CS4341

DS298F5

17

4.

APPLICATIONS

4.1

Sample Rate Range/Operational Mode

The device operates in one of two operational modes determined by the Master Clock to Left/Right Clock

ratio (see section 4.2). Sample rates outside the specified range for each mode are not supported.

4.2

System Clocking

The device requires external generation of the master (MCLK) and left/right (LRCK) clocks. The device

also requires external generation of the serial clock (SCLK) if the internal serial clock is not used. The

LRCK, defined also as the input sample rate Fs, must be synchronously derived from MCLK according to

specified ratios. The specified ratios of MCLK to LRCK, along with several standard audio sample rates

and the required MCLK frequency, are illustrated in Tables 2 and 3.

*Requires MCLKDIV bit = 1 in the MCLK Control (address 00h) register.

4.2.1

Internal Serial Clock Mode

The device will enter the Internal Serial Clock Mode if no low to high transitions are detected on

the SCLK pin for 2 consecutive periods of LRCK. In this mode, the SCLK is internally derived and

synchronous with MCLK and LRCK. The SCLK/LRCK ratio is either 32, 48, or 64 depending upon

the MCLK/LRCK ratio and the Digital Interface Format selection (see Table 4).

Operation in the Internal Serial Clock mode is identical to operation with an external SCLK syn-

chronized with LRCK; however, External SCLK mode is recommended for system clocking appli-

cations.

Input Sample Rate (Fs)

MODE

4 kHz - 50 kHz

Single-Speed Mode

50 kHz - 100 kHz

Double-Speed Mode

Table 1. CS4341 Speed Modes

Sample Rate

(kHz)

MCLK (MHz)

256x

384x

512x

768x*

1024x*

32

8.1920

12.2880

16.3840

24.5760

32.768

44.1

11.2896

16.9344

22.5792

33.8688

45.1584

48

12.2880

18.4320

24.5760

36.8640

49.1520

Table 2. Single-Speed Mode Standard Frequencies

Sample Rate

(kHz)

MCLK (MHz)

128x

192x

256x*

384x*

64

8.1920

12.2880

16.3840

24.5760

88.2

11.2896

16.9344

22.5792

33.8688

96

12.2880

18.4320

24.5760

36.8640

Table 3. Double-Speed Mode Standard Frequencies