CS4350 datasheet(30/41 Pages) CIRRUS

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DS691F1

CS4350

8.2.2

De-Emphasis Control (DEM[1:0]) 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 standard

μs/50 μs digital de-emphasis filter response at 32, 44.1

or 48 kHz sample rates. (See Figure 21)

Note:

De-emphasis is only available in Single-Speed

Mode

8.2.3

Functional Mode (FM[1:0]) Bits 1-0

Default = 00

00 - Auto speed mode detect

01 - Single-Speed Mode (30 to 54 kHz sample rates)

10 - Double-Speed Mode (50 to 108 kHz sample rates)

11 - Quad-Speed Mode (100 to 216 kHz sample rates)

Function:

Selects the required range of input sample rates or auto speed mode.

8.3

Volume Mixing and Inversion Control - Register 03h

8.3.1

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.

8.3.2

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.

This function is only available for Left Justified, Right Justified 16, and Right Justified 24 data formats.

543

VOLB=A

INVERT_A

INVERT_B

Reserved

ATAPI3

ATAPI2

ATAPI1

ATAPI0

001

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

Figure 21. De-Emphasis Curve

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