PCM1870 datasheet(34/52 Pages) TI2

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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/fS 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

B15

B14

B13

B12

B11

B10

IDX6

IDX5

IDX4

IDX3

IDX2

IDX1

IDX0

AD2S

RSV

AIR1

AIR0

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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