adm2485 Analog Devices, Inc., adm2485 Datasheet - Page 9

• Manufacturer Part Number: adm2485
• Description: High Speed Isolated Rs-485 Transceiver With Integrated Transformer Driver
• Manufacturer: Analog Devices, Inc.

TEST CIRCUITS
V
GND
CM (HF)
2.2kΩ
2
RTS
RxD
TxD
RE
Figure 6. High Frequency, Common-Mode Noise Test Circuit
RTS
RxD
TxD
RE
V
DD1
Figure 5. Supply-Current Measurement Test Circuit
V
DD1
100nF
Figure 3. Driver Voltage Measurement
Figure 4. Driver Voltage Measurement
GND
GND
1
1
V
V
DD2
OD3
V
100nF
OD
60Ω
V
GND
DD2
375Ω
375Ω
DE OUT
A
B
2
GND
V
R
R
DD2
GND
110Ω
195Ω
195Ω
2
V
TEST
2
V
DE OUT
A
B
OC
150Ω
470nF
GND
V
DD2
50Ω
50Ω
195Ω
110Ω
195Ω
V
2
TEST2
22kΩ
110nF
F
TEST
V
HF
Rev. 0 | Page 9 of 20
,
RTS
RxD
TxD
RE
RTS
TxD
+1.5V
–1.5V
V
DD1
RE IN
Figure 8. RTS to DE OUT Propagation Delay
Figure 10. Receiver Propagation Delay
S1
Figure 7. Driver Propagation Delay
GND
Figure 11. Receiver Enable/Disable
Figure 9. Driver Enable/Disable
A
B
1
A
B
B
A
RE
RE
S1
R
LDIFF
V
C
DD2
50pF
L
C
GND
L
V
OUT
R
C
C
L
V
110Ω
L1
L2
V
2
OUT
OUT
DE OUT
A
B
150Ω
V
CC
ADM2485
V
S2
CC
S2
50pF