PCM3793A
PCM3794A
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SLAS529A–JANUARY 2007–REVISED FEBRUARY 2007
Register 83
B15
0
B14
B13
B12
B11
B10
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
RLV0
Register 83
IDX6
IDX5
IDX4
IDX3
IDX2
IDX1
IDX0
RALC
RSV
RRTC
RATC
RCP1
RCP0
RLV1
IDX[6:0]: 101 0011b (53h): Register 83
RALC: Automatic Level Control (ALC) Enable for Recording
Default value: 0
Automatic level control can be enabled with some parameters for microphone input or lower analog source level.
RALC = 0
RALC = 1
Disable (default)
Enable
RRTC: ALC Recovery Time Control for Recording
Default value: 0
This bit is used to select the recovery time for the ALC. The response is shown in Figure 37.
RRTC = 0
RRTC = 1
3.4 s (default)
13.6 s
RATC: ALC Attack Time Control for Recording
Default value: 0
This bit is used to select the attack time for the ALC. The response is shown in Figure 37.
RATC = 0
RATC = 1
1 ms (default)
2 ms
Recovery
Attack
Input Data
Input Data
+FS
+FS
–FS
+FS
–FS
Output Data
Output Data
Recovery Time
Attack Time
+FS
–FS
–FS
T0166-01
Figure 37. Attack and Recovery Time Response
44
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