CS4392 datasheet(19/42 Pages) CIRRUS

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CS4392

DS459PP2

DSD Mode - The relationship between the oversampling ratio of the DSD audio data and the required

Master clock to DSD data rate is defined by the Digital interface Format pins. Note that the Functional

Mode registers must be set to DSD Mode. See 9 for register options.

6.1.3

De-Emphasis Control (Bits 3:2)

Function:

Implementation of the standard 15

µs/50 µs digital de-emphasis filter response, Figure 7, requires re-

configuration of the digital filter to maintain the proper filter response for 32, 44.1 or 48 kHz sample

rates. NOTE: De-emphasis is available only in Single-Speed Mode. See 10 below.

6.1.4

Functional Mode (Bits 1:0)

Function:

Selects the required range of input sample rates or DSD Mode. See Table 11.

DIF2

DIF1

DIFO

DESCRIPTION

64x oversampled DSD data with a 4x MCLK to DSD data rate (default)

64x oversampled DSD data with a 6x MCLK to DSD data rate

64x oversampled DSD data with a 8x MCLK to DSD data rate

64x oversampled DSD data with a 12x MCLK to DSD data rate

128x oversampled DSD data with a 2x MCLK to DSD data rate

128x oversampled DSD data with a 3x MCLK to DSD data rate

128x oversampled DSD data with a 4x MCLK to DSD data rate

128x oversampled DSD data with a 6x MCLK to DSD data rate

Table 9. Digital Interface Formats - DSD Mode

DEM1

DEMO

DESCRIPTION

Disabled (default)

44.1 kHz de-emphasis

48 kHz de-emphasis

32 kHz de-emphasis

Table 10. De-Emphasis Mode Selection

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

Figure 10. De-Emphasis Curve

FM1

FM0

MODE

Single-Speed Mode: 4 to 50 kHz sample rates

(default)

Double-Speed Mode: 50 to 100 kHz sample rates

Quad-Speed Mode: 100 to 200 kHz sample rates

Direct Stream Digital Mode

Table 11. Functional Mode Selection

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