lm49370rl National Semiconductor Corporation, lm49370rl Datasheet - Page 42

• 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
Bits
12.26 HP_OUTPUT CONFIGURATION REGISTER
This register is used to control the stereo headphone output. (Note 28)
Note 28: The gain of the headphone output amplifier is –6 dB for the cell phone input channel and sidetone channel of the mixer. When the STEREO bit (0x00h)
is set, headphone output amplifier gain is –6 dB for the left and right channel. When the STEREO bit (0x00h) is cleared, the headphone output amplifier gain is
–12 dB for the left and right channel (to allow enough headroom for adding them and routing them to both headphone amplifiers).
12.27 EP_OUTPUT CONFIGURATION REGISTER
This register is used to control the mono earpiece output. (Note 29)
Note 29: The gain of the earpiece output amplifier is 6 dB.
0
1
2
3
4
5
6
0
1
2
3
4
SIDETONE_SELECT If set, the sidetone channel of the mixer is added to both of the headphone output signals.
SIDETONE_SELECT If set, the sidetone channel of the mixer is added to the earpiece output signal.
RIGHT_SELECT
RIGHT_SELECT
LEFT_SELECT
LEFT_SELECT
CPI_SELECT
CPI_SELECT
HP_MUTE
EP_MUTE
STEREO
Field
Field
OCL
If set, the cell phone input channel of the mixer is added to both of the headphone output signals.
If set, the right channel of the mixer is added to the headphone output. If the STEREO bit (0x00h) is
set, the right channel is added to the right headphone output signal only. If the STEREO bit (0x00h)
is cleared, it is added to both the right and left headphone output signals.
If set, the left channel of the mixer is added to the headphone output. If the STEREO bit (0x00h) is
set, the left channel is added to the left headphone output signal only. If the STEREO bit (0x00h) is
cleared, it is added to both the right and left headphone output signals.
If set, the headphone output is muted.
If set, the mixers assume that the signals on the left and right internal busses are highly correlated and
when these signals are combined their levels are reduced by 6dB to allow enough headroom for them
to be summed.
If set, the part is placed in OCL (Output Capacitor Less) mode.
If set, the cell phone input channel of the mixer is added to the earpiece output signal.
If set, the right channel of the mixer is added to the earpiece output signal.
If set, the left channel of the mixer is added to the earpiece output signal.
If set, the earpiece output is muted.
TABLE 28. HP_OUTPUT (0x15h)
TABLE 29. EP_OUTPUT (0x16h)
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Description
Description