001 Mar 05
27
133
f (kHz)
152
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
α
SAA7706H
MGT472
10
handbook, full pagewidth
(dB)
0
−10
−20
−30
−40
−50
−60
−70
50
52
54
56
58
60
62
f (kHz)
64
Fig.17 Detailed frequency response curve RDS channel.
The quadrature mixer converts the RDS band to the
frequency spectrum around 0 Hz and contains the
appropriate Q/I signal filters. The final decoder with
CORDIC recovers the clock and data signals. These
signals are output on pins RDS_CLOCK and RDS_DATA.
In the event of FM-stereo reception the clock of the total
chip is locked to the stereo pilot (19 kHz multiple). In the
event of FM-mono the DCS loop keeps the DCS clock
around the same 19 kHz multiple. In all other cases like
AM reception or tape, the DCS circuit has to be set in a
preset position by means of an I2C-bus bit. Under these
conditions the RDS system is always clocked by the DCS
clock in a 38 kHz (4 × 9.5 kHz) based sequence.
2001 Mar 05
8.15.2
TIMING OF CLOCK AND DATA SIGNALS
The timing of the clock and data output is derived from the
incoming data signal. Under stable conditions the data will
remain valid for 400 µs after the clock transition. The
timing of the data change is 100 µs before a positive clock
change. This timing is suited for positive as well as
negative triggered interrupts on a microcontroller. The
RDS timing is shown in Fig.18. During poor reception it is
possible that faults in phase occur, then the duty cycle of
the clock and data signals will vary from minimum
0.5 times to a maximum of 1.5 times the standard clock
periods. Normally, faults in phase do not occur on a cyclic
basis.
28
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
RDS_DATA
RDS_CLOCK
tsu
tHC
Tcy
tLC
th
MGU270
Fig.18 RDS timing in the direct output mode.
8.15.3
BUFFERING OF RDS DATA
In Fig.19 the interface signals from the RDS decoder and
the microcontroller in buffer mode are shown. When the
buffer is filled with 16 bits the data line is pulled down. The
data line will remain LOW until reading of the buffer is
started by pulling down the clock line. The first bit is
clocked out. After 16 clock pulses the reading of the buffer
is ready and the data line is set HIGH until the buffer is
filled again. The microcontroller stops communication by
pulling the line HIGH. The data is written out just after the
clock HIGH-to-LOW transition. The data is valid when the
clock is HIGH. When a new 16-bit buffer is filled before the
other buffer is read, that buffer will be overwritten and the
old data is lost.
The repetition of the RDS data is around the 1187 Hz. This
results in an interrupt on the microcontroller for every
842 µs. In a second mode, the RDS interface has a double
16-bit buffer.
8.15.4
BUFFER INTERFACE
The RDS interface buffers 16 data bits. Every time 16 bits
are received, the data line is pulled down and the buffer is
overwritten. The microcontroller has to monitor the data
line in at most every 13.5 ms. This mode can be selected
via an I2C-bus.
2001 Mar 05
29
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
RDS_DATA
D0
D1
D2
D13
D14
D15
tLC
RDS_CLOCK
tHC
tw
block ready
MGU271
Tcy
start reading data
Fig.19 Interface signals RDS decoder and microcontroller (buffer mode).
8.16
• The program counter of both DSPs are set to
address 0000H
DSP reset
Pin DSP_RESET is active LOW and requires an external
pull-up resistor. Between this pin and the VSSD ground a
capacitor should be connected to allow a proper switch-on
of the supply voltage. The capacitor value is such that the
chip is in reset as long as the power supply is not
stabilized. A more or less fixed relationship between the
DSP_RESET (pin) and the POM (pin) time constant is
mandatory.
• The two output flags of DSP1 (DSP1_OUT1 and
DSP1_OUT2) are reset to logic 0. All the configurable
flags of DSP2 are reset to logic 0, however the four flags
available at the output of the chip are default configured
as input flags (DSP2_INOUT1, DSP2_INOUT2,
DSP2_INOUT3 and DSP2_INOUT4).
When the level on pin DSP_RESET is at HIGH, the DSP
program (DSP1 and DSP2) starts to run.
The voltage on pin POM determines the current flowing in
the DACs. At 0 V on pin POM the DAC currents are zero
and so are the DAC output voltages.
8.17
At the VDDA2 voltage the DAC currents are at their nominal
(maximal) value. Long before the DAC outputs get to their
nominal output voltages, the DSP must be in working
mode to reset the output register: therefore the DSP time
constant must be shorter than the POM time constant. For
recommended capacitors see Figs 25 and 26.
Pins TSCAN, RTCB and SHTCB are used to put the chip
in test mode and to test the internal connections. Each pin
has an internal pull-down resistor to ground. In the
application these pins can be left open or connected to
ground.
The reset has the following function:
• All I2C-bus bits are set to their default value
• The DSP status registers (DSP1 and DSP2) are reset
2001 Mar 05
Test mode connections (pins TSCAN, RTCB
and SHTCB)
30
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
Then the master writes the high memory address and low
memory address where the reading of the memory content
of the SAA7706H must start. The SAA7706H
acknowledges these addresses both. Then the master
generates a repeated START (Sr) and again the
SAA7706H address ‘0011100’ but this time followed by a
logic 1 (read) of the R/W bit.
I2C-BUS FORMAT
9
For more general information on the I2C-bus protocol, see
the Philips I2C-bus specification.
9.1
Addressing
Before any data is transmitted on the I2C-bus, the device
which should respond is addressed first. The addressing is
always done with the first byte transmitted after the start
procedure.
9.2
From this moment on the SAA7706H will send the memory
content in groups of 2 (Y-memory DSP1) or 3 (X-memory
DSP1, X/Y-memory DSP2 or registers) bytes to the
I2C-bus each time acknowledged by the master. The
master stops this cycle by generating a negative
acknowledge, then the SAA7706H frees the I2C-bus and
the master can generate a STOP condition. The data is
transferred from the DSP register to the I2C-bus register at
execution of the MPI instruction in the DSP2 program.
