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DACx – DAC Operation Control

DM12 – Digital De-Emphasis Function Control

DMF[1:0] – Sampling Frequency Selection for the De-Emphasis Function

PCM1742

SBAS176A – DECEMBER 2000 – REVISED APRIL 2005

B15

B14

B13

B12

B11

B10

B9

B8

B7

B6

B5

B4

B3

B2

B1

B0

REGISTER 19

0

IDX6

IDX5

IDX4

IDX3

IDX2

IDX1

IDX0

RSV

DMF1

DMF0

DM12

RSV

RSV

DAC2

DAC1

where x = 1 or 2, corresponding to the DAC output VOUTL (x = 1) or VOUTR (x = 2).

Default value: 0

DACx = 0

DAC operation enabled (default)

DACx = 1

DAC operation disabled

The DAC operation controls are used to enable and disable the DAC outputs, VOUTL and VOUTR. When DACx =

0, the corresponding output generates the audio waveform dictated by the data present on the DATA pin. When

DACx = 1, the corresponding output is set to the bipolar zero level, or VCC/2.

Default value: 0

DM12 = 0

De-emphasis disabled (default)

DM12 = 1

De-emphasis enabled

The DM12 bit is used to enable or disable the digital de-emphasis function. Refer to the Typical Performance

Curves section of this data sheet for more information.

Default value: 00

DMF[1:0]

De-Emphasis Sample Rate Selection

00

44.1 kHz (default)

01

48 kHz

10

32 kHz

11

Reserved

The DMF[1:0] bits select the sampling frequency used for the digital de-emphasis function when it is enabled.

19