Freescale MC44C404EP Nicam 728 - stereo encoder Datasheet

Freescale Semiconductor
Advance Information
Document Number: MC44C404
Rev. 0.4, 2/2008
NICAM 728 - Stereo Encoder
MC44C404
The MC44C404 NICAM Stereo Encoder is the industry’s first single-chip
CMOS implementation of a Near Instantaneous Companding Audio Multiplex
728 (NICAM) stereo encoder.
• Intended for use in set-top boxes, VCRs, DVD players/recorders, game
stations, and other applications that are required to output high-quality stereo
sound through a single RF coaxial cable.
• Engineered to process analog audio signals to generate a QPSK modulated
signal in compliance with the EN 300 163 standard.
• Designed to output this signal to a Freescale RF modulator, which in turn
produces a stereo encoded RF channel for use with any NICAM stereo
television receiver.
NICAM STEREO ENCODER
Features
Supports B, G, H, I, K1, L system standards
NICAM digital audio processing encodes and transports stereo signals
Integrated A/D converter input and D/A converter output circuitry
Extended low frequency response (below 25 Hz)
Simple passive interface to MC44BS373/4 UHF modulators
Low power consumption - typically < 50 mW
RoHS compliant
EP SUFFIX
32-LEAD TQFN PACKAGE
CASE 1457-01
Benefits
• Preservation of original surround sound fidelity
• Multi standard
• Low system component count, small board size and significantly low overall
system cost
• No manual alignment of filters or phase controls
ORDERING INFORMATION
MC44C404EP
0°C to
32TQFN
NC
CLK4MHZ
VREFP
MC44C404
DVDD
SYS_I
DVSS
DVSS
ADCVSS
NC
QPSK
OVSS
NC
NC
Functional Block Diagram
CLOCK
OUT
VAGO
ADCVDD
VINA
CLOCK
GENERATOR
MC44C404 32TQFN Package
This document contains information on a preproduction product. Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2008. All rights reserved.
Yes
OVDD
XTALOUT
DVSS
XTALIN
C3
C4
C1
C2
DAC
Yes
DVSS
VINB
VAGO
VREFM
XTAL
Tape & Reel
NC
QPSK
AUDIO
NC
Σ∆ADC
NICAM
DIGITAL
AUDIO
PROCESSOR
Package RoHS
MC44C404EPR2
MC44C404
Σ∆ADC
Temp.
Range
+70°C
Reference Documentation
NICAM 728: Transmission of two-channel digital sound with terrestrial
television systems B, G, H, I, K1 and L. (EN 300 163 V1.2.1)
AUDIO
A - CHANNEL
AUDIO
B - CHANNEL
Device
VAGO
OVDD
•
•
•
•
•
•
•
MC44C404
XTALOUT 27
ADCVDD
7
VINA
9
VAGO 10
22 CLK4MHZ
4 MHz
XTALIN 28
Clock
Generator
Oscillator
Σ∆
11 OVDD
ADC
15 QPSK
DAC
VREFP
4
VAGO
6
VREFM
5
V-REF
26 DVSS
VINB
2
Σ∆
VAGO
3
ADC
25 OVDD
24 DVSS
ADCVSS
21 DVDD
8
19 DVSS
SYS_I 20
18 DVSS
C1 32
16 OVSS
C2 31
C3 30
C4 29
NICAM 728
Audio Processor
Figure 1. MC44C404 Block Diagram
MC44C404
2
Freescale Semiconductor
OVDD
XTALOUT
DVSS
XTALIN
C3
C1
C2
ORIENTATION MARK
C4
PIN DESCRIPTION
DVSS
NC
VINB
VAGO
NC
PIN 1
VREFP
CLK4MHZ
MC44C404
VREFM
VAGO
ADCVDD
DVDD
SYS_SEL
DVSS
DVSS
ADCVSS
QPSK
OVSS
NC
NC
NC
VINA
VAGO
OVDD
NC
Figure 2. MC44C404 32-Lead TQFN Package
Table 1. Pin Descriptions (Listed by Function)
Signal Name
Pin #
Description
Analog
VINA
9
A channel input
VREFP
4
ADC voltage ref. bypass plus
VAGO
3, 6, 10
VREFM
5
ADC voltage ref. bypass minus
VINB
2
B channel input
C1
32
C2
31
Control inputs 1, 2 and 3.
