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TWL1109 Datasheet(PDF) 4 Page - Texas Instruments |
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TWL1109 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 27 page TWL1109 VOICE-BAND AUDIO PROCESSOR (VBAP ™) SLWS095 – MARCH 2000 4 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 functional description (continued) sidetone A portion of the transmitted audio is attenuated and fed back to the receive channel through the sidetone path. The sidetone path defaults to the mute condition. The default gain of -12 dB is set in the sidetone control register. The sidetone path can be enabled by writing to the power control register. receive volume control The receive volume control block acts as an attenuator with a range of –18 dB to 0 dB in 2 dB steps for control of the receive channel volume. The receive volume control gain defaults to 0 dB. receive filter and PGA The receive filter is a digital filter that meets CCITT G.714 requirements with a high-pass filter that is selectable through the I2C interface. The device operates in either the 15-bit linear or 8-bit µ-law or A-law companded mode, which is selectable through the I2C interface. The gain defaults to –1 dB representing a 3 dBm0 level for a 32 Ω to 110 Ω load impedance and the corresponding digital full scale PCMI code of –4 dB. 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 The analog signal can be routed to either of two earphone amplifiers, one with differential output (EAR1ON and EAR1OP) and one with single-ended output (EAR2O). Clicks and pops are suppressed for EAR1 differential output only. tone generator The tone generator provides generation of standard DTMF tones which are output to one of the following: 1) The buzzer driver, as a pulse density modulation (PDM) signal. 2) The receive path digital/analog converter (D/A), for outputting through the earphone or as PCMO data. The integer value is loaded into one of two 8-bit registers, the high tone register [04} or the low tone register {05}. The tone output is 2 dB higher when applied to the high tone register {04}. The high DTMF tones must be applied to the high tone register, and the low DTMF tones to the low tone register. |
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