CDB4351 datasheet(29/41 Pages) CIRRUS

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CS4351

DS566PP2

6.2.2 DE-EMPHASIS CONTROL (DEM1:0) BITS 3-2.

Default = 0

00 - No De-emphasis

01 - 44.1 kHz De-emphasis

10 - 48 kHz De-emphasis

11 - 32 kHz De-emphasis

Function:

Selects the appropriate digital filter to maintain the stan-

dard 15

µs/50 µs digital de-emphasis filter response at

32, 44.1 or 48 kHz sample rates. (see Figure 11)

Note: De-emphasis is only available in Single Speed Mode

6.2.3 FUNCTIONAL MODE (FM) BITS 1-0

Default = 00

00 - Auto speed mode detect

01 - Single-Speed Mode (4 to 50 kHz sample rates)

10 - Double-Speed Mode (50 to 100 kHz sample rates)

11 - Quad-Speed Mode (100 to 200 kHz sample rates)

Function:

Selects the required range of input sample rates or DSD Mode.

6.3

Volume Mixing and Inversion Control - Register 03h

6.3.1 CHANNEL A VOLUME = CHANNEL B VOLUME (VOLB=A) BIT 7

Function:

When set to 0 (default) the AOUTA and AOUTB volume levels are independently controlled by the A and

the B Channel Volume Control Bytes.

When set to 1 the volume on both AOUTA and AOUTB are determined by the A Channel Attenuation and

Volume Control Bytes, and the B Channel Bytes are ignored.

6.3.2 INVERT SIGNAL POLARITY (INVERT_A) BIT 6

Function:

When set to 1, this bit inverts the signal polarity of channel A.

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

VOLB=A

INVERT A

INVERT B

Reserved

ATAPI3

ATAPI2

ATAPI1

ATAPI0

000

Figure 11. De-Emphasis Curve

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

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