See Table 2, Application Control Bits for setting these application control bits.
C3
30
C4
29
Control input 4 is the reserve sound switching flag.
C4 = 0: The analog signal is not carrying the same program as the digital signal.
C4 = 1: The analog sound signal is carrying the same program as the digital signal.
SYS_I
20
Output system format select.
SYS_I = 0: The output format is System B, G, H, K1 or L.
SYS_I = 1: The output format is System I.
QPSK
15
QPSK NICAM audio output
NC
1, 12, 13, 14, 17, 23
XTALIN
28
Crystal oscillator input
XTALOUT
27
Crystal oscillator output
CLK4MHZ
22
4 MHz clock output for Audio/Video modulator IC
ADCVDD
7
ADC analog supply voltage, 3.3 V
ADCVSS
8
ADC analog ground
Digital logic supply voltage, 1.8 V
Analog virtual ground
Digital
No connection
Clocks
Power Supply
DVDD
21
DVSS and OVSS
16, 18, 19, 24, 26
OVDD
11, 25
Digital logic/I/O ground
I/O supply voltage, 3.3 V
MC44C404
Freescale Semiconductor
3
Table 2. Application Control Bits
C1
C2
C3
Contents of the 704-Bit Sound/Data Blocks
0
0
0
Stereo signal
0
1
0
Two independent mono sound signals
1
0
0
One mono signal and one 352 Kbits/sec data channel
1
1
0
One 704 Kbits/sec data channel
X
X
1
Reserved
ELECTRICAL SPECIFICATIONS
Table 3. Absolute Maximum Ratings
Absolute maximum continuous ratings are those maximum values beyond which damage to the device may occur. Exposure to
these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation at absolutemaximum-rated conditions is not implied.
Characteristic
Digital Logic Supply Voltage
Digital Output Supply Voltage
Symbol
Min
Max
Units
DVDD
–0.3
+2.0
V
OVDD
–0.3
+4.0
V
ADCVDD
–0.3
+4.0
V
Input Voltage
Vin
–0.3
xVDD + 0.3
V
Storage Temperature Range
Tstg
–55
+150
°C
ADC Supply Voltage
Table 4. General Specifications
Characteristic
Symbol
Min
Typ
Max
Units
ESD Protection (Charge Device Model)
CDM
500
—
—
V
ESD Protection (Human Body Model)
HBM
2000
—
—
V
LU
200
—
—
mA
Symbol
Min
Typ
Max
Units
DVDD
1.62
1.8
1.98
V
Latch-Up Immunity
Table 5. Recommended Operating Conditions
Characteristic
Digital Logic Supply Voltage
Digital Output Supply Voltage
OVDD
2.97
3.3
3.63
V
ADCVDD
2.97
3.3
3.63
V
VINA, VINB
—
—
1.8
Vpp
TA
0
—
70
°C
Symbol
Min
Typ
Max
Units
Digital Logic Supply Current
IDVDD
—
7.5
8.5
mA
Digital Output Supply Current
IOVDD
—
2.0
8.0
mA
IADCVDD
—
7.0
9.0
mA
ADC Voltage Ref. Bypass Plus
VREFP
—
2.0
—
V
ADC Voltage Ref. Bypass Minus
VREFM
—
1.0
—
V
VAGO
—
1.5
—
V
CLK4MHZ, Clock Output Low @ I = 0.6 mA
Vol
2.97
—
—
V
CLK4MHZ, Clock Output High @ I = 0.6 mA
Voh
—
—
3.63
V
ADC Supply Voltage
A/B Channel Input Level
Ambient Temperature
Table 6. DC Characteristics
Characteristic(1)
ADC Supply Current
ADC Voltage Ref. Ground
1. Unless other wise noted: DVDD = 1.8 + 0.18 Vdc, OVDD = ADCVDD = 3.3 + 0.33 Vdc, GND = 0 Vdc, 0 < TA < 70°C
MC44C404
4
Freescale Semiconductor
Table 7. AC Characteristics (Test setup as shown in Figure 3, MC44C404 Typical Application Circuit for B, G and H Systems)
Characteristic(1)
Input Impedance (A/B Input)
Symbol
Min
Rin
Typ
Max
Units
—
22
—
KΩ
QPSK Audio Output Level(2)
—
0.85
—
Vpp
QPSK Output Level
—
—
2.2
Vpp
72
75
—
dB
THD
—
0.1
0.3
%
BW
20
—
14500
Hz
(2),(3)
Signal to Noise Ratio
Total Harmonic Distortion
(2),(3)
-1 dB Bandwidth
SNR
1. Unless other wise noted: DVDD = 1.8 + 0.18 Vdc, OVDD = ADCVDD = 3.3 + 0.33 Vdc, GND = 0 Vdc, 0 < TA < 70°C
2. Test conditions, mono, 1 kHz @ 1.5 Vpp
3. Measured in 20 Hz to 13.5 kHz bandwidth
SYSTEM APPLICATION NOTES
DESIGN CONSIDERATIONS
When developing an application using the MC44C404
NICAM Stereo Encoder, the user can significantly improve
performance by following the suggestions below.
