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ADM3493 Datasheet(PDF) 7 Page - Analog Devices

No. de pieza ADM3493
Descripción Electrónicos  3.3 V Slew Rate Limited, Half Duplex RS-485/RS-422 Transceiver
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

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ADM3493
Rev. 0 | Page 7 of 12
TEST CIRCUITS
RL/2
RL/2
VOC
A
B
VOD
Figure 3. Driver VOD and VOC
VCM =
–7V TO +12V
VCC
RL
375Ω
375Ω
VOD
D
Figure 4. Driver VOD with Varying Common-Mode Voltage
IOH
(–)
IOL
(+)
VOH
VOL
R
0
VID
Figure 5. Receiver VOH and VOL
D
GENERATOR1
VCC
50Ω
CL
RL =
60Ω
CL = 15pF2
OUT
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 6. Driver Differential Output Delay and Transition Times
D
VOM
RL =27Ω
OUT
CL = 15pF2
GENERATOR1
VCC
50Ω
S1
VOM =
VOH +VOL
2
≈ 1.5V
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 7. Driver Propagation Delays
D
OUT
CL = 50pF2
GENERATOR1
50Ω
S1
VOM =
VOH +VOL
2
≈ 1.5V
RL = 110Ω
0V OR 3V
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 8. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)
D
OUT
CL =50pF2
GENERATOR1
50Ω
S1
0V OR 3V
VCC
RL = 110Ω
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 9. Driver Enable and Disable Times (tPZL, tPSL, tPLZ)
GENERATOR1
50Ω
CL = 15pF2
R
1.5V
0
VOM =
VCC
2
OUT
VID
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 10. Receiver Propagation Delay
R
GENERATOR1
50Ω
CL2
S3
S1
S2
VCC
+1.5V
–1.5V
VID
1kΩ
1PPR = 250kHz, 50% DUTY CYCLE,
tR ≤ 6.0ns, ZO =50Ω.
2CL INCLUDES PROBE AND STRAY CAPACITANCE.
Figure 11. Receiver Enable and Disable Times


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