Cirrus Logic CS5344 - Manual (Page 12)

12 DS687F4
CS5343/4
Draft
2/1/11
4. APPLICATIONS
4.1 Operation as Clock Master or Slave
The CS5343/4 supports operation as either a clock master or slave. As a clock master, the left/right and
serial clocks are synchronously generated on-chip and output on the LRCK and SCLK pins, respectively.
As a clock slave, the LRCK and SCLK pins are always inputs and require external generation of the left/right
and serial clocks. The selection of clock master or slave is made via a 10 k
 pull-up resistor from SDOUT
to VA for Master Mode selection or via a 10 k
pull-down resistor from SDOUT to GND for Slave Mode se-
lection, as shown in Table 1 .
4.1.1 Slave Mode Operation
A unique feature of the CS5343/4 is the automatic selection of either Single- or Double-Speed Mode when
acting as a clock slave. The auto-mode selection feature supports all standard audio sample rates from
4 to 108 kHz. Please refer to
Table 2 for supported sample rate ranges in Slave Mode.
Table 2. Speed Modes and the Associated Sample Rates (Fs) in Slave Mode
Mode Selection
Master Mode 10 k
 pull-up resistor from SDOUT to VA
Slave Mode 10 k
pull-down resistor from SDOUT to GND
Table 1. Master/Slave Mode Selection
Speed Mode
MCLK/LRCK
Ratio
SCLK/LRCK
Ratio
Input Sample Rate Range (kHz)
Single-Speed Mode
256x 64 4 - 54
512x 64 4 - 54
384x 48, 64 4 - 54
768x 48, 64 4 - 54
Double-Speed Mode
128x 64 86 - 108
256x 64 86 - 108
192x 48, 64 86 - 108
384x 48, 64 86 - 108