CS4364 datasheet(36/50 Pages) CIRRUS

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DS619A1

CS4364

When set to 0 (default), DSD input data is sent to the DSD processor for filtering and volume control func-

tions.

When set to 1, DSD input data is sent directly to the switched capacitor DACs for a pure DSD conversion.

In this mode the full scale DSD and PCM levels will not be matched (see Section 2), the dynamic range

performance may be reduced, the volume control is inactive, and the 50 kHz low pass filter is not available

(see Section 2 for filter specifications).

5.4.3

Static DSD Detect (STATIC_DSD)

Function:

When set to 1 (default), the DSD processor checks for 28 consecutive zeroes or ones and, if detected,

sends a mute signal to the DACs. The MUTEC pins will eventually go active according to the DAMUTE

When set to 0, this function is disabled.

5.4.4

Invalid DSD Detect (INVALID_DSD)

Function:

When set to 1, the DSD processor checks for greater than 24 out of 28 bits of the same value and, if de-

tected, will attenuate the data sent to the DACs. The MUTEC pins go active according to the DAMUTE

When set to 0 (default), this function is disabled.

5.4.5

DSD Phase Modulation Mode Select (DSD_PM_MODE)

Function:

When set to 0 (default), the 128Fs (BCKA) clock should be input to DSD_SCLK for phase modulation

mode. (See Figure 18 on page 25.)

When set to 1, the 64Fs (BCKD) clock should be input to DSD_SCLK for phase modulation mode.

5.4.6

DSD Phase Modulation Mode Enable (DSD_PM_EN)

Function:

When set to 1, DSD phase modulation input mode is enabled and the DSD_PM_MODE bit should be set

accordingly.

When set to 0 (default), this function is disabled (DSD normal mode).

5.5

Filter Control (address 05h)

5.5.1

Interpolation Filter Select (FILT_SEL)

Function:

When set to 0 (default), the Interpolation Filter has a fast roll off.

543

Reserved

FILT_SEL

000

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