参数资料
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: 46/112页
文件大小: 5017K
代理商: WLA49VVA
12.0 Status & Control Registers (Continued)
12.18 SIDETONE ATTENUATION REGISTER
This register is used to control the analog sidetone attenuation. (Note 20)
TABLE 19. SIDETONE (0x0Dh)
Bits
Field
Description
3:0
SIDETONE_
ATTEN
Programs the attenuation applied to the microphone preamp output to produce a sidetone signal.
SIDETONE_ATTEN
Attenuation
0000
2
-Inf
0001
2
30 dB
0010
2
27 dB
0011
2
24 dB
0100
2
21 dB
0101
2 to 10102
18 dB to 3 dB
1011
2 to 11112
0dB
Note 20: An active SIDETONE path to an audio output 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 potential pop noises, it is recommended to set SIDETONE_ATTEN to ’0000’ until DC points have stabilized whenever the SIDETONE path is used.
LM4935
www.national.com
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