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LM49370RLX-NOPB Fiches technique(PDF) 32 Page - Texas Instruments |
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LM49370RLX-NOPB Fiches technique(HTML) 32 Page - Texas Instruments |
32 / 89 page LM49370 SNAS356D – FEBRUARY 2007 – REVISED MARCH 2012 www.ti.com DAC CONFIGURATION REGISTER This register is used to control the DAC levels to the mixer. Table 24. DAC (0x11h) Bits Field Description 4:0 DAC_LEVEL This programs the gain/attenuation applied to the DAC input to the mixer. (1) DAC_LEVEL Level (With Boost) Level (Without Boost) 000002 −34.5 dB −46.5 dB 000012 −33 dB −45 dB 000102 −31.5 dB −43.5 dB 000112 −30 dB −42 dB 00100 to 111002 −28.5 dB to +7.5 dB −40.5 dB to −4.5 dB 111012 +9 dB −3 dB 111102 +10.5 dB −1.5 dB 111112 +12 dB 0 dB 5 DAC_BOOST If set, the gain of the DAC inputs to the mixer is increased by 12dB (see above). 6 DAC_MUTE If set, the stereo DAC input is muted on the next zero crossing. 7 USE_AUX_ If set, the gain of the DAC inputs is controlled by the AUX_LEFT and AUX_RIGHT registers, allowing a stereo LEVELS balance to be applied. (1) The output from the DAC is 1V RMS for a full scale digital input. This can be boosted by 12 dB if enough headroom is available. Clipping may occur if the analog power supply is insufficient to cater for the required gain. CP_OUTPUT CONFIGURATION REGISTER This register is used to control the differential cell phone output.(2) Table 25. CP_OUTPUT (0x12h) Bit Field Description s 0 MIC_SELECT If set, the microphone channel of the mixer is added to the CP_OUT output signal. 1 RIGHT_SELECT If set, the right channel of the mixer is added to the CP_OUT output signal. 2 LEFT_SELECT If set, the left channel of the mixer is added to the CP_OUT output signal. 3 CPO_MUTE If set, the CPOUT output is muted. 4 MIC_NOISE_GAT If this is set and NOISE_GATE_ON (register 0x08h) is enabled, the MIC to CPO path will be gated if the signal is E determined to be noise by the AGC (that is, if the signal is below the set noise threshold). (2) The gain of cell phone output amplifier is 0 dB. AUX_OUTPUT CONFIGURATION REGISTER This register is used to control the differential auxiliary output. (1) Table 26. AUX_OUTPUT (0x13h) Bits Field Description 0 CPI_SELECT If set, the cell phone input channel of the mixer is added to the AUX_OUT output signal. 1 RIGHT_SELECT If set, the right channel of the mixer is added to the AUX_OUT output signal. 2 LEFT_SELECT If set, the left channel of the mixer is added to the AUX_OUT output signal. 3 AUX_MUTE If set, the AUX_OUT output is muted. (1) The gain of the auxiliary output amplifier is 0 dB. If a second (external) loudspeaker amplifier is to be used its gain should be set to 12 dB to match the onboard loudspeaker amplifier gain. 32 Submit Documentation Feedback Copyright © 2007–2012, Texas Instruments Incorporated Product Folder Links: LM49370 |
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