PCM1793

SLES076A − MARCH 2003 − REVISED JANUARY 2004

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18

FUNCTION DESCRIPTIONS

Zero Detect

When the PCM1793 detects that the audio input data in the L-channel or R-channel is continuously zero for 1024

Soft Mute

The PCM1793 supports mute operation. When MUTE (pin 4) is set to HIGH, both analog outputs are transitioned

of the DAC output.

De-Emphasis

The PCM1793 has de-emphasis filters for sampling frequencies of 32 kHz, 44.1 kHz, and 48 kHz. DEMP1 (pin 25)

and DEMP0 (pin 24) select the sampling frequency for which de-emphasis filtering is performed, as shown in Table 3.

Table 3. De-Emphasis Control

DEMP1

PIN 25

DEMP0

PIN 24

DE-EMPHASIS FUNCTION

LOW

LOW

Disabled

LOW

HIGH

48 kHz

HIGH

LOW

44.1 kHz

HIGH

HIGH

32 kHz