Therefore at least once every DSP routine an MPI
instruction should be added. The data length of 4 bytes is
not used in the SAA7706H.
Slave address (pin A0)
The SAA7706H acts as slave receiver or a slave
transmitter. Therefore the clock signal SCL is only an input
signal. The data signal SDA is a bidirectional line. The
SAA7706H slave address is shown in Table 3.
Table 3
Slave address
MSB
0
LSB
0
1
1
1
0
A0
9.5
R/W
Write cycles
The I2C-bus configuration for a write cycle is shown in
Fig.20. The write cycle is used to write the bytes to both
DSP1 and DSP2 for manipulating the data and
coefficients. Depending on which DSP is accessed the
data protocol exists out of 2, 3 or 4 bytes. More details can
be found in the I2C-bus memory map (see Table 5).
9.5.1
The second block has an address space of 16 addresses
and are all X-memory mapped on DSP2. While this space
is 24 bits wide 3 bytes should be sent to or read from.
These addresses are DSP2 mapped which means an MPI
instruction is needed for accessing those locations and
there is no verifying mechanism if all addresses are really
mapped to physical registers. Therefore, all those
locations will be acknowledged even if the data is not valid.
For the SAA7706H several registers are located in this
section. A few registers are predefined for DSP2 purposes
(see Table 5).
Read cycles
I2C-bus
The
configuration for a READ cycle is shown in
Fig.21. The read cycle is used to read the data values from
XRAM or YRAM of both DSPs. The master starts with a
START condition S, the SAA7706H address ‘0011100’
and a logic 0 (write) for the R/W bit. This is followed by an
acknowledge of the SAA7706H.
2001 Mar 05
SAA7706H DSPS REGISTERS
The hardware registers have two different address blocks.
One block exists out of hardware register locations which
control both DSPs and some major settings such as the
PLL division. These locations have a maximum of 16 bits,
which means 2 bytes need to be sent to or read from. For
the SAA7706H one register is located at the DSPs and
general control register (0FFFH).
The data length is 2, 3 or 4 bytes depending on the
accessed memory. If the Y-memory of DSP1 is addressed
the data length is 2 bytes, in the event of the X-memory of
DSP1 or X/Y-memory of DSP2 the length is 3 bytes. The
slave receiver detects the address and adjusts the number
of bytes accordingly. The data length of 4 bytes is not used
in the SAA7706H.
9.4
SAA7706H hardware registers
The write cycle can be used to write the bytes to the
hardware registers to control the DCS block, the PLL for
the DSP clock generation, the IAC settings, the AD volume
control settings, the analog input selection, the format of
the I2S-bus and some other settings. It is also possible to
read these locations for chip status information. More
detail can be found in the I2C-bus memory map,
Tables 4 and 5.
The sub-address bit A0 corresponds to the hardware
address pin A0 which allows the device to have 2 different
addresses. The A0 input is also used in test mode as a
serial input of the test control block.
9.3
SAA7706H
31
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K
ADDR L
A
C
K
DATA H
A
C
K
DATA M
A
C
K
DATA L
A
C P
K
auto increment if repeated n-groups of 3 (2) bytes
address
MGD568
R/W
S = START condition
P = STOP condition
ACK = acknowledge from SAA7706H
ADDR H and ADDR L = address DSP register
DATA 1, DATA 2, DATA3 and DATA 4 = 2, 3 or 4 bytes data word.
Fig.20 Master transmitter writes to the SAA7706H registers.
32
A
S 0 0 1 1 1 0 0 0 C
K
ADDR H
A
C
K
ADDR L
A
A
C S 0 0 1 1 1 0 0 1 C
K
K
DATA H
A
C
K
DATA M
A
C
K
DATA L
Philips Semiconductors
ADDR H
Car radio Digital Signal Processor (DSP)
2001 Mar 05
A
C
K
A
S 0 0 1 1 1 0 0 0 C
A
C P
K
auto increment if repeated n-groups of 3 (2) bytes
address
R/W
R/W
Product specification
Fig.21 Master transmitter reads from the SAA7706H registers.
SAA7706H
S = START condition
Sr = repeated START condition
P = STOP condition
ACK = acknowledge from SAA7706H (SDA LOW)
R = repeat n-times the 2, 3 or 4 bytes data group
NA = negative acknowledge master (SDA HIGH)
ADDR H and ADDR L = address DSP register
DATA 1, DATA 2, DATA 3 and DATA 4 = 2, 3 or 4 bytes data word.
MGA808 - 1
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
9.6
SAA7706H
I2C-bus memory map specification
The I2C-bus memory map contains all defined I2C-bus bits. The map is split up in two different sections, the hardware
memory registers and the RAM definitions. In Table 5 the preliminary memory map is depicted. The hardware registers
are memory map on the XRAM of DSP2. Table 5 shows the detailed memory map of those locations. All locations are
acknowledged by the SAA7706H even if the user tries to write to a reserved space. The data in these sections will be
lost. Reading from this locations will result in undefined data words.
Table 4
I2C-bus memory map
ADDRESS
FUNCTION
SIZE
512 × 12 bits
2000H to 21FFH
YRAM (DSP2)
1FF0H to 1FFFH
hardware registers
16 × 24 bits
1000H to 127FH
XRAM (DSP2)
640 × 24 bits
0FFFH
DSP CONTROL
1 × 16 bits
0800H to 097FH
YRAM (DSP1)
384 × 12 bits
0000H to 017FH
XRAM (DSP1)
384 × 18 bits
Table 5
I2C-bus memory map overview of hardware registers
DESCRIPTION
REGISTER
Hardware registers
Program counter register DSP2
1FFFH
Status register DSP2
1FFEH
I/O configuration register DSP2
1FFDH
Phone, navigation and audio register
1FFCH
FM and RDS sensitivity register
1FFBH
Clock coefficient register
1FFAH
Clock settings register
1FF9H
IAC settings register
1FF8H
Selector register
1FF7H
CL_GEN register 4
1FF6H
CL_GEN register 3
1FF5H
CL_GEN register 2
1FF4H
CL_GEN register 1
1FF3H
Evaluation register
1FF0H
DSP control
DSPs and general control register
2001 Mar 05
0FFFH
33
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
10 LIMITING VALUES
In accordance with the Absolute Maximum Ratings System (IEC 60134).
