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ADM3491 Datasheet(PDF) 9 Page - Analog Devices

No. de pieza ADM3491
Descripción Electrónicos  3.3 V Slew Rate Limited, Half- and Full-Duplex, RS-485/RS-422 Transceivers
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Fabricante Electrónico  AD [Analog Devices]
Página de inicio  http://www.analog.com
Logo AD - Analog Devices

ADM3491 Datasheet(HTML) 9 Page - Analog Devices

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ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Rev. B | Page 9 of 20
TEST CIRCUITS
RL/2
RL/2
VOC
A/Y
B/Z
VOD
Figure 7. Differential Output Voltage
and Common-Mode Voltage Drivers
VCM =
–7V TO +12V
VCC
RL
375Ω
375Ω
VOD
D
Figure 8. Differential Output Voltage Drivers
with Varying Common-Mode Voltage
IOH
(–)
IOL
(+)
VOH
VOL
R
0
VID
Figure 9. CMOS Output Voltage High and
CMOS Output Voltage Low Receivers
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 10. 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 11. 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 12. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)


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