AD421BN datasheet(3/14 Pages) AD

Part #	AD421BN

Description	Loop-Powered 4 mA to 20 mA DAC

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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

11

1

00

0

1

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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