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ADM3072E Datasheet(PDF) 10 Page - Analog Devices

Part No. ADM3072E
Description  3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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ADM3072E Datasheet(HTML) 10 Page - Analog Devices

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ADM3070E/ADM3071E/ADM3072E/ADM3073E/ADM3074E/ADM3075E/ADM3076E/ADM3077E/ADM3078E
Rev. A | Page 10 of 20
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
VOC
RL/2
RL/2
Z
Y
VOD
Figure 7. Driver DC Test Load
DI
DE
Y
Z
3V
CL
RL
VOD
Figure 8. Driver Timing Test Circuit
VCC
tDPLH
tDR
tDF
tDPHL
0V
VCC/2
1/2VO
1/2VO
DI
Z
Y
VO
+VO
–VO
VDIFF
10%
90%
90%
10%
VDIFF = V (Y) – V (Z)
tDSKEW = |tDPLH tDPHL|
0V
Figure 9. Driver Propagation Delays
OUT
S1
0V OR 3V
GENERATOR
RL
500Ω
50Ω
DE
OUT
CL
50pF
+
tDZH, tDZH(SHDN)
VOM = (0 + VOH)/2
tDHZ
VCC/2
0.25V
VCC
0V
VOH
0V
D
Figure 10. Driver Enable and Disable Times (tDHZ, tDZH, tDZH(SHDN))
OUT
S1
VCC
0V OR 3V
GENERATOR
RL
500Ω
50Ω
DE
OUT
CL
50pF
+
tDZL, tDZL(SHDN)
VOM = (VOL + VCC)/2
tDLZ
VCC/2
0.25V
VCC
VCC
0V
VOL
D
Figure 11. Driver Enable and Disable Times (tDZL, tDLZ, tDZL(SHDN))
VID
ATE
B
R
RECEIVER
OUTPUT
A
Figure 12. Receiver Propagation Delay Test Circuit
NOTES
1. THE RISE TIME AND FALL TIME OF INPUT A AND INPUT B < 4ns.
A
B
RO
VOL
VOH
1.5V
+1V
–1V
tRPHL
tRPLH
Figure 13. Receiver Propagation Delays


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