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TDA9874A

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Datasheet

TDA9874A
(Product Specification)
04-Aug-00, 68 pages, 0 kB

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TDA9874A - Digital TV sound demodulator/decoder

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This product has been withdrawn. Please contact your local Sales or Distributor office for more details.All information hereunder is subject to the subsequent disclaimers

General description

The TDA9874A is a single-chip Digital TV Sound Demodulator/Decoder (DTVSD) for analog and digital multi-channel sound systems in TV/VCR sets and satellite receivers.

Supported standards

The multi-standard/multi-stereo capability of the TDA9874A is of interest in Europe, Hong Kong/PR China and South East Asia. This includes B/G, D/K, I, M and L standards. In other application areas there exist subsets of the standard combinations or only single standards are transmitted.

All A2 (analog 2-carrier) and NICAM systems are supported. M standard (with mono or BTSC stereo sound) can be received and processed in mono sound mode.

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 TDA9874A. A second possibility is to use the internal AM demodulator stage (with 6.5 MHz intercarrier), which gives limited performance.

Korea has a stereo sound system similar to Europe which is supported by the TDA9874A. Differences include deviation, modulation contents and identification. It is based on M standard.

For all FM standards a high deviation mode for a single carrier monaural sound demodulation is selectable.

An overview of the supported standards, sound systems and their key parameters is given in Tables 1 to 3.

The analog multi-channel systems are sometimes also referred to as 2-carrier systems (2CS).

Features

  • Sound IF (SIF) input switch
  • SIF Automatic Gain Control (AGC) with 24 dB control range
  • Switchable 10 dB SIF input attenuator
  • SIF 8-bit Analog-to-Digital Converter (ADC)
  • Easy TV standard programming option
  • 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, D/K, I and L standard)
  • 2-carrier multi-standard FM demodulation (B/G, D/K, I and M standard)
  • Single carrier high deviation FM mono demodulation mode
  • Decoding for three analog multi-channel systems (A2) and satellite sound
  • Adaptive de-emphasis for satellite
  • Programmable identification (B/G, D/K and M standard) and different identification times
  • FM pilot carrier presence detector
  • Optional AM demodulation for L standard, simultaneously with NICAM
  • Monitor selection for FM/AM demodulator outputs and FM and NICAM signals with peak option
  • Automatic FM dematrixing option
  • Digital crossbar switch
  • I²S-bus 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
  • Automatic Volume Level (AVL) control
  • Analog crossbar switch with inputs for mono and stereo
  • Output selection of mono, stereo, dual, dual A or dual B
  • Additional mono output with automatic select
  • 20 kHz bandwidth for analog path
  • Standby mode
  • Automatic output selection for TV applications.

Applications

  • Relay driver
  • High speed line driver
  • Logic level translator.