STMICROELECTRONICS TDA7434

TDA7434
BASIC FUNCTION AUDIO PROCESSOR
TWO STEREO AND ONE MONO INPUTS
MUTE FUNCTION (SOFTWARE AND HARDWARE) CONTROLLED
VOLUME CONTROL IN 1dB STEP
BASS AND TREBLE CONTROL
FOUR SPEAKER ATTENUATORS:
– Independentattenuation control
– Independentmute function
ALL FUNCTIONS PROGRAMMABLE VIA
I2CBUS
FULLY PROGRAMMABLE LOUDNESS CONTROL
SDIP24
ORDERING NUMBER: TDA7434
DESCRIPTION
The TDA7434 is a volume, tone (bass and treble)
balance (Left / Right) fader (Front / Rear) processor for quality audio applications in car radio and
Hi-Fi systems.
Control is accomplished by serial bus microprocessor interface.
The AC signal setting is obtained by resistor networks and switches combined with operational
amplifiers.
Thanks to the advanced BIPOLAR/CMOS Technology, the external components have been reduced.
BLOCK DIAGRAM
4.7K
100nF
IN1_L
IN2_L
MONO/MUTE
IN2_R
IN1_R
VS
LOUD_L
BIN_L
7
12
2.7nF
100nF
BOUT_L
TRL
11
13
19
SPKR
ATT
6
2
MUX
VOL
BASS
SPKR
ATT
TREBLE
17
21
4
S BUS DECODER + LATCHES
1
VOL
MUX
BASS
22
SPKR
ATT
TREBLE
18
LEFT FRONT
LEFT REAR
SCL
SDA
RIGHT FRONT
5
20
SPKR
ATT
SUPPLY
23
GND
24
8
10
9
14
CREF
LOUD_R
BIN_R
BOUT_R
TRR
100nF
100nF
16
RIGHT REAR
D95AU360A
2.7nF
4.7K
August 1996
1/10
This is advanced information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
TDA7434
ABSOLUTE MAXIMUM RATINGS
Symbol
VS
Parameter
Value
Operating Supply Voltage
Tamb
Operating Temperature Range
Tstg
Storage Temperature Range
Unit
10.2
V
-40 to 85
°C
-55 to +150
°C
QUICK REFERENCE DATA
Symbol
Parameter
VS
Supply Voltage
Min.
Typ.
Max.
Unit
7
9
10.2
V
VCL
Max. Input Signal Handling
THD
Total Harmonic Distortion (V = 1Vrms f = 1kHZ)
1.3
0.05
1.6
Vrms
%
S/N
Signal to Noise Ratio
102
dB
Sc
Channel Separation f = 1kHz
100
dB
Volume Control 1dB step
-79
+32
dB
Bass Control 2dB step
-18
+18
dB
Treble Control 2dB step
-14
+14
dB
0
dB
Speaker Attenuators
-37.5
Mute Attenuation
100
dB
PIN CONNECTION (Top View)
IN2_R
1
24
CREF
IN2_L
2
23
GND
N.C.
3
22
SDA
MONO/MUTE
4
21
SCL
IN1_R
5
20
VS
IN1_L
6
19
OUT_LF
LOUD_L
7
18
OUT_RF
LOUD_R
8
17
OUT_LR
BOUT_R
9
16
OUT_RR
BIN_R
10
15
N.C.
BOUT_L
11
14
TRR
BIN_L
12
13
TRL
D95AU361
THERMAL DATA
Symbol
Rth j-pins
2/10
Parameter
Thermal Resistance Junction-pins
Max.
