描述 Description

GENERAL DESCRIPTION
The TDA9870A is a single-chip Digital TV Sound Processor (DTVSP) for analog multi-channel sound systems in TV sets and satellite receivers.FEATURES
1.1 Demodulator and decoder section
? Sound IF (SIF) input switch e.g. to select between terrestrial TV SIF and SAT SIF sources
? SIF AGC with 24 dB control range
? SIF 8-bit Analog-to-Digital Converter (ADC)
? Two-carrier multistandard FM demodulation (B/G, D/K and M standard)
? Decoding for three analog multi-channel systems (A2, A2+ and A2*) and satellite sound
? Programmable identification (B/G, D/K and M standard) and different identification times.
1.2 DSP section
? Digital crossbar switch for all digital signal sources and destinations
? Control of volume, balance, contour, bass, treble, pseudo stereo, spatial, bass boost and soft mute
? Plop-free volume control
? Automatic Volume Level (AVL) control
? Adaptive de-emphasis for satellite
? Programmable beeper
? Monitor selection for FM/AM DC values and signals, with peak detection option
? I2S-bus interface for a feature extension (e.g. Dolby surround) with matrix, level adjust and mute.
1.3 Analog audio section
? Analog crossbar switch with inputs for mono and stereo (also applicable as SCART 3 input), SCART 1 input/output, SCART 2 input/output and line output
? User defined full-level/?3 dB scaling for SCART outputs
? Output selection of mono, stereo, dual A/B, dual A or dual B
? 20 kHz bandwidth for SCART-to-SCART copies
? Standby mode with functionality for SCART copies
? Dual audio Digital-to-Analog Converter (DAC) from DSP to analog crossbar switch, bandwidth of 15 kHz
? Dual audio ADC from analog inputs to DSP
? Two dual audio DACs for loudspeaker (Main) and headphone (Auxiliary) outputs; also applicable for L, R, C and S in the Dolby Pro Logic mode with feature extension.