SYMBOL
PARAMETER
CONDITIONS
MIN.
MAX.
UNIT
VDD
supply voltage
−0.5
+3.6
V
Vn
input voltage on any pin
−0.5
+5.5
V
IIK
DC input clamping diode current
VI < −0.5 V or VI > VDD + 0.5 V
−
±10
mA
IOK
DC output clamping diode
current
VO < −0.5 V or VO > VDD + 0.5 V
−
±20
mA
IO(sink/source)
DC output source or sink current −0.5 V < VO < VDD + 0.5 V
−
±20
mA
IDD,ISS
supply current per supply pin
−
±50
mA
Tamb
ambient operating temperature
−40
+85
°C
Tstg
storage temperature range
−65
+125
°C
VESD
ESD voltage
human body model
100 pF; 1500 Ω
2000
−
V
machine model
200 pF; 0.5 µH; 10 Ω
200
−
V
CIC spec/test method
100
−
mA
−
890
mW
Ilu(prot)
latch-up protection current
Ptot
total power dissipation
11 THERMAL CHARACTERISTICS
SYMBOL
Rth(j-a)
PARAMETER
CONDITIONS
VALUE
UNIT
thermal resistance from junction to ambient
mounted on printed-circuit board
45
K/W
MAX.
UNIT
12 CHARACTERISTICS
VDD = 3 to 3.6 V; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
Supplies; Tamb = −40 to +85 °C
VDD
operating supply voltage
all VDD pins with respect to
VSS
3.0
3.3
3.6
V
IDDD
supply current of the
digital part
DSP1 at 50 MHz; DSP2 at
62.9 MHz
−
110
150
mA
IDDD(core)
supply current of the
digital core part
DSP1 at 50 MHz; DSP2 at
62.9 MHz
−
105
140
mA
IDDD(peri)
supply current of the
digital periphery part
without external load to
ground
−
5
10
mA
IDDA
supply current of the
analog part
zero input and output signal
−
40
60
mA
IDDA(ADC)
supply current of the
ADCs
zero input and output signal
−
15
26
mA
IDDA(DAC)
supply current of the
DACs
zero input and output signal
−
19
30
mA
IDDA(osc)
supply current XTAL
oscillator
functional mode
−
2
4
mA
2001 Mar 05
34
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
Ptot
PARAMETER
total power dissipation
SAA7706H
CONDITIONS
DSP1 at 50 MHz, DSP2 at
62.9 MHz
MIN.
TYP.
MAX.
UNIT
−
540
750
mW
Digital I/O; Tamb = −40 to +85 °C; VDD = 3 to 3.6 V
VIH
HIGH-level input voltage
for all digital inputs and
I/Os
2.0
−
−
V
VIL
LOW-level input voltage
for all digital inputs and
I/Os
−
−
0.8
V
Vhys
Schmitt trigger hysteresis
voltage
0.4
−
−
V
VOH
HIGH-level output voltage
standard output; IO = −4 mA
VDD − 0.4
−
−
V
5 ns slew rate output;
IO = −4 mA
VDD − 0.4
−
−
V
10 ns slew rate output;
IO = −2 mA
VDD − 0.4
−
−
V
20 ns slew rate output;
IO = −1 mA
VDD − 0.4
−
−
V
standard output; IO = 4 mA
−
−
0.4
V
5 ns slew rate output;
IO = 4mA
−
−
0.4
V
10 ns slew rate output;
IO = 2 mA
−
−
0.4
V
20 ns slew rate output;
IO = 1 mA
−
−
0.4
V
I2C-bus output; IO = 4 mA
−
−
0.4
V
VO = 0 V or VDD
−
−
±5
µA
VOL
LOW-level output voltage
ILO
output leakage current
3-state outputs
Rpd
internal pull-down resistor
to VSS
24
50
140
kΩ
Rpu
internal pull-up resistor to
VDD
30
50
100
kΩ
Ci
input capacitance
−
−
3.5
pF
ti(r),ti(f)
input rise and fall times
VDD = 3.6 V
−
6
200
ns
to(t)
output transition time
standard output; CL = 30 pF
−
3.5
−
ns
5 ns slew rate output;
CL = 30 pF
−
5
−
ns
10 ns slew rate output;
CL = 30 pF
−
10
−
ns
20 ns slew rate output;
CL = 30 pF
−
20
−
ns
I2C-bus output; Cb = 400 pF
60
−
300
ns
2001 Mar 05
35
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
PARAMETER
SAA7706H
CONDITIONS
MIN.
TYP.
MAX.
