Cirrus Logic CS5368 - Manual (Page 15)

DS624F5 15
CS5368
SERIAL AUDIO INTERFACE - I²S/LJ TIMING
The serial audio port is a three-pin interface consisting of SCLK, LRCK and SDOUT.
Logic "0" = GND = 0 V; Logic "1" = VLS; C
L
= 20 pF, timing threshold is 50% of VLS.
Notes:
1. Duty cycle of generated SCLK depends on duty cycle of received MCLK as specified under “System
Clocking” on page 10 .
2. CLKMODE functionality described in Section 4.6.3 "Master Mode Clock Dividers" on page 24 .
3. In Slave Mode, the SCLK/LRCK ratio can be set according to preference. However, chip performance
is guaranteed only when using the ratios in Section 4.7 Master and Slave Clock Frequencies on page
25 .
Figure 3. I²S/LJ Timing
Parameter Symbol Min Typ Max Unit
Sample Rates Single-Speed Mode
Double-Speed Mode
Quad-Speed Mode
-
2
54
108
-
54
108
216 kHz
Master Mode
SCLK Frequency
SCLK Period
1/(64*216 kHz)
SCLK Duty Cycle (Note 1) (CLKMODE = 0) (Note 2)
(CLKMODE = 1) (Note 2)
-
t
PERIOD
t
HIGH
t
HIGH
64*Fs
72.3
40
28
-
-
50
33
64*Fs
-
60
38
Hz
ns
%
%
LRCK setup before SCLK rising
LRCK hold after SCLK rising
t
SETUP1
t
HOLD1
20
20
- - ns
SDOUT setup before SCLK rising
SDOUT hold after SCLK rising (VLS = 1.8 V)
after SCLK rising (VLS = 3.3 V)
after SCLK rising (VLS = 5 V)
t
SETUP2
t
HOLD2
t
HOLD2
t
HOLD2
10
20
10
5
- - ns
Slave Mode
SCLK Frequency (Note 3)
SCLK Period 1/(64*216 kHz)
SCLK Duty Cycle
-
t
PERIOD
t
HIGH
-
72.3
28
64*Fs
-
-
-
-
65
Hz
ns
%
LRCK setup before SCLK rising
LRCK hold after SCLK rising
t
SETUP1
t
HOLD1
20
20
- - ns
SDOUT setup before SCLK rising (VLS = 1.8 V)
before SCLK rising (VLS = 3.3 V)
before SCLK rising (VLS = 5 V)
SDOUT hold after SCLK rising (VLS = 1.8 V)
after SCLK rising (VLS = 3.3 V)
after SCLK rising (VLS = 5 V)
t
SETUP2
t
SETUP2
t
SETUP2
t
HOLD2
t
HOLD2
t
HOLD2
4
10
10
20
10
5
- - ns
LRCK
SDOUT
SCLK
data
channel channel
data
t
HOLD2
t
SET UP2
t
HOLD1
t
SET UP1
t
PERIOD
t
HIGH