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TDA9875A 数据表(PDF) 3 Page - NXP Semiconductors |
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TDA9875A 数据表(HTML) 3 Page - NXP Semiconductors |
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3 / 96 page  1999 Dec 20 3 Philips Semiconductors Product specification Digital TV Sound Processor (DTVSP) 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). |
类似零件编号 - TDA9875A |
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类似说明 - TDA9875A |
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