lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 40

• Manufacturer Part Number: lm49370rl
• Description: Audio Sub-system With An Ultra Low Emi, Spread Spectrum, Class D Loudspeaker Amplifier, A Dual-mode Stereo Headphone Amplifier, And A Dedicated Pcm Interface For Bluetooth Transceivers
• Manufacturer: National Semiconductor Corporation

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Bits
4:0
12.22 DAC CONFIGURATION REGISTER
This register is used to control the DAC levels to the mixer.
Note 24: 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_BOOST
DAC_LEVEL
DAC_MUTE
USE_AUX_
LEVELS
Field
This programs the gain/attenuation applied to the DAC input to the mixer. (Note 24)
If set, the gain of the DAC inputs to the mixer is increased by 12dB (see above).
If set, the stereo DAC input is muted on the next zero crossing.
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.
00100 to 11100
DAC_LEVEL
00000
00001
00010
00011
11101
11110
11111
2
2
2
2
2
2
2
2
TABLE 24. DAC (0x11h)
40
−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