Value
Unit
65
°C/W
TDA7434
APPLICATION CIRCUIT
4.7K
68nF
2.7nF
100nF
LOUD_L
BIN_L
7
12
100nF
BOUT_L
TRL
11
13
IN1_L
6
IN2_L
2
19
SPKR
ATT
100nF
MUX
VOL
BASS
SPKR
ATT
TREBLE
17
LEFT FRONT
LEFT REAR
100nF
100nF
21
4
S BUS DECODER + LATCHES
MONO/
MUTE
22
SCL
SDA
100nF
VS 9V
100nF
100nF
IN2_R
1
IN1_R
5
VS
VOL
MUX
20
BASS
SPKR
ATT
SUPPLY
23
GND
10µF
SPKR
ATT
TREBLE
24
8
10
9
14
CREF
LOUD_R
BIN_R
BOUT_R
TRR
68nF
100nF
100nF
18
16
RIGHT FRONT
RIGHT REAR
D95AU362A
2.7nF
4.7K
3/10
TDA7434
ELECTRICAL CHARACTERISTICS (Tamb = 25°C, VS = 9V, RL = 10kΩ, Rg = 50Ω,
all variable gains = 0dB, f = 1kHz, unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
130
Unit
INPUT SELECTOR
R IN
Input Resistance
VCL
Clipping Level
SIN
AMUTE
70
100
1.3
1.6
Vrms
Input Separation
70
90
dB
Input Mute Attenuation
70
95
dB
d ≤ 0.3%
Mute DC Step
VDC
MUTE AT AM INPUT (*)
V IL
Input Low Voltage
0.2
AM not selected
kΩ
10
mV
0.4
V
VOLUME CONTROL
GMAX
Max. Gain
30.5
32
33.5
dB
AMAX
Max Attenuation
75
79
83
dB
Astep
Step Resolution
0.5
1
1.5
dB
G = +20 to -20dB
-1
0
+1
dB
G = -20 to -60dB
-2
EA
Attenuation Set Error
Note 2
2
dB
2
dB
ET
Tracking Error
G = +20 to -60dB
VDC
DC Steps
Adjacent Attenuation Steps,
Range from 0 to -79dB
0.1
4
mV
From 0dB to -79dB
0.5
10
mV
dB
LOUDNESS CONTROL
AMAX
Control Range
14
15
16
Astep
Step Resolution
0.5
1
1.5
dB
RLOUD
Internal Resistor
37
50
63
kΩ
dB
BASS CONTROL
Max. Bass boost
15.5
+18
20
BCUT
Max. Bass cut
-20
-18
-15.5
dB
AStep
Step Resolution
1
2
3
dB
Internal Feedback Resistance
48
65
82
kΩ
±13
±14
±15
dB
1
2
3
dB
BRANGE
RB
TREBLE CONTROL
C RANGE
Astep
Control Range
Step Resolution
SPEAKER ATTENUATORS
C RANGE
Astep
AMUTE
Control Range
Step Resolution
From 0 to -24dB
Output Mute Attenuation
EA
Attenuation Set Error
From 0 to -24dB
VDC
DC Steps
Adjacent Attenuation Steps
36
37.5
39
dB
0.5
1
1.5
dB
70
90
1
dB
4
mV
0.1
dB
AUDIO OUTPUTS
VCLIP
Clipping Level
GOUT
Output Gain (fixed)
RL
CL
Output Load Resistance
d = 0.3%
2
2.5
3.5
4
AC - connected
3
DC connected to GND
5
Output Impedance
VDC
DC Voltage Level
3.7
dB
kΩ
Output Load Capacitance
ROUT
Vrms
4.5
10
nF
30
100
Ω
4.0
4.3
V
(*) The mute function can be activated without using the I2C bus by grounding the AM input when AM is not selected. This causes the input
multiplexer to select the reference voltage instead of an input signal.