1. There must be a notch in the video because video
spectra that fall into the audio range will severely impact
the audio performance.
2. A band pass filter is required on the QPSK output.
Modulator Interface
3. The 4 MHz clock drive to the MC44BS373 must be
filtered and the level set correctly. This can be achieved
by using a Low Pass Filter (LPF), as shown in LPF1 in
Figure 3, MC44C404 Typical Application Circuit for B, G
and H Systems.
4. To set the application control bits see Table 1, Pin
Descriptions (Listed by Function) and Table 2,
Application Control Bits
MC44C404
Freescale Semiconductor
5
Vin
3.3 V
3.3 V REG
1 µF
47 Ω
22 µH
1 µF
1 µF
75 Ω
0.1 µF 0.1 µF
0.1 µF
+5 V
3
10
6
1 µF
4
5
0.1 µF
0.1 µF
VAGO
VAGO
QPSK
15
8
BPF1
VAGO
VREFP
MC44C404
VREFM
10
15
VCCD
1 µF
VCCA
13
OVDD 11
25
.022 µF
TVOVCC
VINB
OVDD
VINA
ADCVDD
V
2
V
B Input
9
DVDD
1 µF
A Input
7
21
2.2 KΩ
.01 µF
PLLFLT
AUXIN
22 pF MC44BS373CAFC
Modulator
TVOUT
CLK4MHZ
3
22
LPF1
12 .047 µF
14
RFOUT
1000 pF
XTAL
SPFLT
7
XTALOUT
20
SCL
19
2.2 KΩ
I2C
27
XTALIN
DVSS
DVSS
OVSS
28
16
18
19
C4
DVSS
C3
8
28
Video Notch
C2
DVSS
29
VIDEO
.1 µF
C1
24
31
9
SYS_I
26
32
ADCVSS
V
20
V V
SYS_I
SDA
2.2 µF
24 MHz
SIGNAL
STANDARD
SYS_I = 0 SYSTEMS B, G, H, L
SYS_I = 1
SYSTEM I
CVBS
18 pF
Digital Ground
V
18 pF
IN
Analog Ground
2 MΩ
75 Ω
BPF1 - SYS_I
BPF1 - PAL
1.5 KΩ
2.0 KΩ
1.5 KΩ
75 pF
1 µH
680 pF
1 µH
680 pF
1.0 KΩ
2.0 KΩ
LPF1
750 Ω
33 pF
1 µH
1 µH
560 pF
1 µH
1 KΩ
560 pF
1500 pF
Figure 3. MC44C404 Typical Application Circuit for B, G and H Systems
MC44C404
6
Freescale Semiconductor
PACKAGE DATA
MC44C404
Freescale Semiconductor
7
MC44C404
8
Freescale Semiconductor
MC44C404
Freescale Semiconductor
9
MC44C404
10
Freescale Semiconductor
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MC44C404
Rev 0.4
2/2008
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