lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 41

• 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

Bit
s
0
1
2
3
4
Bits
Bits
12.23 CP_OUTPUT CONFIGURATION REGISTER
This register is used to control the differential cell phone output. (Note 25)
Note 25: The gain of cell phone output amplifier is 0 dB.
12.24 AUX_OUTPUT CONFIGURATION REGISTER
This register is used to control the differential auxiliary output. (Note 26)
Note 26: 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.
12.25 LS_OUTPUT CONFIGURATION REGISTER
This register is used to control the loudspeaker output. (Note 27)
Note 27: The gain of the loudspeaker output amplifier is 12 dB.
0
1
2
3
0
1
2
3
4
MIC_NOISE_GAT
RIGHT_SELECT
LEFT_SELECT
MIC_SELECT
CPO_MUTE
RIGHT_SELECT If set, the right channel of the mixer is added to the AUX_OUT output signal.
RIGHT_SELECT If set, the right channel of the mixer is added to the loudspeaker output signal.
LEFT_SELECT
LEFT_SELECT
CPI_SELECT
CPI_SELECT
AUX_MUTE
Field
LS_MUTE
E
RSVD
Field
Field
If set, the microphone channel of the mixer is added to the CP_OUT output signal.
If set, the right channel of the mixer is added to the CP_OUT output signal.
If set, the left channel of the mixer is added to the CP_OUT output signal.
If set, the CPOUT output is muted.
If this is set and NOISE_GATE_ON (register 0x08h) is enabled, the MIC to CPO path will be gated if the
signal is determined to be noise by the AGC (that is, if the signal is below the set noise threshold).
If set, the cell phone input channel of the mixer is added to the AUX_OUT output signal.
If set, the left channel of the mixer is added to the AUX_OUT output signal.
If set, the AUX_OUT output is muted.
If set, the cell phone input channel of the mixer is added to the loudspeaker output signal.
If set, the left channel of the mixer is added to the loudspeaker output signal.
If set, the loudspeaker output is muted.
Reserved.
TABLE 26. AUX_OUTPUT (0x13h)
TABLE 25. CP_OUTPUT (0x12h)
TABLE 27. LS_OUTPUT (0x14h)
41
Description
Description
Description
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