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ADM3491E Fiches technique(PDF) 9 Page - Analog Devices

No de pièce ADM3491E
Description  Full-Duplex, RS-485/RS-422 Transceivers
Download  20 Pages
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Fabricant  AD [Analog Devices]
Site Internet  http://www.analog.com
Logo AD - Analog Devices

ADM3491E Fiches technique(HTML) 9 Page - Analog Devices

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ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E
Rev. A | Page 9 of 20
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
VOC
RL/2
RL/2
Z
Y
VOD
Figure 7. Driver Differential Output Voltage and
Common-Mode Output Voltage
RL
375Ω
375Ω
VOD
VCM =
–7V TO +12V
D
VCC
Figure 8. Driver Differential Output Voltage with
Varying Common-Mode Voltage
VOH
IOH
(–)
VID
R
0
IOL
(+)
VOL
Figure 9. Receiver Output Voltage High and Output Voltage Low
IN
OUT
+1.5V
+1.5V
+3V
0V
≈ +2V
≈ –2V
tDD
tDD
tTD
tTD
50%
50%
10%
10%
90%
90%
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
3V
0V
VOH
VOL
VOH
VOL
VOM
VOM
VOM
VOM
IN
Y
OUT
Z
OUT
1.5V
1.5V
tPLH
tPHL
tPHL
tPLH
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.
0V
VOH
0V
3V
1.5V
1.5V
0.25V
IN
OUT
VOM
tPZH
tPHZ
Figure 12. Driver Enable and Disable Times (tPZH, tPSH, tPHZ)


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