Teac EU-80ST, Руководство по обслуживанию

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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