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TDA9875A

Digital TV Sound Processor (DTVSP)

Philips Electronics 

Philips Semiconductors

Digital TV Sound Processor (DTVSP)

Product specification

TDA9875A

1 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)

• Differential Quadrature Phase Shift Keying (DQPSK)

demodulation for different standards, simultaneously

with 1-channel FM demodulation

• Near Instantaneous Companded Audio Multiplex

(NICAM) decoding (B/G, I and L standard)

• 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

• Optional AM demodulation for system L, simultaneously

with NICAM

• 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 Pro

Logic) 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 function for SCART copies

• Dual audio Digital-to-Analog Converter (DAC) from DSP

to analog crossbar switch, bandwidth 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.

2 GENERAL DESCRIPTION

The TDA9875A is a single-chip Digital TV Sound

Processor (DTVSP) for analog and digital multi-channel

sound systems in TV sets and satellite receivers.

2.1 Supported standards

The multistandard/multi-stereo capability of the

TDA9875A is mainly of interest in Europe, but also in

Hong Kong/Peoples Republic of China and

South East Asia. This includes B/G, D/K, I, M and L

standards. In other application areas there exists only

subsets of these standard combinations otherwise only

single standards are transmitted.

M standard is transmitted in Europe by the American

Forces Network (AFN) with European channel spacing

(7 MHz VHF and 8 MHz UHF) and monaural sound.

The AM sound of L/L accent standard is normally

demodulated in the first sound IF. The resulting AF signal

has to be entered into the mono audio input of the

TDA9875A. A second possibility is to use the internal

AM demodulator stage, however this gives limited

performance.

Korea has a stereo sound system similar to Europe and is

supported by the TDA9875A. The differences include

deviation, modulation contents and identification. It is

based on M standard.

An overview of the supported standards and sound

systems and their key parameters is given in Table 1.

The analog multi-channel sound systems (A2, A2+ and

A2*) are 2-Carrier Systems (2CS).

1999 Dec 20

3

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