UNIT
Analog inputs; Tamb = 25 °C; VDDA1 = 3.3 V
DC CHARACTERISTICS
V VREFAD
---------------------V VDDA1
common mode reference
voltage ADC1, ADC2 and
level-ADC
Zo(VREFAD)
with reference to VSSA1
0.47
0.50
0.53
output impedance at
pin VREFAD
−
10
−
Ω
VVDACP
positive reference voltage
ADC1, 2, 3 and level-ADC
3
3.3
3.6
V
IVDACP
positive reference current
ADC1, 2, 3 and level-ADC
−
−200
−
µA
VVDACN1,
VVDACN2
negative reference
voltage ADC1, 2, 3 and
level-ADC
−0.3
0
+0.3
V
IVDACN1,
IVDACN2
negative reference current
ADC1, 2 and 3
−
200
−
µA
VIO(ADC)
input offset voltage
ADC1, 2 and 3
−
140
−
mV
AC CHARACTERISTICS
Vi(con)(max)(rms)
Ri
THD
2001 Mar 05
maximum conversion
input level (RMS value)
CD, TAPE, AM and
AUX input signals
THD <1%
0.6
0.66
−
V
FM_MPX input signal
THD <1%; VOLFM = 00H
0.33
0.368
−
V
CD, TAPE, AM and
AUX input signals
1
−
−
MΩ
FM_MPX input signal
48
60
72
kΩ
input impedance
total harmonic distortion
CD, TAPE, AM and
AUX input signals
input signal 0.55 V (RMS) at
1 kHz; bandwidth = 20 kHz;
fs = 44.1 kHz
−
−85
−75
dB
FM_MPX input signal
input signal 368 mV (RMS) at −
1 kHz; bandwidth = 19 kHz;
−
VOLFM = 00H
−70
−65
dB
0.03
0.056
%
36
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
S/N
α19
α38
PARAMETER
SAA7706H
CONDITIONS
MIN.
TYP.
MAX.
UNIT
signal-to-noise ratio
CD, TAPE, AM and
AUX input signals
input signal at 1 kHz;
bandwidth = 20 kHz;
0 dB reference = 0.55 V
(RMS); fs = 44.1 kHz
85
90
−
dB
FM_MPX input signal
mono
input signal at 1 kHz;
bandwidth = 19 kHz;
0 dB reference = 0.368 V
(RMS); VOLFM = 00H
80
83
−
dB
FM_MPX input signal
stereo
input signal at 1 kHz;
bandwidth = 40 kHz;
0 dB reference = 0.368 V
(RMS); VOLFM = 00H
75
81
−
dB
pilot signal
frequency = 19 kHz
−
81
−
dB
unmodulated
−
98
−
dB
subcarrier
frequency = 38 kHz
−
83
−
dB
unmodulated
−
91
−
dB
carrier and harmonic
suppression at the output
carrier and harmonic
suppression at the output
α57
carrier and harmonic
suppression for 19 kHz,
including notch
subcarrier
frequency = 57 kHz
−
83
−
dB
unmodulated
−
96
−
dB
α76
carrier and harmonic
suppression for 19 kHz,
including notch
subcarrier
frequency = 76 kHz
−
84
−
dB
unmodulated
−
94
−
dB
IMα10
intermodulation
fmod = 10 kHz; fspur = 1 kHz
77
−
−
dB
IMα13
intermodulation
fmod = 13 kHz; fspur = 1 kHz
76
−
−
dB
α57(VF)
traffic radio suppression
f = 57 kHz
−
110
−
dB
α67(SCA)
Subsidiary
Communication
Authority (SCA)
suppression
f = 67 kHz
−
110
−
dB
α114
adjacent channel
suppression
f = 114 kHz
−
110
−
dB
α190
adjacent channel
suppression
f = 190 kHz
−
110
−
dB
Vth(pilot)(rms)
pilot threshold voltage
(RMS value) at
pin DSP1_OUT1
stereo on; VOLFM = 07H
−
35.5
−
mV
stereo off; VOLFM = 07H
−
35.4
−
mV
−
0
−
dB
fi = 1 kHz
40
45
−
dB
fi = 10 kHz
25
30
−
dB
60
70
−
dB
hys
hysteresis of Vth(pilot)(rms)
αcs1
channel separation
FM-stereo input
αcs2
2001 Mar 05
channel separation CD,
TAPE, AM and AUX input
signals
37
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
fres
PARAMETER
SAA7706H
CONDITIONS
MIN.
TYP.
MAX.
UNIT
audio frequency response
CD, TAPE, AM and
AUX input signals
fs = 44.1 kHz; at −3 dB
20
−
−
kHz
FM_MPX input signal
at −3 dB via DSP at DAC
output
17
−
−
kHz
−
−
0.5
dB
fi = 1 kHz
65
−
−
dB
fi = 15 kHz
50
−
−
dB
∆GL-R
overall left/right gain
unbalance (TAPE, CD,
AUX and AM input
signals)
αct
crosstalk between inputs
PSRRMPX/RDS
power supply ripple
rejection MPX and RDS
ADCs
output via
ADC input 35
short-circuited; fripple = 1 kHz;
Vripple = 100 mV (peak);
CVREFAD = 22 µF;
CVDACP = 10 µF
45
−
dB
PSRRLAD
power supply ripple
rejection level-ADC
output via DAC; ADC input
29
short-circuited; fripple = 1 kHz;
Vripple = 100 mV (peak);
CVREFAD = 22 µF
39
−
dB
CMRRCD
common-mode rejection
ratio for CD input mode
RCD_(L)_GND = 1 MΩ;
resistance of CD player
ground cable < 1 kΩ;
fi = 1 kHz
60
−
−
dB
I2S-bus;
AC characteristics PHONE and NAV inputs; Tamb = 25 °C; VDDA1 = 3.3 V
THD
total harmonic distortion
of PHONE and NAV input
signals at maximum input
voltage
Vi = 0.75 V (RMS); fi = 1 kHz; 40
VOLMIX = 30H; measured at
FLV and FRV outputs
−
−
dB
CMRR
common mode rejection
ratio of PHONE and NAV
input signals
Vi = 0.75 V(RMS); fi = 1 kHz; 25
VOLMIX = 30H
50
−
dB
Ri
input impedance of
PHONE, NAV/AM_L and
AM_R input signals
90
120
150
kΩ
Vi(max)(rms)
maximum input level of
PHONE and NAV input
signals (RMS value)
0.75
1
−
V
fi = 1 kHz; VOLMIX = 30H
AC characteristics FM_RDS input; Tamb = 25 °C; VDDA1 = 3.3 V
Vi(con)(max)(rms)
maximum conversion level THD < 1%; VOLRDS = 00H
of FM_RDS input
(RMS value)
0.33
0.368
−
V
Ri(FM_RDS)
input resistance FM_RDS
input
40
60
72
kΩ
THDFM_RDS
total harmonic distortion
RDS ADC
−60
−67
−
dB
2001 Mar 05
fc = 57 kHz
38
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
PARAMETER
S/NFMRDS
signal-to-noise ratio RDS
ADC
αpilot
pilot attenuation RDS
α
nearby selectivity RDS
αn(ADC)
RDS ADC noise
attenuation
Vripple(RDS)
ripple voltage RDS pass
band
αmux(RDS)
∆fosc
SAA7706H
CONDITIONS
MIN.
