CS4351 datasheet(17/37 Pages) CIRRUS

17 / 37 page

DS566F1

CS4351

least 32 cycles per LRCK period in format 2, 48 cycles in format 3, 40 cycles in format 4, and 36 cycles

in format 5.

4.4

De-Emphasis Control

The device includes on-chip digital de-emphasis. Figure 8 shows the de-emphasis curve for Fs equal to 44.1

kHz. The frequency response of the de-emphasis curve will scale proportionally with changes in sample

rate, Fs.

Note:

De-emphasis is only available in Single-Speed Mode.

LR C K

SC L K

Left C ha nnel

Righ t C ha n nel

SDIN

+3 +2 +1

+5 +4

MSB

-1 -2 -3 -4 -5

+3 +2 +1

+5 +4

-1 -2 -3 -4

LSB

MSB

LSB

Figure 5. Left-Justified up to 24-Bit Data

LR C K

SCL K

Left C ha nnel

Rig h t Channel

SDIN

+3 +2 +1

+5 +4

MSB

-1 -2 -3 -4 -5

+3 +2 +1

+5 +4

-1 -2 -3 -4

MSB

LSB

Figure 6. I²S, up to 24-Bit Data

LRCK

SCLK

Left Chan ne l

SDIN

-6 -5 -4 -3 -2 -1

-7

+1 +2 +3 +4 +5

MSB

R ight Cha nne l

LSB

MSB

+1 +2 +3 +4 +5

LSB

-6 -5 -4 -3 -2 -1

-7

MSB

Figure 7. Right-Justified Data

Gain

-10dB

0dB

Frequency

T2 = 15 µs

T1=50 µs

3.183 kHz

10.61 kHz

Figure 8. De-Emphasis Curve

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