TDA9874H データシートの表示（PDF） - Philips Electronics

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TDA9874H

Digital TV sound demodulator/decoder

Philips Electronics 

Philips Semiconductors

Digital TV sound demodulator/decoder

Preliminary specification

TDA9874H

1 FEATURES

• SIF input switch e.g. to select between terrestrial TV SIF

and SAT SIF sources

• SIF AGC with 21 dB control range

• SIF 8-bit Analog-to-Digital Converter (ADC)

• DQPSK demodulation for different standards,

simultaneously with 1-channel FM demodulation

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

• Two-carrier multi-standard FM demodulation

(B/G, D/K and M standard)

• Decoding for three analog multi-channel systems

(A2, A2+ and A2*) and satellite sound

• Adaptive de-emphasis for satellite

• Programmable identification (B/G, D/K and M standard)

and different identification times

• Optional AM demodulation for system L, simultaneously

with NICAM

• Monitor selection for FM/AM demodulator outputs and

FM and NICAM signals

• Digital crossbar switch

• I2S serial audio output with matrix, level adjust and mute

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

digital crossbar switch to analog crossbar switch,

bandwidth 15 kHz

• Analog crossbar switch with inputs for mono and stereo

• Output selection of mono, stereo, dual, dual A or dual B

• 20 kHz bandwidth for analog path

• Standby mode.

2.1 Supported standards

The multi-standard/multi-stereo capability of the

TDA9874H is mainly of interest in Europe, but also in

Hong Kong/PR China and South East Asia. This includes

B/G, D/K, I, M and L standard. In other application areas

there exist subsets of those standard combinations or only

single standards are transmitted.

Standard M is transmitted in Europe by the American

Forces Network with European channel spacing

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

The AM sound of L/L’ standard is normally demodulated in

the 1st sound IF. The resulting AF signal has to be entered

into the mono audio input of the TDA9874H. A second

possibility is to use the internal AM demodulator stage,

giving limited performance.

Korea has a stereo sound system similar to Europe and is

supported by the TDA9874H. 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 systems are sometimes also

named 2CS (2 carrier systems).

2 GENERAL DESCRIPTION

The TDA9874H is a single-chip Digital TV Sound

Demodulator/Decoder (DTVSD1) for analog and digital

multi-channel sound systems in TV/VCR sets and satellite

receivers.

1998 Apr 27

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