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TWL1106 Datasheet(PDF) 3 Page - Texas Instruments |
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TWL1106 Datasheet(HTML) 3 Page - Texas Instruments |
3 / 19 page TWL1106 VOICEBAND AUDIO PROCESSOR (VBAP) SLWS094 – JUNE 2001 3 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 detailed description power up/reset An external reset must be applied to the active-low RESET terminal while MCLK is active to ensure reset at power up. reference A precision band-gap reference voltage is generated internally and supplies all required references to operate the transmit and receive channels. phase-locked loop The phase-locked loop generates the internal clock frequency required for internal digital filters and modulators by phase locking to 2.048-MHz master clock input. PCM interface The PCM interface transmits and receives data at the PCMO and PCMI terminals, respectively. The data is transmitted or received at the MCLK speed once on each PCMSYN cycle. The PCMSYN can be driven by an external source that is derived from the master clock and used as an interrupt to the host controller. microphone input The microphone input circuit consists of two differential input/differential output amplifiers (MIC Amp 1 and MIC Amp 2). MIC Amp 1 is a low-noise differential amplifier capable of an externally set gain. MIC Amp 2 is a differential amplifier with a fixed gain of 6 dB. analog modulator The transmit channel modulator is a third-order sigma-delta design. transmit filter The transmit filter is a digital filter designed to meet Consultive Committee on International Telegraphy and Telephony (CCITT) G.714 requirements. The TWL1106 device operates in either the 13-bit linear or 8-bit companded µ-law mode. receive filter The receive (RX) filter is a digital filter that meets CCITT G.714 requirements. The TWL1106 device operates in either the 13-bit linear or 8-bit µ-law companded mode, which is selected at the LINSEL input. receive volume control In linear mode, the three least significant bits of the 16-bit PCMI data sample is used to control volume. The volume range is –18 dB to 3 dB in 3-dB steps. digital modulator and filter The second-order digital modulator and filter convert the received digital PCM data to the analog output required by the earphone interface. earphone amplifiers EAROUT is recommended for use as a differential output; however, it can be connected in single-ended topology as well. Clicks and pops are suppressed from the differential output. |
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