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AD7723
Rev. C | Page 6 of 32
TIMING SPECIFICATIONS
AVDD = DVDD = 5 V ± 5%; AGND = AGND1 = DGND = 0 V; fCLKIN = 19.2 MHz; CL = 50 pF; SFMT = logic low or high, CFMT = logic low
or high; TA = TMIN to TMAX, unless otherwise noted.
Table 2.
Parameter
Symbol
Min
Typ
Max
Unit
CLKIN Frequency
fCLK
1
19.2
MHz
CLKIN Period (tCLK – 1/fCLK)
t1
0.052
1
s
CLKIN Low Pulse Width
t2
0.45 × t1
0.55 × t1
CLKIN High Pulse Width
t3
0.45 × t1
0.55 × t1
CLKIN Rise Time
t4
5
ns
CLKIN Fall Time
t5
5
ns
FSI Setup Time
t6
0
5
ns
FSI Hold Time
t7
0
5
ns
t8
1
tCLK
CLKIN to SCO Delay
t9
25
40
ns
t10
2
tCLK
t10
1
tCLK
SCO Transition to FSO High Delay
t11
0
5
ns
SCO Transition to FSO Low Delay
t12
0
5
ns
SCO Transition to SDO Valid Delay
t13
5
12
ns
t14
60
tCLK + t2
SDO Enable Delay Time
t15
5
20
ns
SDO Disable Delay Time
t16
5
20
ns
t17
2
tCLK
t18
16/32
tCLK
CLKIN to DRDY Transition
t19
35
50
ns
CLKIN to DATA Valid
t20
20
35
ns
CS/RD Setup Time to CLKIN
t21
0
ns
CS/RD Hold Time to CLKIN
t22
20
ns
Data Access Time
t23
20
35
ns
Bus Relinquish Time
t24
20
35
ns
SYNC Input Pulse Width
t25
1
tCLK
SYNC Low Time before CLKIN Rising
t26
0
ns
DRDY High Delay after Rising SYNC
t27
25
35
ns
DRDY Low Delay after SYNC Low
t28
2049
tCLK
1 FSO pulses are gated by the release of FSI (going low).
2 Guaranteed by design.
3 Frame sync is initiated on the falling edge of CLKIN.
IOL
1.6mA
1.6V
CL
50pF
TO
OUTPUT
PIN
IOH
200
A
01186-002
Figure 2. Load Circuit for Timing Specifications