PCM3793RHB BURR-BROWN [Burr-Brown Corporation], PCM3793RHB Datasheet - Page 52

• Manufacturer Part Number: PCM3793RHB
• Description: 16-Bit, Low-Power Stereo Audio CODEC With Microphone Bias, Headphone, and Digital Speaker Amplifier
• Manufacturer: BURR-BROWN [Burr-Brown Corporation]

PCM3793
PCM3794
SLES193A – AUGUST 2006 – REVISED SEPTEMBER 2006
52
IDX[6:0]: 1011010b (5Ah): Register 90
CMT[1:0]: V
Default value: 00
These bits are used for selecting ramp up/down time from ground level to the common-voltage level or from the
common-voltage to ground level during the power up/down sequence, in order to reduce audible pop noise.
G20R: 20-dB Boost for PG2 (Gain Amplifier for AIN1R, AIN2R, and AIN3R)
Default value: 0
This bit is used to boost the microphone signal when the analog input is small.
G20L: 20-dB Boost for PG1 (Gain Amplifier for AIN1L, AIN2L, and AIN3L)
Default value: 0
This bit is used to boost the microphone signal when the analog input is small.
Register 90
CMT[1:0]
0 0
0 1
1 0
1 1
G20R = 0
G20R = 1
G20L = 0
G20L = 1
COM
B15
0
Ramp Up/Down Time Control
IDX6
B14
IDX5
B13
IDX4
B12
V
Nominal; R
Slow; R
Fast; R
Fastest; R
0 dB (default)
20-dB boost
0 dB (default)
20-dB boost
COM
IDX3
B11
Ramp Up/Down Time Control
CMT
CMT
CMT
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CMT
= 30 k
= 120 k
IDX2
B10
= 2.73 k
= 60 k
IDX1
B9
(default)
IDX0
B8
RSV
B7
RSV
B6
CMT1
B5
CMT0
B4
RSV
B3
RSV
B2
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G20R
B1
G20L
B0