lm4935rlx National Semiconductor Corporation, lm4935rlx Datasheet - Page 44

• Manufacturer Part Number: lm4935rlx
• Description: Audio Sub-system With Dual-mode Stereo Headphone And Mono High Efficiency Loudspeaker Amplifiers And Multi-purpose Adc
• Manufacturer: National Semiconductor Corporation

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Bits
12.0 Status & Control Registers
12.22 DAC CONFIGURATION REGISTER
This register is used to control the DAC levels to the mixer.
4:0
Note 23: 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.
5
6
7
DAC_LEVEL
DAC_MUTE
USE_AUX_
LEVELS
BOOST
Field
Programs the gain/attenuation applied to the DAC input to the mixer. (Note 23)
If set the gain of the DAC inputs is controlled by the AUX_LEFT and AUX_RIGHT registers, allowing
a stereo balance to be applied.
If set the gain of the DAC inputs to the mixer is increased by 12 dB (see above).
If set the stereo DAC input is muted on the next zero crossing.
00100 to 11100
DAC_LEVEL
00000
00001
00010
00011
11101
11110
11111
2
2
2
2
2
2
2
TABLE 23. DAC (0x11h)
2
(Continued)
44
−28.5 dB to +7.5 dB
Level (With Boost)
Description
−34.5 dB
−31.5 dB
+10.5 dB
−33 dB
−30 dB
+12 dB
+9 dB
Level (Without Boost)
−40.5 dB to −4.5 dB
−46.5 dB
−43.5 dB
−1.5 dB
−45 dB
−42 dB
−3 dB
0 dB