Datasheet

ADM2485
Rev. A | Page 13 of 20
TEST CIRCUITS
V
OC
R
R
V
OD
06021-003
Figure 21. Driver Voltage Measurement
60Ω
V
OD3
375
Ω
375Ω
V
TEST
06021-004
Figure 22. Driver Voltage Measurement
V
DD1
DE OUT
150Ω
GND
1
A
B
V
DD2
GND
2
GALVANIC ISOLATION
V
DD2
195Ω
110Ω
195Ω
GND
2
RTS
TxD
RxD
RE
06021-005
Figure 23. Supply-Current Measurement Test Circuit
06021-006
V
DD1
DE OUT
GND
1
B
A
GALVANIC ISOLATION
50Ω
110nF
50Ω
V
TEST2
RTS
TxD
RxD
GND
2
2.2kΩ
V
DD2
GND
2
100nF
100nF
V
CM (HF)
470nF
22kΩ
F
TEST
,
V
HF
RE
195Ω
110Ω
195Ω
V
DD2
GND
2
Figure 24. High Frequency, Common-Mode Noise Test Circuit
C
L1
R
LDIFF
A
B
C
L2
0
6021-007
Figure 25. Driver Propagation Delay
V
DD1
DE OUT
GND
1
A
B
V
DD2
GND
2
GALVANIC ISOLATION
RTS
TxD
RxD
RE
150Ω
50pF
06021-008
Figure 26. RTS to DE OUT Propagation Delay
V
CC
S2
V
OUT
110Ω
50pF
S1
B
A
TxD
RTS
0
6021-009
Figure 27. Driver Enable/Disable
C
L
V
OUT
RE
A
B
06021-010
Figure 28. Receiver Propagation Delay
V
CC
S2
V
OUT
R
L
C
L
+1.5
V
–1.5V
S1
RE
RE IN
06021-011
Figure 29. Receiver Enable/Disable