4/10
TDA7434
ELECTRICAL CHARACTERISTICS (continued)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
GENERAL
VS
Supply Voltage
6
9
10.2
V
IS
Supply Current
5
8
11
mA
Power Supply Rejection Ratio
65
85
PSRR
Output Noise
e NO
S/N
20Hz - 20kHz ”A” - weighted
BW = 200Hz - 20kHz, flat
output muted
4
7.0
5.5
Signal to Noise Ratio
all gains = 0dB; VO = 1Vrms
103
d
Distortion
VOUT = 1Vrms
0.04
Sc
Channel Separation
ET
Total Tracking Error
70
AV = 0 to -20dB
AV = -20 to -60dB
dB
20
dB
0.15
80
0
0
µV
µV
µV
%
dB
1
2
dB
dB
1
V
+5
µA
0.40
V
BUS INPUTS
V IL
Input Low Voltage
VIH
Input High Voltage
IIN
Input Current
VIN = 0.4V
VO
Output Voltage
SDA Acknowledge
IO = 1.6mA
3
V
-5
0.15
SOFTWARE SPECIFICATION
Interface Protocol
The interface protocol comprises:
– a start condition (S)
– a chip address byte (the LSB bit determines read / write transmission)
– a subaddress byte
– a sequence of data (N-bytes + acknowledge)
– a stop condition (P)
SUBADDRESS
CHIP ADDRESS
MSB
S
1
LSB
0
0
0
1
0
1
MSB
R/W ACK X
DATA 1...DATA n
LSB
X
X
MSB
I A3 A2 A1 A0 ACK
LSB
DATA
ACK P
ACK = Acknowledge
S = Start
P = Stop
MAX CLOCK SPEED 500kbits/s
Auto Increment
If bit I in the subaddress byte is set to ”1”, the autoincrement of the subaddress is enabled.
5/10
TDA7434
SUBADDRESS (receive mode)
MSB
X
LSB
X
X
I
A3
A2
A1
A0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
FUNCTION
Input selector
Volume
Bass, Treble
Speaker attenuator LF
Speaker attenuator LR
Speaker attenuator RF
Speaker attenuator RR
Loudness
I = Auto increment
X = Not used
DATA BYTE SPECIFICATION
X = not relevant; set to ”1” during testing
Input Selector
MSB
D7
LSB
D6
D5
D4
D3
D2
D1
D0
0
0
0
0
1
0
0
1
1
X
0
1
0
1
X
0
1
0
1
FUNCTION
IN 2
IN 1
mono
no input selected
mute (low homic)
non-symmetrical bass cut (note 1)
symmetrical bass cut
extended bass range
standard bass range ±14dB
For example to select the MONO input the Data Byte is: X X X X X 0 1 0.
An additional direct mute function is included in the Speaker Attenuators.
Note 1: Bass cut for very low frequencies.
MSB
LSB
D7(*)
D6
D5
D4
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
D3
D2
D1
VOLUME
D0
+32dB
+16dB
0dB
-16dB
-32dB
-48dB
-64dB
0
0
0
0
0
0
0
0
1
0
1
0
0dB
-1dB
-2dB
1
1
1
1
-15dB
(*) Loudness = ON
Note 2:
It is not recommended to use a gain more than 20dB for system performance reason. In general, the max. gain should be limited by
software to the maximum value, which is needed for the system.
6/10
TDA7434
Bass, Treble
MSB
D7
LSB
D6
D5
D4
D4
Input
Selector
0
0
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
D3
D2
D1
D0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
Treble Steps
- 14dB
-12dB
-10dB
-8dB
-6dB
-4dB
-2dB
0dB
0dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB
Bass Steps
-18dB
-16dB
-14dB
-12dB
-10dB
-8dB
-6dB
-4dB
-2dB normal
0dB range
0dB ±14dB
+2dB
+4dB
+6dB
+8dB
+10dB
+12dB
+14dB
+16dB
+18dB
1
0
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
0
1
0
0
0
0
1
1
0
0
1
1
1
1
0
0
1
1
0
0
0
0
FUNCTION
For example 12dB Treble and -8dB Bass give the following DATA BYTE: 0 0 1 1 1 0 0 1
Speaker Attenuators
MSB
LSB
SPEAKER ATTENUATOR LF, LR, RF, RR
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
0
0
0
0
0
0
0
0
0
1
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
:
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
1
1
1
1
0
0
1
1
0
1
1
1
0
1
0
1
0
1
0
1
0dB
-1dB
:
-24dB
-25.5dB
-27dB
-28.5dB
-30dB
-32dB
-34.5dB
-37.5dB
X
X
1
X
X
X
X
X
Speaker Mute
7/10
TDA7434
Loudness
MSB
LSB
D7
D6
D5
D4
D3
D2
D1
D0
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
D3
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
D2
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
D1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
D0
LOUDNESS
0dB
-1dB
-2dB :
-3dB
-4dB
-5dB
-6dB
-7dB
-8dB
-9dB
-10dB
-11dB
-12dB
-13dB
-14dB
-15dB
Loudness flat (Note 3)
For example to select -14dB Loudness the Data Byte is : X X X 0 1 1 1 0.