TYP.
MAX.
UNIT
6 kHz bandwidth; fc = 57 kHz; 54
0 dB reference = 0.55 V
(RMS); VOLRDS = 00H
−
−
dB
50
−
−
dB
61
−
−
dB
70
−
−
dB
−
−
0.5
dB
multiplex attenuation RDS mono
70
−
−
dB
stereo
40
−
−
dB
maximum crystal resonance
frequency deviation of
100 ppm
−
−
6
Hz
0.2
0.5
3.3
V
−
6
−
kΩ
−
40
−
mV
48
54
−
dB
allowable frequency
deviation of the 57 kHz
RDS
neighbouring channel at
200 kHz distance
2.4 kHz bandwidth
AC characteristics SPDIF1 and SPDIF2 inputs; Tamb = 25 °C; VDDA2 = 3.3 V
Vi(p-p)
AC input level
(peak-to-peak level)
Ri
input impedance
Vhys
hysteresis of input voltage
at 1 kHz
AC characteristics analog LEVEL input; Tamb = 25 °C; VDDA1 = 3.3 V
S/NLAD
signal-to-noise ratio of
level-ADC
0 to 29 kHz bandwidth;
maximum input level;
unweighted
Ri
input resistance
1.0
−
2.2
MΩ
Vi(fs)(LAD)
full-scale level-ADC input
voltage
0
−
VDDA1
V
VIO
DC offset voltage
−
−
120
mV
α
decimation filter
attenuation
20
−
−
fco(PB)
pass band cut-off
frequency
at −3 dB and DCS
clock = 9.728 MHz
−
29
−
kHz
fsr
sample rate frequency
after decimation
DCS clock = 9.728 MHz
−
38
−
kHz
dB
------------------decade
Analog DAC outputs on pins FLV, FRV, RLV and RRV; Tamb = 25 °C; VDDA2 = 3.3 V; fs = 44.1 kHz; RL = 5 kΩ;
fi = 1 kHz
DC CHARACTERISTICS
Ro(ref)
reference output
resistance
pin VREFDA
−
14
−
kΩ
Ro
DAC output resistance
pins FLV, FRV, RLV and RRV
−
0.13
3.0
Ω
Io(max)
maximum output current
(THD + N)/S < 0.1%;
RL = 5 kΩ
−
0.22
−
mA
RL
load resistance
3
−
−
kΩ
2001 Mar 05
39
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
CL
PARAMETER
SAA7706H
CONDITIONS
load capacitance
MIN.
TYP.
MAX.
UNIT
−
−
200
pF
AC CHARACTERISTICS
Vo(RMS)
output voltage (RMS
value)
−
1000
−
mV
∆Vo
unbalance between
channels
−
0.1
−
dB
(THD + N)/S
total harmonic
distortion-plus-noise to
signal ratio (measured
with system one)
at 0 dB
−
−90
−85
dB
at −60 dB; A-weighted
−
−37
−
dB
S/N
signal-to-noise ratio
(measured with system
one)
code = 0; A-weighted
−
105
−
dB
αcs
channel separation
PSRR
power supply rejection
ratio
−
80
−
dB
fripple = 1 kHz; Vripple(p-p) = 1% −
50
−
dB
Oscillator; Tamb = 25 °C; VDD(OSC) = 3.3 V
−
11.2896 −
MHz
1.6
2.6
V
fxtal
crystal frequency
Vxtal
voltage across the crystal
crystal series resistance
Rs < 100 Ω; crystal shunt
capacitance Cp < 7 pF;
crystal load capacitance
CL = 12 pF; C1 = C2 = 22 pF
(see Fig.13)
IDD(OSC)
supply current crystal
oscillator
at start-up
1.7
3.4
6.4
mA
at oscillation
−
0.32
−
mA
3.6
13 RDS AND I2S-BUS TIMING
Tamb = 25 °C; VDDD = 3.3 V; unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
RDS timing (see Figs 18 and 19)
fRDSCLK
nominal RDS clock frequency
tsu
clock set-up time
Tcy
cycle time
tHC
clock HIGH time
tLC
clock LOW time
th
data hold time
tw
wait time
2001 Mar 05
−
1187.5
−
Hz
direct output mode
100
−
−
µs
direct output mode
−
842
−
µs
buffer mode
2
−
−
µs
direct output mode
220
−
640
µs
buffer mode
1
−
−
µs
direct output mode
220
−
640
µs
buffer mode
1
−
−
µs
100
−
−
µs
1
−
−
µs
buffer mode
40
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SYMBOL
PARAMETER
SAA7706H
CONDITIONS
MIN.
TYP.
MAX.
