Cirrus Logic CS42L56 - Manual (Page 22)

22 DS851F2
CS42L56
SWITCHING SPECIFICATIONS - SERIAL PORT
Inputs: Logic 0 = GND = AGND, Logic 1 = VL, LRCK, SCLK, SDOUT C
LOAD
= 15 pF.
Notes:
20. After powering up the CS42L56, RESET should be held low after the power supplies and clocks are
settled. This specification is valid with the recommended capacitor on VDFILT.
21. When the RATIO[1:0] = ‘01’, the device will periodically extend the SCLK high time to compensate for
the resulting fractional MCLK/SCLK ratio.
Parameters Symbol Min Max Units
RESET pin Low Pulse Width (Note 20) 1 - ms
MCLK Frequency
(See “Serial Port Clocking”
on page 47 )
MHz
MCLK Duty Cycle 45 55 %
Slave Mode ( Figure 8 )
Input Sample Rate (LRCK) F
s
(See “Serial Port Clocking”
on page 47 )
kHz
LRCK Duty Cycle 45 55 %
SCLK Frequency 1/t
Ps
- 68•F
s
Hz
SCLK Duty Cycle 45 55 %
LRCK Setup Time Before SCLK Rising Edge t
ss(LK-SK)
40 - ns
SDOUT Setup Time Before SCLK Rising Edge t
ss(SDO-SK)
20 - ns
SDOUT Hold Time After SCLK Rising Edge t
hs(SK-SDO)
30 - ns
SDIN Setup Time Before SCLK Rising Edge t
ss(SD-SK)
20 - ns
SDIN Hold Time After SCLK Rising Edge t
hs
20 - ns
Master Mode ( Figure 9 )
Output Sample Rate (LRCK)
F
s
(See “Serial Port Clocking”
on page 47 )
Hz
LRCK Duty Cycle 45 55 %
SCLK Frequency SCLK = MCLK mode 1/t
Pm
- 12.0000 MHz
All Other Modes 1/t
Pm
- 68•F
s
Hz
SCLK Duty Cycle RATIO[4:0] = ‘xxx00’ or ‘xxx11’ 45 55 %
RATIO[4:0] = ‘xxx01’ (Note 21) 33 66 %
LRCK Time Before SCLK Falling Edge t
sm(LK-SK)
- ±2 ns
SDOUT Setup Time Before SCLK Rising Edge t
sm(SDO-SK)
20 - ns
SDOUT Hold Time After SCLK Rising Edge t
hm(SK-SDO)
30 - ns
SDIN Setup Time Before SCLK Rising Edge t
sm(SD-SK)
20 - ns
SDIN Hold Time After SCLK Rising Edge t
hm
20 - ns
Figure 8. Serial Port Timing (Slave Mode) Figure 9. Serial Port Timing (Master Mode)
t
hs(SK-SDO)
//
//
//
//
//
//
//
//
t
ss(SD-SK)
MSB
MSB
LRCK
SCLK
SDOUT
SDIN
t
ss(LK-SK)
t
P
t
hs
t
ss(SDO-SK)
//
//
//
//
t
hm(SK-SDO)
//
//
//
//
//
//
//
//
t
sm(SD-SK)
MSB
MSB
LRCK
SCLK
SDOUT
SDIN
t
Pm
t
hm
t
sm(SDO-SK)
//
//
//
//
//
//
t
sm(LK-SK)