CS5342

16

DS608PP2

4.2.1

Operation as a Clock Master

As a clock master, LRCK and SCLK operate as outputs. The left/right and serial clocks are internally derived from

the master clock with the left/right clock equal to Fs and the serial clock equal to 64x Fs, as shown in Figure 18.

4.2.2

Operation as a Clock Slave

LRCK and SCLK operate as inputs in clock slave mode. It is recommended that the left/right clock be

synchronously derived from the master clock and must be equal to Fs. It is also recommended that the serial clock

be synchronously derived from the master clock and equal to 48x Fs or 64x Fs in Single-Speed Mode. In Double-

Speed and Quad-Speed Modes the serial clock must be derived synchronously from the master clock and equal to

48x Fs. Additionally, Quad-Speed Slave Mode is only specified for operation with a VA and VD at 5 V,

±5%.

A unique feature of the CS5342 is the automatic selection of either Single, Double or Quad speed mode when op-

erating as a clock slave. The auto-mode select feature negates the need to configure the Mode pins to correspond

to the desired mode. The auto-mode selection feature supports all standard audio sample rates from 2 to 200 kHz.

However, there are ranges of non-standard audio sample rates that are not supported when operating with a fast

MCLK (768x, 384x, and 192x for Single, Double, and Quad Speed Modes respectively). Please refer to Table 1 on

page 15 for supported sample rate ranges.

÷ 128

÷ 256

÷ 64

M[1:0]

LRCK Output

(Equal to Fs)

Single

Speed

Quad

Speed

Double

Speed

00

01

10

÷ 2

÷ 4

÷ 1

SCLK Output

Single

Speed

Quad

Speed

Double

Speed

00

01

10

÷ 3

÷ 1.5

0

1

MCLK

Auto-Select

Figure 18. CS5342 Master Mode Clocking