Cirrus Logic CS5351 - Manual (Page 16)

16 DS565F2
CS5351
4. APPLICATIONS
4.1 Operational Mode/Sample Rate Range Select
The output sample rate, Fs, can be adjusted from 2 kHz to 204 kHz. The CS5351 must be set to the proper
speed mode via the mode pins, M1 and M0. Refer to
Table 1 .
4.2 System Clocking
The device supports operation in either Master Mode, where the left/right and serial clocks are synchronous-
ly generated on-chip, or Slave Mode, which requires external generation of the left/right and serial clocks.
The device also includes a master clock divider in Master Mode where the master clock will be internally
divided prior to any other internal circuitry when MDIV is enabled, set to logic 1. In Slave Mode, the MDIV
pin needs to be disabled, set to logic 0.
4.2.1 Slave Mode
LRCK and SCLK operate as inputs in Slave Mode. The left/right clock must be synchronously derived
from the master clock and be equal to Fs. It is also recommended that the serial clock be synchronously
derived from the master clock and be equal to 64x Fs to maximize system performance. Refer to
Table 2
for required clock ratios.
Table 2. CS5351 Slave Mode Clock Ratios
M1 (Pin 14) M0 (Pin 13) MODE Output Sample Rate (Fs)
0 0 Single-Speed Mode 2 kHz - 51 kHz
0 1 Double-Speed Mode 50 kHz - 102 kHz
1 0 Quad-Speed Mode 100 kHz - 204 kHz
1 1 Reserved
Table 1. CS5351 Mode Control
Single-Speed Mode
Fs = 2 kHz to 51 kHz
Double-Speed Mode
Fs = 50 kHz to 102 kHz
Quad-Speed Mode
Fs = 100 kHz to 204 kHz
MCLK/LRCK Ratio 256x, 512x 128x, 256x 128x
SCLK/LRCK Ratio 32x, 64x, 128x 32x, 64x 32x, 64x