ADAU1781
Rev. B| Page 11 of 92
DIGITAL TIMING SPECIFICATIONS
25°C < TA < +85°C, IOVDD = 1.62 V to 3.63 V, unless otherwise specified.
Table 7. Digital Timing
Limit
Parameter
t
MIN
t
MAX
Unit
Description
MASTER CLOCK
t
MP
50
90.9
ns
Master clock (MCLK) period (that is, period of the signal input to MCKI).
Duty Cycle
30
70
%
SERIAL PORT
t
BIL
10
ns
BCLK pulse width low.
t
BIH
10
ns
BCLK pulse width high.
t
LIS
5
ns
LRCLK setup. Time to BCLK rising.
t
LIH
5
ns
LRCLK hold. Time from BCLK rising.
t
SIS
5
ns
DAC_SDATA setup. Time to BCLK rising.
t
SIH
5
ns
DAC_SDATA hold. Time from BCLK rising.
t
SODM
70
ns
ADC_SDATA delay. Time from BCLK falling in master mode.
SPI PORT
f
CCLK,R
5
MHz
CCLK frequency, read operation, IOVDD = 1.8 V ± 10%.
f
CCLK,R
10
MHz
CCLK frequency, read operation, IOVDD = 3.3 V ± 10%.
f
CCLK,W
25
MHz
CCLK frequency, write operation, IOVDD = 1.8 V ± 10%.
f
CCLK,W
25
MHz
CCLK frequency, write operation, IOVDD = 3.3 V ± 10%.
t
CCPL
10
ns
CCLK pulse width low.
t
CCPH
10
ns
CCLK pulse width high.
t
CLS
10
ns
CLATCH setup. Time to CCLK rising.
t
CLH
5
ns
CLATCH hold. Time from CCLK rising.
t
CLPH
10
ns
CLATCH pulse width high.
t
CDS
5
ns
CDATA setup. Time to CCLK rising.
t
CDH
5
ns
CDATA hold. Time from CCLK rising.
t
COD
70
COUT delay from CCLK edge to valid data, IOVDD = 1.8 V ± 10%.
40
ns
COUT delay from CCLK edge to valid data, IOVDD = 3.3 V ± 10%.
I2C PORT
f
SCL
400
kHz
SCL frequency.
t
SCLH
0.6
s
SCL high.
t
SCLL
1.3
s
SCL low.
t
SCS
0.6
s
Setup time; relevant for repeated start condition.
t
SCH
0.6
s
Hold time. After this period, the first clock is generated.
t
DS
100
ns
Data setup time.
t
SCR
300
ns
SCL rise time.
t
SCF
300
ns
SCL fall time.
t
SDR
300
ns
SDA rise time.
t
SDF
300
ns
SDA fall time.
t
BFT
0.6
s
Bus-free time. Time between stop and start.
DIGITAL MICROPHONE
R
L = 1 M, CL = 14 pF.
t
DCF
10
ns
Digital microphone clock fall time.
t
DCR
10
ns
Digital microphone clock rise time.
t
DDV
22
30
ns
Digital microphone delay time for valid data.
t
DDH
0
12
ns
Digital microphone delay time for data three-stated.