CS43L41

DS473PP1

23

Master Clock - MCLK

Pin 5, Input

Function:

The master clock frequency must be either 256x, 384x, 512x, 768x or 1024x the input sample rate in Base

Rate Mode (BRM) and 128x, 192x, 256x or 384x the input sample rate in High Rate Mode (HRM). Note

that some multiplication factors require setting the MCLKDIV bit in the MCLK Control Register. Table 12

illustrates several standard audio sample rates and the required master clock frequencies.

Left/Right Clock - LRCK

Pin 4, Input

Function:

The Left/Right clock determines which channel is currently being input on the serial audio data input, SDA-

TA. The frequency of the Left/Right clock must be at the input sample rate. Audio samples in Left/Right

sample pairs will be simultaneously output from the digital-to-analog converter whereas Right/Left pairs

will exhibit a one sample period difference. The required relationship between the Left/Right clock, serial

clock and serial data is defined by the Mode Control Byte and the options are detailed in Figures 20-26.

Serial Audio Data - SDATA

Pin 2, Input

Function:

Two’s complement MSB-first serial data is input on this pin. The data is clocked into SDATA via the serial

clock and the channel is determined by the Left/Right clock. The required relationship between the

Left/Right clock, serial clock and serial data is defined by the Mode Control Byte and the options are de-

tailed in Figures 20-26.

Sample Rate

(kHz)

MCLK (MHz)

HRM

BRM

128x

192x

256x*

384x*

256x

384x

512x

768x*

1024x*

32

4.0960

6.1440

8.1920

12.2880

8.1920

12.2880

16.3840

24.5760

32.7680

44.1

5.6448

8.4672

11.2896

16.9344

11.2896

16.9344

22.5792

32.7680

45.1584

48

6.1440

9.2160

12.2880

18.4320

12.2880

18.4320

24.5760

36.8640

49.1520

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

-

-

-

-

-

* Requires MCLKDIV bit = 1 in MCLK Control Register (address 00h)

Table 12. Common Clock Frequencies