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| 型号： | WLA49VVA |
| 厂商： | National Semiconductor Corporation |
| 元件分类： | ADC |
| 英文描述： | Audio Sub-System with Dual-Mode Stereo Headphone and Mono High Efficiency Loudspeaker Amplifiers and Multi-Purpose ADC |
| 中文描述： | 音频子系统的双模单声道立体声耳机和扬声器放大器的高效率和多功能模数转换器 |
| 文件页数： | 44/112页 |
| 文件大小： | 5017K |
| 代理商： | WLA49VVA |
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12.0 Status & Control Registers (Continued)
12.16 MIC_1 CONFIGURATION REGISTER
This register is used to control the microphone configuration.
TABLE 16. MIC_1 (0x0Bh)
Bits
Field
Description
3:0
PREAMP_GAIN
Programs the gain applied to the microphone preamplifier if the AGC is not in use.
PREAMP_GAIN
Gain
0000
2
6dB
0001
2
8dB
0010
2
10 dB
0011
2
12 dB
0100
2 to 11002
14 dB to 30 dB
1101
2
32 dB
1110
2
34 dB
1111
2
36 dB
4
MIC_MUTE
If set the microphone preamplifier is muted.
5
INT_SE_DIFF
If set the internal microphone is assumed to be single ended and the negative connection is
connected to the ADC common mode point internally. This allows a single-ended internal
microphone to be used.
6
INT_EXT
If set the single ended external microphone is used and the negative microphone input is grounded
internally, otherwise internal microphone operation is assumed. (Note 19)
Note 19: On changing INT_EXT from internal to external note that the dc blocking cap will not be charged so some time should be taken (300 ms fora1F cap)
between the detection of an external headset and the switching of the output stages and ADC to that input to allow the DC points on either side of this cap to stabilize.
This can be accomplished by deselecting the microphone input from the audio outputs and ADC until the DC points stabilize.
An active MIC path to CPOUT or the ADC may result in the microphone DC blocking caps causing audio pops under the following situations:
1) Switching between internal and external microphone operation while in chip modes ’10’ or ’11’.
2) Toggling in and out of powerdown/standby modes.
3) Toggling between chip modes ’10’ and ’11’ whenever external microphone operation is selected.
4) The insertion/removal of a headset while in chip modes ’10’ or ’11’ whenever external microphone operation is selected.
To avoid these potential pop issues, it is recommended to deselect the microphone input from CPOUT and ADC until the DC points stabilize.
LM4935
www.national.com
37
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