參數(shù)資料
型號： PCM1870RHFT
英文描述： 16-Bit Low-Power Stereo Audio ADC With Microphone Bias and Microphone Amplifier
中文描述： 16位低功耗立體聲音頻ADC，具有麥克風(fēng)偏置和麥克風(fēng)放大器
文件頁數(shù)： 29/49頁
文件大小： 648K
代理商： PCM1870RHFT
www.ti.com
PCM1870
SLAS544–MAY 2007
Register 83
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 83
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RALC
RSV
RRTC
RATC
RCP1
RCP0
RLV1
RLV0
IDX[6:0]:
1010011b (53h) Register 83
RALC: Automatic Level Control (ALC) Enable for Recording
Default value: 0
Auto level control can be enabled with some parameters for microphone input or lower-level analog source.
RALC = 0
RALC = 1
Disabled (default)
Enabled
RRTC: ALC Recovery Time Control for Recording
Default value: 0
This bit selects the time during which a gain level change completes to compress the signal when the input to
the ADC increases in amplitude.
RRTC = 0
RRTC = 1
3.4 s (default)
13.6 s
RATC: ALC Attack Time Control for Recording
Default value: 0
This bit selects the time during which a gain level change completes to expand the signal when the input to the
ADC decreases in amplitude.
RATC = 0
RATC = 1
1 ms (default)
2 ms
RCP[1:0]: ALC Compression Level Control for Recording
Default value: 00
Auto level control can set the compression level to –2, –6, or –12 dB. Higher-level signals should be
compressed to avoid saturation or degradation of sound quality.
RCP[1:0]
0 0
0 1
1 0
1 1
ALC Compression Level Control for Recording
–2 dB (default)
–6 dB
–12 dB
Reserved
RLV[1:0]: ALC Expansion Level Control for Recording
Default value: 00
Auto level control can set the expansion level to 0, 6, 14, or 24 dB. Lower-level signals should be expanded to
make a small signal easy to hear. If set to 0 dB, the ALC can be operated only as a limiter.
RLV[1:0]
0 0
0 1
1 0
1 1
ALC Expansion Level Control for Recording
0 dB (default)
6 dB
14 dB
24 dB
29
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