Switching characteristics - pcm, Figure 1. serial audio interface timing, Figure 2. tdm serial audio interface timing – Cirrus Logic CS4385 User Manual
Page 15: Cs4385 switching characteristics - pcm
DS671F2
15
CS4385
SWITCHING CHARACTERISTICS - PCM
Inputs: Logic 0 = GND, Logic 1 = VLS, C
L
= 20 pF.
Notes:
14. After powering up, RST should be held low until after the power supplies and clocks are settled.
-
for suggested MCLK frequencies.
16. Not valid for TDM Mode.
17. MSB of CH1 is always the second SCLK rising edge following LRCK rising edge.
Parameters Symbol
Min
Max
Units
RST pin Low Pulse Width
1
-
ms
MCLK Frequency
1.024
55.2
MHz
MCLK Duty Cycle
45
55
%
Input Sample Rate - LRCK (Manual selection)
Single-Speed Mode
Double-Speed Mode
Quad-Speed Mode
F
s
F
s
F
s
4
50
100
54
108
216
kHz
kHz
kHz
Input Sample Rate - LRCK (Auto detect)
Single-Speed Mode
Double-Speed Mode
Quad-Speed Mode
Fs
Fs
Fs
4
84
170
54
108
216
kHz
kHz
kHz
LRCK Duty Cycle
45
55
%
SCLK Duty Cycle
45
55
%
SCLK High Time
t
sckh
8
-
ns
SCLK Low Time
t
sckl
8
-
ns
LRCK Edge to SCLK Rising Edge
t
lcks
5
-
ns
SCLK Rising Edge to LRCK Falling Edge
t
lckd
5
-
ns
TDM LRCK hightime pulse
t
lpw
1/f
SCLK
7/f
SCLK
ns
SDIN Setup Time Before SCLK Rising Edge
t
ds
3
-
ns
SDIN Hold Time After SCLK Rising Edge
t
dh
5
-
ns
SDINx
t
ds
SCLK
LRCK
MSB
t
dh
t
sckh
t
sckl
t
lcks
MSB-1
Figure 1. Serial Audio Interface Timing
s c k h
s c k l
t
t
S D I N 1
d h
t
d s
t
S C L K
L R C K
lc k s
t
M S B
M S B - 1
lp w
t
lc k s
t
lc k d
t
Figure 2. TDM Serial Audio Interface Timing