UNIT
I2S-bus timing (see Fig.23)
tr
rise time
Tcy = 325 ns
−
−
0.15Tcy
ns
tf
fall time
Tcy = 325 ns
−
−
0.15Tcy
ns
Tcy
bit clock cycle time
325
−
−
ns
tBCK(H)
bit clock time HIGH
Tcy = 325 ns
0.35Tcy
−
−
ns
tBCK(L)
bit clock time LOW
Tcy = 325 ns
0.35Tcy
−
−
ns
tsu(D)
data set-up time
Tcy = 325 ns
0.2Tcy
−
−
ns
th(D)
data hold time
Tcy = 325 ns
0.2Tcy
−
−
ns
td(D)
data delay time
Tcy = 325 ns
−
−
0.15Tcy
ns
tsu(WS)
word select set-up time
Tcy = 325 ns
0.2Tcy
−
−
ns
th(WS)
word select hold time
Tcy = 325 ns
0.2Tcy
−
−
ns
LEFT
handbook, full pagewidth
WS
RIGHT
tBCK(H)
tr
tsu(WS)
tf
th(WS)
td(D)
BCK
tBCK(L)
tsu(D)
th(D)
Tcy
DATA IN
DATA OUT
LSB
MSB
LSB
MSB
MGM129
Fig.23 Input timing digital audio data inputs.
2001 Mar 05
41
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
14 I2C-BUS TIMING
Tamb = 25 °C; VDDD = 3.3 V; unless otherwise specified.
SYMBOL
PARAMETER
STANDARD MODE
I2C-BUS
CONDITIONS
MIN.
FAST MODE I2C-BUS
UNIT
MAX.
MIN.
MAX.
fSCL
SCL clock frequency
0
100
0
400
kHz
tBUF
bus free time between a
STOP and START
condition
4.7
−
1.3
−
µs
tHD;STA
hold time (repeated)
START condition. After
this period, the first clock
pulse is generated
4.0
−
0.6
−
µs
tLOW
LOW period of the SCL
clock
4.7
−
1.3
−
µs
tHIGH
HIGH period of the SCL
clock
4.0
−
0.6
−
µs
tSU;STA
set-up time for a
repeated START
condition
4.7
−
0.6
−
µs
tHD;DAT
data hold time
0
−
0
0.9
µs
tSU;DAT
data set-up time
250
−
100
−
ns
tr
rise time of both SDA
and SCL signals
Cb in pF
−
1000
20 + 0.1Cb
300
ns
tf
fall time of both SDA and Cb in pF
SCL signals
−
300
20 + 0.1Cb
300
ns
tSU;STO
set-up time for STOP
condition
4.0
−
0.6
−
µs
Cb
capacitive load for each
bus line
−
400
−
400
pF
tSP
pulse width of spikes to
be suppressed by input
filter
−
−
0
50
ns
2001 Mar 05
42
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
SDA
tLOW
tf
tSU;DAT
tr
tf
tHD;STA
tSP
tr
tBUF
SCL
S
tHD;STA
tHD;DAT
tHIGH
tSU;STA
Sr
tSU;STO
P
S
MSC610
Fig.24 Definition of timing on the I2C-bus.
15 SOFTWARE DESCRIPTION
The use and description of the software features of the SAA7706H will be described in the separate application manual.
16 APPLICATION DIAGRAM
The application diagram shown in Figs 25 and 26 must be considered as one of the examples of a (limited) application
of the chip e.g. in this case the I2S-bus inputs of the CD-input are not used. For the real application set-up the information
of the application report is necessary.
2001 Mar 05
43
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
handbook, full pagewidth
SAA7706H
VDDD
VDDA
R35
10 Ω
L2
R34
R1
C1
PHONE
C3
220 pF
R3
100 kΩ
C5
LEVEL
27 kΩ
C4
220 pF
46 36 22
VSSD3V7
VSSD3V6
VSSD3V5
VSSD3V4
VSSD3V3
VSSD3V2
VSSD3V1
VDDD3V7
VDDD3V6
VDDD3V5
76 75
VSSA1
VDACN2
74
49 50 53 54 47 37 23
NAV_GND
220 nF
LEVEL
MONO
CMRR
INPUTS
73
A
4
3
LEVEL
ADC
B
CD_L 72
8.2 kΩ
C7
47 µF
CD-GND
R5
100 kΩ
R6
1 µF
2
PHONE_GND
470 nF 15 kΩ
R4
CD-L
1
PHONE 71
470 nF 15 kΩ
C2 R2
C6
VDACP
VDACN1
VDDA1
10 Ω
C43
100 µF
C45
22 nF
C8
R7
1 µF
8.2 kΩ
R8
10 kΩ
C9
100 pF
R9
10 kΩ
C10
100
pF
CD-R
CD_(L)_GND
77
CD_R
70
CD_R_GND
14
VREFAD
78
AM_L/NAV
67
AM_R/AM
66
TAPE_L
69
TAPE_R
68
STEREO
CMRR
INPUTS
SAA7706H
R10
1 MΩ
C12
22 µF
R11
100
pF
R13
AM-R/AM
R17
TAPE-L
C18
100
pF
220 nF
56 kΩ
C20
100
pF
R37
220 nF
82 kΩ
C47
100
pF
R39
220 nF
82 kΩ
C48
100
pF
C21
27
pF
C22
R19
FM
22 kΩ
AUX_L
MONO
ADC3
7
R39
100 kΩ
AUX-R
ANALOG
SOURCE
SELECTOR
R38
100 kΩ
AUX-L
E
R18
100 kΩ
TAPE-R
STEREO
ADC2
1 µF
AUX_R
8
FM_RDS
79
FM_MPX
80
SEL_FR
61
RDS
DEMODULATOR
XTAL
OSCILLATOR
43 44 45
21
60
59 62 65
C23
100
nF
RDS
RDS
DATA CLOCK
L1
R36
10 Ω
VDDA
Fig.25 Application diagram (continued in Fig.26).
