CS4218 datasheet(43/44 Pages) CIRRUS

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Appendix C: Setting CLKIN/SCLK Ratio for Desired Sample Rate

In Slave sub-modes, the CS4218 detects the ratio between the CLKIN and SCLK rates and sets the

internal sample rate accordingly. The following formula can be used to determine the ratio of CLKIN

to SCLK for any desired sample rate for both Serial Modes 3 and 4, Slave sub-modes.

CLKIN

SCLK

(256 × Fsmax)

(BPF × Fs)

where:

CLKIN = Master clock input

In SM3 Multiplier Slave sub-mode, CLKIN is replaced by 16* CLKIN.

SCLK

= Serial port bit clock.

Fsmax

= Maximum system sample rate.

= Desired sample rate.

BPF

= The number of bits per frame (256, 128, 64 or 32)

Example 1: SM3-S, Fsmax = 48 kHz, Fs = 8 kHz, BPF = 64

CLKIN

SCLK

(256 × 48000)

(64 × 8000)

12.288 MHz

512 kHz

= 24

Example 2: SM4-S, Fsmax = 8 kHz, Fs = 8 kHz, BPF = 32

CLKIN

SCLK

(256 × 8000)

(32 × 8000)

2.048 MHz

256 kHz

= 8

CS4218

DS135F1

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