PCM3793 Datasheet, PDF (52/63 Pages) Burr-Brown (TI) – 16-Bit, Low-Power Stereo Audio CODEC With Microphone Bias, Headphone, and Digital Speaker Amplifier

PCM3793
PCM3794
SLES193A – AUGUST 2006 – REVISED SEPTEMBER 2006
Register 90
B15
B14
B13
B12
0
IDX6 IDX5 IDX4
B11
IDX3
B10
IDX2
B9
IDX1
B8
IDX0
B7
RSV
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B6
RSV
B5
CMT1
B4
CMT0
B3
RSV
B2
RSV
B1
G20R
B0
G20L
IDX[6:0]: 1011010b (5Ah): Register 90
CMT[1:0]: V_COM Ramp Up/Down Time Control
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.
CMT[1:0]
00
01
10
11
V_COM Ramp Up/Down Time Control
Nominal; R_CMT = 60 kΩ (default)
Slow; R_CMT = 120 kΩ
Fast; R_CMT = 30 kΩ
Fastest; R_CMT = 2.73 kΩ
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.
G20R = 0
G20R = 1
0 dB (default)
20-dB boost
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.
G20L = 0
G20L = 1
0 dB (default)
20-dB boost
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