参数资料
型号: PCM3794RHBTG4
厂商: TEXAS INSTRUMENTS INC
元件分类: 通信及网络
英文描述: SPECIALTY TELECOM CIRCUIT, PQCC32
封装: 5 X 5 MM, GREEN, PLASTIC, QFN-32
文件页数: 35/67页
文件大小: 1417K
代理商: PCM3794RHBTG4
www.ti.com
SLES193C – AUGUST 2006 – REVISED FEBRUARY 2007
B15
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 81
0
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
HPF1
HPF0
RMUL
RMUR
RSV
DSMC
RFM1
RFM0
IDX[6:0]: 101 0001b (51h): Register 81
HPF[1:0]: High-Pass Filter Selection
Default value: 00
PCM3793/94 has digital high-pass filter to remove dc voltage at the input of the ADC. The cutoff frequency of
the high-pass filter can be selected.
HPF [1:0]
High-Pass Filter Selection
0 0
fC = 4 Hz at 48 kHz (default)
0 1
fC = 240 Hz at 48 kHz
1 0
Reserved
1 1
High-pass filter disabled
RMUL: Digital Soft Mute Control for L-Channel ADC
RMUR: Digital Soft Mute Control for R-Channel ADC
Default value: 1
The digital output of the ADC can be independently muted or unmuted. The transition from the current volume
level to mute, or the return to the previous volume setting from mute, occurs at the rate of one 1-dB step for
each 8/fS time period. When PMUL and PMUR = 0, the digital data is increased from mute to the previous
attenuation level, and when PMUL and PMUR = 1, the digital data is decreased from the current attenuation
level to mute. In the PCM3793/94, audible zipper noise can be reduced by using zero-cross detection (register
85, ZCRS).
RMUL, RMUR = 0
Mute disabled
RMUL, RMUR = 1
Mute enabled (default)
DSMC: Waiting Time for ADC Mute Off at Power Up
Default value: 0
The ADC digital output has an optional delay after power up when DSMC = 0. It is recommended to set
DSMC = 0.
DSMC = 0
10 ms at 48 kHz (default)
DSMC = 1
No delay
RFM[1:0]: Audio Interface Selection for ADC (Digital Output)
Default value: 00
The audio interface for the ADC digital input supports I2S, right-justified, left-justified, and DSP formats.
RFM [1:0]
Audio Interface Selection for ADC Digital Output
0 0
I2S format (default)
0 1
Right-justified format
1 0
Left-justified format
1 1
DSP format
40
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