Datasheet

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PCM1870
SLAS544A – MAY 2007 – REVISED SEPTEMBER 2007
ZCRS: Zero Cross for Digital Attenuation/Mute and Analog Gain Setting
Default value: 0
This bit is used to enable the zero-cross detector, which reduces zipper noise while the digital soft mute or
analog gain setting is being changed. If no zero-cross data is input for a 512/f
S
period (10.6 ms at a 48-kHz
sampling rate), then a time-out occurs and the PCM1870 starts changing the attenuation, gain, or volume level.
The zero-cross detector cannot be used with continuous-zero and dc data.
ZCRS = 0 Zero cross disabled (default)
ZCRS = 1 Zero cross enabled
Register 87
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 87 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AD2S RSV AIR1 AIR0 RSV RSV AIL1 AIL0
IDX[6:0]: 101 0111b (57h) Register 87
AD2S: Differential Amplifier Selector (MUX3 and MUX4)
Default value: 0
This bit is used to select whether a single-ended amplifier or differential amplifier (D2S) is used as the input for
the ADC. MUX3 and MUX4 use the single-ended input when AD2S = 0. MUX3 and MUX4 use the monaural
differential input when AD2S = 1.
AD2S = 0 Single-ended amplifier (default)
AD2S = 1 Differential amplifier
AIL[1:0]: AIN1L and AIN2L Selector (MUX1)
Default value: 00
MUX1 selects the analog input, AIN1L or AIN2L.
AIL[1:0] AIN L-channel Select
0 0 Disconnect (default)
0 1 AIN1L
1 0 AIN2L
1 1 Reserved
AIR[1:0]: AIN1R and AIN2R Selector (MUX2)
Default value: 00
MUX2 selects the analog input, AIN1R or AIN2R.
AIR[1:0] AIN R-channel Select
0 0 Disconnect (default)
0 1 AIN1R
1 0 AIN2R
1 1 Reserved
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