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AD421 Fiches technique(PDF) 3 Page - Analog Devices

No de pièce AD421
Description  Loop-Powered 4 mA to 20 mA DAC
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
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AD421 Fiches technique(HTML) 3 Page - Analog Devices

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AD421
–3–
REV. C
TIMING CHARACTERISTICS1, 2, 3
Parameter
(B Versions)
Units
Conditions/Comments
tCK
100
ns min
Data Clock Period
tCL
50
ns min
Data Clock Low Time
tCH
50
ns min
Data Clock High Time
tDW
30
ns min
Data Stable Width
tDS
30
ns min
Data Setup Time
tDH
0
ns min
Data Hold Time
tLD
50
ns min
Latch Delay Time
tLL
50
ns min
Latch Low Time
tLH
50
ns min
Latch High Time
NOTES
1Guaranteed by characterization at initial product release, not production tested.
2See Figures 1 and 2.
3All input signals are specified with tr = tf = 5 ns (10% to 90% of V
CC ) and timed from a voltage level of (VIN + VIL )/2; tr and tf should not exceed 1
µs on any digital
input.
Specifications subject to change without notice.
WORD "N"
WORD "N +1"
10
1
1
1 1
11
1
1
00
0
0
0
0
1
0
0
1
CLOCK
DATA
LATCH
Figure 1. Serial Interface Waveforms (Normal Data Load)
CLOCK
DATA
LATCH
t
CK
t
CL
t
CH
t
DS
t
DH
t
DW
t
LD
t
LL
t
LH
Figure 2. Serial Interface Timing Diagram
(VCC = +3 V to +5 V, TA = TMIN to TMAX unless otherwise noted)


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