2001 Mar 05
44
63
64
OSC_OUT
56 kΩ
C19
R16
100 kΩ
OSC_IN
220 nF
100
pF
VSS(OSC)
R15
RDS_CLOCK
100 kΩ C16
C17
D
RDS_DATA
220 nF
STEREO
ADC1
TP1
100 kΩ C14
TSCAN
C15
RTCB
220 nF
C
SHTCB
C13
AM-L/NAV
VDD(OSC)
C11
47 nF
C24
18 pF
X1
11.2896
MHz
C25
18 pF
C48
47 µF
MGT473
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
handbook, full pagewidth
VDDD
VDDD
48 51 52 55
+5 V
DSP2_INOUT1
DSP2_INOUT2
R37
4.7 kΩ
DSP2_INOUT3
DSP2_INOUT4
DSP1_IN1
DSP1_IN2
DSP1_OUT1
DSP1_OUT2
VDDD3V4
VDDD3V3
VDDD3V2
VDDD3V1
DSP-FLAGS
R24
910 Ω
T1
R25
4.7 kΩ
41 40 39 38 19 18 15 17
11 VDDA2
10 VSSA2
C31
22 µF
C32
100 nF
5 POM
microcontroller
C33
22 µF
PHONE
VOLUME
A
+
SIGNAL
LEVEL
B
16 FLV
C34
10 µF
+
SAA7706H
13 FRV
C36
10 µF
FRONT-LEFT
C35
10 nF
R29
R28
100 Ω
FRONT-RIGHT
C37
10 nF
10 kΩ
QUAD
FSDAC
DSP1
9 RLV
C38
10 µF
R31
R30
100 Ω
REAR-LEFT
C39
10 nF
10 kΩ
STEREO
DECODER
IAC
R26
10 kΩ
SIGNAL
QUALITY
C
R27
100 Ω
6 RRV
DIGITAL
SOURCE
SELECTOR
D
C40
10 µF
R33
R32
100 Ω
REAR-RIGHT
C41
10 nF
10 kΩ
E
12 VREFDA
C42
4.7 µF
34 IIS_OUT1
A
DIGITAL
SOURCE
B
SELECTORS
35 IIS_OUT2
DSP2
30 IIS_CLK
DIGITAL
I/O
33 IIS_WS
31 IIS_IN1
32 IIS_IN2
I2S-BUS
I2C-BUS
SPDIF
SDA
56
42
DSP_RESET
58
A0
57
SCL
SPDIF1
24 25
SPDIF2
CD_CLK
CD_WS
29 27 28
CD_DATA
26
SYSFS
20 LOOPO
C27
SPDIF2
C26
100 pF
R20 100 nF
75 Ω
C29
R22
10 kΩ
R23
10 kΩ
+5 V
microcontroller
C30
1 µF
+5 V
SPDIF1
C28
100 pF
R21 100 nF
75 Ω
SCL SDA
MGT474
Fig.26 Application diagram (continued from Fig.25).
2001 Mar 05
45
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
17 PACKAGE OUTLINE
QFP80: plastic quad flat package; 80 leads (lead length 1.95 mm); body 14 x 20 x 2.8 mm
SOT318-2
c
y
X
64
A
41
40
65
ZE
e
E HE
A
A2
(A 3)
A1
θ
wM
pin 1 index
Lp
bp
80
L
25
detail X
24
1
wM
bp
e
ZD
v M A
D
B
HD
v M B
0
5
10 mm
scale
DIMENSIONS (mm are the original dimensions)
UNIT
A
max.
A1
A2
A3
bp
c
D (1)
E (1)
e
HD
HE
L
Lp
v
w
y
mm
3.2
0.25
0.05
2.90
2.65
0.25
0.45
0.30
0.25
0.14
20.1
19.9
14.1
13.9
0.8
24.2
23.6
18.2
17.6
1.95
1.0
0.6
0.2
0.2
0.1
Z D (1) Z E (1)
1.0
0.6
1.2
0.8
θ
o
7
0o
Note
1. Plastic or metal protrusions of 0.25 mm maximum per side are not included.
OUTLINE
VERSION
SOT318-2
2001 Mar 05
REFERENCES
IEC
JEDEC
EIAJ
EUROPEAN
PROJECTION
ISSUE DATE
97-08-01
99-12-27
MO-112
46
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
If wave soldering is used the following conditions must be
observed for optimal results:
18 SOLDERING
18.1
Introduction to soldering surface mount
packages
• Use a double-wave soldering method comprising a
turbulent wave with high upward pressure followed by a
smooth laminar wave.
This text gives a very brief insight to a complex technology.
A more in-depth account of soldering ICs can be found in
our “Data Handbook IC26; Integrated Circuit Packages”
(document order number 9398 652 90011).
• For packages with leads on two sides and a pitch (e):
– larger than or equal to 1.27 mm, the footprint
longitudinal axis is preferred to be parallel to the
transport direction of the printed-circuit board;
There is no soldering method that is ideal for all surface
mount IC packages. Wave soldering can still be used for
certain surface mount ICs, but it is not suitable for fine pitch
SMDs. In these situations reflow soldering is
recommended.
18.2
SAA7706H
– smaller than 1.27 mm, the footprint longitudinal axis
must be parallel to the transport direction of the
printed-circuit board.
The footprint must incorporate solder thieves at the
downstream end.
Reflow soldering
Reflow soldering requires solder paste (a suspension of
fine solder particles, flux and binding agent) to be applied
to the printed-circuit board by screen printing, stencilling or
pressure-syringe dispensing before package placement.
• For packages with leads on four sides, the footprint must
be placed at a 45° angle to the transport direction of the
printed-circuit board. The footprint must incorporate
solder thieves downstream and at the side corners.
Several methods exist for reflowing; for example,
convection or convection/infrared heating in a conveyor
type oven. Throughput times (preheating, soldering and
cooling) vary between 100 and 200 seconds depending
on heating method.
During placement and before soldering, the package must
be fixed with a droplet of adhesive. The adhesive can be
applied by screen printing, pin transfer or syringe
dispensing. The package can be soldered after the
adhesive is cured.
Typical dwell time is 4 seconds at 250 °C.