Note 3:
FIat attenuation, according to the selected byte. The loudness can be completely disabled by setting bit D7 in the volume byte to ”0”. In this
case the attenuation is 0dB independent from the loudness settings.
Functional Description
The input selector is able to select 2 stereo inputs
and 1 mono input (AM). The inputs are DC biased
with a 100kΩ resistors to the internal reference
voltage of 3V. The AM input can be used additionally as hardware mute pin. If this pin is pulled
to ground by an external transistors and AM is not
selected, the input selector mutes the input (reference voltage selected). The AM part is considered to be switched OFF. If the output of the AM
part is not high ohmic in this condition, a series
resistor of about 20kΩ has to be foreseen.
The volume control can be programmed from a
gain of +32dB to an attenuation of -79dB in 1dB
steps. The maximum gain should be kept as low
as possible for system performance reason. It has
to be limited by software to the absolute necessary system gain, depending on the signal source
level and the power amplifier gain.
The bass control acts in a range from +18dB to 18dB in 2dB steps. The filter response is deter-
8/10
mined by the external filter components. An extensive simulation software is available in order to
support the design of the bass filter response with
different filter configurations.
The extended bass boost range of +18dB allows
the implementation of the software loudness function by additional bass and treble boost.
The treble control acts in a range of ±14dB in 2dB
steps. The external capacitor determines with the
internal resistor of 50KΩ the corner frequency of
the treble response.
The four speaker attenuators can be controlled independently from 0 to -37.5dB, which allows the
implementation of balance and fader for a four
speaker system. The attenuation steps size is 1
db from 0 to -24dB and increases nonlinearly up
to the maximum attenuation of 37.5dB. A special
mute bit forces the speaker attenuator into the
mute position.
All 4 outputs are low distortion push pull outputs,
able to drive a load of 3kΩ.
TDA7434
SDIP24 PACKAGE MECHANICAL DATA
mm
DIM.
MIN.
inch
TYP.
MAX.
A
MIN.
TYP.
MAX.
5.08
0.20
A1
0.51
0.020
A2
3.05
3.30
4.57
0.120
0.130
0.180
B
0.36
0.46
0.56
0.0142
0.0181
0.0220
B1
0.76
1.02
1.14
0.030
0.040
0.045
c
0.23
0.25
0.38
0.0090
D
22.61
22.86
23.11
0.890
E
7.62
8.64
0.30
E1
6.10
6.86
0.240
6.40
0.0098
0.0150
0.90
0.910
0.340
0.252
e
1.778
0.070
e1
7.62
0.30
0.270
e2
10.92
0.430
e3
1.52
0.060
L
2.54
3.30
3.81
0.10
0.130
0.150
E
A
L
A2
A1
E1
Stand-off
B
B1
e
e1
e2
c
E
D
13
.015
F
24
0,38
Gage Plane
1
12
e3
SDIP24
e2
9/10
TDA7434
Information furnished is believed to be accurate and reliable. However, SGS-THOMSON Micr oelectronics assumes no responsability for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may results from its use. No
license is granted by implication or otherwise under any patent or patent rights of SGS-THOMSON Microelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied.
SGS-THOMSON Microelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of SGS-THOMSON Microelectronics.
 1995 SGS-THOMSON Microelectronics - Printed in Italy - All Rights Reserved
SGS-THOMSON Microelectronics GROUP OF COMPANIES
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