Cirrus-logic CS4397 User Manual download pdf (Page 19)

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

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 33 34

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Cirrus-logic CS4397 User Manual Page 19

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