A mildly-activated flux will eliminate the need for removal
of corrosive residues in most applications.
Typical reflow peak temperatures range from
215 to 250 °C. The top-surface temperature of the
packages should preferable be kept below 220 °C for
thick/large packages, and below 235 °C for small/thin
packages.
18.3
18.4
Fix the component by first soldering two
diagonally-opposite end leads. Use a low voltage (24 V or
less) soldering iron applied to the flat part of the lead.
Contact time must be limited to 10 seconds at up to
300 °C.
Wave soldering
Conventional single wave soldering is not recommended
for surface mount devices (SMDs) or printed-circuit boards
with a high component density, as solder bridging and
non-wetting can present major problems.
When using a dedicated tool, all other leads can be
soldered in one operation within 2 to 5 seconds between
270 and 320 °C.
To overcome these problems the double-wave soldering
method was specifically developed.
2001 Mar 05
Manual soldering
47
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
18.5
SAA7706H
Suitability of surface mount IC packages for wave and reflow soldering methods
SOLDERING METHOD
PACKAGE
WAVE
BGA, LFBGA, SQFP, TFBGA
not suitable
suitable(2)
HBCC, HLQFP, HSQFP, HSOP, HTQFP, HTSSOP, SMS
not
PLCC(3), SO, SOJ
suitable
LQFP, QFP, TQFP
SSOP, TSSOP, VSO
REFLOW(1)
suitable
suitable
suitable
not
recommended(3)(4)
suitable
not
recommended(5)
suitable
Notes
1. All surface mount (SMD) packages are moisture sensitive. Depending upon the moisture content, the maximum
temperature (with respect to time) and body size of the package, there is a risk that internal or external package
cracks may occur due to vaporization of the moisture in them (the so called popcorn effect). For details, refer to the
Drypack information in the “Data Handbook IC26; Integrated Circuit Packages; Section: Packing Methods”.
2. These packages are not suitable for wave soldering as a solder joint between the printed-circuit board and heatsink
(at bottom version) can not be achieved, and as solder may stick to the heatsink (on top version).
3. If wave soldering is considered, then the package must be placed at a 45° angle to the solder wave direction.
The package footprint must incorporate solder thieves downstream and at the side corners.
4. Wave soldering is only suitable for LQFP, TQFP and QFP packages with a pitch (e) equal to or larger than 0.8 mm;
it is definitely not suitable for packages with a pitch (e) equal to or smaller than 0.65 mm.
5. Wave soldering is only suitable for SSOP and TSSOP packages with a pitch (e) equal to or larger than 0.65 mm; it is
definitely not suitable for packages with a pitch (e) equal to or smaller than 0.5 mm.
2001 Mar 05
48
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
SAA7706H
19 DATA SHEET STATUS
DATA SHEET STATUS
PRODUCT
STATUS
DEFINITIONS (1)
Objective specification
Development
This data sheet contains the design target or goal specifications for
product development. Specification may change in any manner without
notice.
Preliminary specification
Qualification
This data sheet contains preliminary data, and supplementary data will be
published at a later date. Philips Semiconductors reserves the right to
make changes at any time without notice in order to improve design and
supply the best possible product.
Product specification
Production
This data sheet contains final specifications. Philips Semiconductors
reserves the right to make changes at any time without notice in order to
improve design and supply the best possible product.
Note
1. Please consult the most recently issued data sheet before initiating or completing a design.
20 DEFINITIONS
21 DISCLAIMERS
Short-form specification  The data in a short-form
specification is extracted from a full data sheet with the
same type number and title. For detailed information see
the relevant data sheet or data handbook.
Life support applications  These products are not
designed for use in life support appliances, devices, or
systems where malfunction of these products can
reasonably be expected to result in personal injury. Philips
Semiconductors customers using or selling these products
for use in such applications do so at their own risk and
agree to fully indemnify Philips Semiconductors for any
damages resulting from such application.
Limiting values definition  Limiting values given are in
accordance with the Absolute Maximum Rating System
(IEC 60134). Stress above one or more of the limiting
values may cause permanent damage to the device.
These are stress ratings only and operation of the device
at these or at any other conditions above those given in the
Characteristics sections of the specification is not implied.
Exposure to limiting values for extended periods may
affect device reliability.
Right to make changes  Philips Semiconductors
reserves the right to make changes, without notice, in the
products, including circuits, standard cells, and/or
software, described or contained herein in order to
improve design and/or performance. Philips
Semiconductors assumes no responsibility or liability for
the use of any of these products, conveys no licence or title
under any patent, copyright, or mask work right to these
products, and makes no representations or warranties that
these products are free from patent, copyright, or mask
work right infringement, unless otherwise specified.
Application information  Applications that are
described herein for any of these products are for
illustrative purposes only. Philips Semiconductors make
no representation or warranty that such applications will be
suitable for the specified use without further testing or
modification.
22 PURCHASE OF PHILIPS I2C COMPONENTS
Purchase of Philips I2C components conveys a license under the Philips’ I2C patent to use the
components in the I2C system provided the system conforms to the I2C specification defined by
Philips. This specification can be ordered using the code 9398 393 40011.
2001 Mar 05
49
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
NOTES
2001 Mar 05
50
SAA7706H
Philips Semiconductors
Product specification
Car radio Digital Signal Processor (DSP)
NOTES
2001 Mar 05
51
SAA7706H
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For all other countries apply to: Philips Semiconductors,
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The Netherlands, Fax. +31 40 27 24825
Internet: http://www.semiconductors.philips.com
SCA 71
© Philips Electronics N.V. 2001
All rights are reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner.
The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed
without notice. No liability will be accepted by the publisher for any consequence of its use. Publication thereof does not convey nor imply any license
under patent- or other industrial or intellectual property rights.
Printed in The Netherlands
753503/25/01/pp52
Date of release: 2001
Mar 05
Document order number:
9397 750 07096
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