CS4397

DS333F1

19

Serial Clock - SCLK

Pin 11, Input

Function:

Clocks individual bits of serial data into the SDATA pin. The required relationship between the Left/Right

clock, serial clock and serial data is defined by either the Mode Control Byte in Control Port Mode or the

M0 - M4 pins in Hardware Mode. The options are detailed in Figures 29-33

Left/Right Clock - LRCK

Pin 12, Input

Function:

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

SDATA. 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 de-

tailed in Figures 29-33

Serial Audio Data - SDATA

Pin 13, 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 inin Figures 29-33

Soft Mute - MUTE

Pin 15, Input

Function:

The analog outputs will ramp to a muted state when enabled. The ramp requires 1152 left/right clock cy-

Sample Rate

(kHz)

MCLK (MHz)

256x

384x

512x

768x

32

8.1920

12.2880

16.3840

24.5760

44.1

11.2896

16.9344

22.5792

33.8688

48

12.2880

18.4320

24.5760

36.8640

Table 4. Single Speed (16 to 50 kHz sample rates) Common Clock 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 5. Double Speed (50 to 100 kHz sample rates) Common Clock Frequencies

Sample Rate

(kHz)

MCLK (MHz)

64x

96x

128x

192x

176.4

11.2896

16.9344

22.5792

33.8688

192

12.2880

18.4320

24.5760

36.8640

Table 6. Quad Speed (100 to 200 kHz sample rates) Common Clock Frequencies