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ADM1485ARMZ Datasheet(PDF) 4 Page - Analog Devices

Part No. ADM1485ARMZ
Description  5 V Low Power EIA RS-485 Transceiver
Download  11 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADM1485ARMZ Datasheet(HTML) 4 Page - Analog Devices

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REV.
–4–
ADM1485
Test Circuits
VOD
R
R
VOC
Test Circuit 1. Driver Voltage Measurement
VOD3
60
375
375
VTST
Test Circuit 2. Driver Voltage Measurement
RLDIFF
A
B
CL1
CL2
Test Circuit 3. Driver Propagation Delay
DE
0V OR 3V
DE IN
A
B
S1
CL
VOUT
RL
S2
VCC
Test Circuit 4. Driver Enable/Disable
RE
A
B
CL
VOUT
Test Circuit 5. Receiver Propagation Delay
RE
+1.5V
RE IN
S1
CL
VOUT
RL
S2
VCC
–1.5V
Test Circuit 6. Receiver Enable/Disable
Switching Characteristics
3V
0V
B
A
0V
–VO
VO
90% POINT
10% POINT
tR
tSKEW = tPLH tPHL
1/2VO
tPLH
1.5V
1.5V
tPHL
90% POINT
10% POINT
tF
VO
Figure 1. Driver Propagation Delay, Rise/Fall Timing
DE
A, B
A, B
1.5V
2.3V
2.3V
tZH
tZL
1.5V
3V
0V
VOL
VOH
0V
VOL + 0.5V
VOH – 0.5V
tHZ
tLZ
Figure 2. Driver Enable/Disable Timing
A, B
RO
0V
tPLH
1.5V
0V
tPHL
1.5V
VOH
VOL
tSKEW = tPLH tPHL
Figure 3. Receiver Propagation Delay
RE
R
R
1.5V
1.5V
1.5V
tZH
tZL
1.5V
3V
0V
VOL
VOH
VOL + 0.5V
VOH – 0.5V
tHZ
tLZ
O/P LOW
O/P HIGH
0V
Figure 4. Receiver Enable/Disable Timing


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