Datasheet

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PCM1774
SLAS551 – JULY 2007
Register 89
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 89 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV GMR2 GMR1 GMR0 RSV GML2 GML1 GML0
IDX[6:0]: 101 1001b (59h): Register 89
GMR[2:0]: Gain Level Control for PG6 (Gain Amplifier for Analog Input or R-Channel Bypass)
GML[2:0]: Gain Level Control for PG5 (Gain Amplifier for Analog Input or L-Channel Bypass)
Default value: 000
These bits are used for setting the gain level of the analog source to the mixing amplifier. It is recommended to
set the gain level to avoid saturation in the analog mixer.
GMR[2:0] Gain Level Control for PG6
GML[2:0] Gain Level Control for PG5
0 0 0 –21 dB (default)
0 0 1 –18 dB
0 1 0 –15 dB
0 1 1 –12 dB
1 0 0 –9 dB
1 0 1 –6 dB
1 1 0 –3 dB
1 1 1 0 dB
Register 90
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 90 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV RSV RSV RSV RSV RSV G20R G20L
IDX[6:0]: 101 1010b (5Ah): Register 90
G20R: 20-dB Boost for PG2 (Gain Amplifier for AIN1R)
Default value: 0
This bit is used to boost the microphone signal when the analog input is small.
G12R G20R PG2 GAIN
(REGISTER 124) (REGISTER 90)
0 0 0 dB (default)
0 1 20 dB
1 0 12 dB
1 1 Reserved
G20L: 20-dB Boost for PG1 (Gain Amplifier for AIN1L)
Default value: 0
This bit is used to boost the microphone signal when the analog input is small.
G12L G20L PG1 GAIN
(REGISTER 124) (REGISTER 90)
0 0 0 dB (default)
0 1 20 dB
1 0 12 dB
1 1 Reserved
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