16
TDA9875:
General description:
The TDA9875 is a single-chip Digital TV Sound Processor (DTVSP) for analogue and digital multi-channel sound systems.
Features:
Demodulator and decoder section:
n
Sound IF (SIF) input switch e.g. to select between terrestrial TV SIF and SAT SIF sources
n
SIF AGC with 21dB control range
n
SIF 8-bit Analogue-to-Digital Converter (ADC)
n
DQPSK demodulation for different standards, simultaneously with 1-channel FM demodulation
n
NICAM decoding (B/G, I and L standard)
n
Two-carrier multistandard FM demodulation (B/G, D/K and M standard)
n
Decoding for three analogue multi-channel systems (A2, A2+ and A2*) and satellite sound
n
Optional AM demodulation for system L, simultaneously with NICAM
n
Programmable identification (B/G, D/K and M standard) and different identification times
DSP section:
n
Digital crossbar switch for all digital signal sources and destinations
n
Control of volume, balance, contour, bass, treble, pseudo stereo, spatial, bass boost and soft-mute
n
Plop-free volume control
n
Automatic Volume Level (AVL) control
n
Adaptive de-emphasis for satellite
n
Programmable beeper
n
Monitor selection for FM/AM DC values and signals, with peak detection option
n
I²S-bus interface for a feature extension (e.g. Dolby surround) with matrix, level adjust and mute.
Analogue audio section:
n
Analogue crossbar switch with inputs for mono and stereo, SCART 1 input/output, SCART2 input/output and line output
n
User defined full-level/-3dB scaling for SCART outputs
n
Output selection of mono, stereo, dual A/B, dual A or dual B
n
20 kHz bandwith for SCART-to-SCART copies
n
Standby mode with functionality for SCART copies
n
Dual audio digital-to-analogue converter from DSP to analogue crossbar switch, bandwith 15kHz
n
Dual audio ADC from analogue inputs to DSP
n
Two dual audio Digital-to-Analogue Converters (DACs) for loudspeakers (Main) and headphone (Auxiliary) outputs;
also applicable for L, R, C and S in the Dolby Pro Logic mode with feature extension.
PINNING
PIN VALUE
1. NICAM clock output (728kHz)
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
2. Serial NICAM DATA output (728kHz)
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
3. First I²C-bus slave address modifier
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
4. SCL (I²C-bus clock)
: LOW level input voltage : Max : 1.6V
HIGH level input voltage : Min : 3.0V
5. SDA (I²C-bus data)
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
6. Analogue supply ground 1
: 0V
7. Analogue supply voltage 1
: 5V, Min : 4.75V, Max : 5.5V
8. Resistor for reference current generator
: Iref : 220mA, Min : 170mA, Max : 260mA
9. First general purpose I/O pin
10. Sound IF input 2
: Min : 21Vrms, Max : 250mVrms
11. Reference voltage for demodulator part
: Vdda1/Vssa1 : 50%, Min : 35%, Max : 65%
12. Sound IF input 1
: Min : 21Vrms, Max : 250mVrms
13. Second I²C-bus slave address modifier
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
14. Digital supply ground 1
: 0V
15. Digital supply voltage 1
: 5V, Min : 4.75V, Max : 5.5V
16. Capacitor for power-on reset
: LOW level input voltage : Max : 1.6V
HIGH level input voltage : Min : 3.0V
17. Crystal oscillator output
18. Crystal oscillator input
19. Tuning voltage output for crystal oscillator
20. Second general purpose I/O pin
21. System clock output
: LOW level input voltage : Max : 0.5V
HIGH level input voltage : Min : 2.9V
22. I²S-bus clock
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
23. I²S-bus word select
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
24. I²S-bus data output 2
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
25. I²S-bus data output 1
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
26. I²S-bus data input 2
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
27. I²S-bus data input 1
: LOW level input voltage : Max : 0.8V
HIGH level input voltage : Min : 2.0V
28. First test pin; connected to ground for normal operation
29. Audio mono input
: 500mVrms
30.Second test pin; connected to ground for normal operation
31. External audio input right channel
: 350mVrms
