lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 39

• 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

Bits
Bits
4:0
4:0
12.20 AUX_LEFT CONFIGURATION REGISTER
This register is used to control the left aux analog input.
Note 22: The recommended mixer level is 1V RMS. The auxiliary analog inputs 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.
12.21 AUX_RIGHT CONFIGURATION REGISTER
This register is used to control the right aux analog input.
Note 23: The recommended mixer level is 1V RMS. The auxiliary analog inputs 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
5
6
7
AUX_OR_DAC_R If set, the AUX RIGHT input is passed to the mixer, the default is for the DAC RIGHT output to be passed
AUX_OR_DAC_L If set, the AUX LEFT input is passed to the mixer, the default is for the DAC LEFT output to be passed to
RIGHT_BOOST
AUX_R_MUTE
AUX_L_MUTE
RIGHT_
BOOST
LEVEL
LEVEL
LEFT_
LEFT_
AUX_
AUX_
AUX_
AUX_
Field
Field
This programs the gain/attenuation applied to the AUX LEFT analog input to the mixer. (Note 22)
If set, the gain of the AUX_LEFT input to the mixer is increased by 12 dB (see above).
If set, the AUX LEFT input is muted.
the mixer.
This programs the gain/attenuation applied to the AUX RIGHT analog input to the mixer. (Note 23)
If set, the gain of the AUX_RIGHT input to the mixer is increased by 12 dB (see above).
If set, the AUX RIGHT input is muted.
to the mixer.
AUX_RIGHT_LEVEL
AUX_LEFT_LEVEL
00100 to 11100
00100 to 11100
00000
00001
00010
00011
11101
11110
11111
00000
00001
00010
00011
11101
11110
11111
2
2
2
2
2
2
2
2
2
2
2
2
2
2
TABLE 23. AUX_RIGHT (0x10h)
TABLE 22. AUX_LEFT (0x0Fh)
2
2
39
−28.5 dB to +7.5 dB
−28.5 dB to +7.5 dB
Level (With Boost)
Level (With Boost)
Description
Description
−34.5 dB
−31.5 dB
+10.5 dB
−34.5 dB
−31.5 dB
+10.5 dB
−33 dB
−30 dB
+12 dB
−33 dB
−30 dB
+12 dB
+9 dB
+9 dB
Level (Without Boost)
Level (Without Boost)
−40.5 dB to −4.5 dB
−40.5 dB to −4.5 dB
−46.5 dB
−43.5 dB
−46.5 dB
−43.5 dB
−1.5 dB
−1.5 dB
−45 dB
−42 dB
−45 dB
−42 dB
−3 dB
−3 dB
0 dB
0 dB
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