adm3485 Analog Devices, Inc., adm3485 Datasheet - Page 9

• Manufacturer Part Number: adm3485
• Description: 3.3 V Slew Rate Limited, Half- And Full-duplex, Rs-485/rs-422 Transceivers
• Manufacturer: Analog Devices, Inc.

TEST CIRCUITS
V
V
ID
CC
0
Figure 8. Differential Output Voltage Drivers
Figure 9. CMOS Output Voltage High and
R
with Varying Common-Mode Voltage
Figure 7. Differential Output Voltage
CMOS Output Voltage Low Receivers
and Common-Mode Voltage Drivers
D
A/Y
B/Z
V
V
OD
OD
V
OL
R
R
R
L
L
L
/2
/2
375Ω
375Ω
I
(+)
OL
V
OC
V
OH
V
–7V TO +12V
CM
=
I
(–)
OH
ADM3483/ADM3485/ADM3488/ADM3490/ADM3491
Rev. B | Page 9 of 20
Figure 10. Driver Differential Output Delay and Transition Times
1
2
PPR = 250kHz, 50% DUTY CYCLE,
C
GENERATOR
1
2
L
Figure 12. Driver Enable and Disable Times (t
1
2
GENERATOR
PPR = 250kHz, 50% DUTY CYCLE,
C
PPR = 250kHz, 50% DUTY CYCLE,
C
GENERATOR
INCLUDES PROBE AND STRAY CAPACITANCE.
L
L
INCLUDES PROBE AND STRAY CAPACITANCE.
INCLUDES PROBE AND STRAY CAPACITANCE.
0V OR 3V
Figure 11. Driver Propagation Delays
1
1
1
50Ω
50Ω
50Ω
D
V
V
CC
CC
D
V
D
OM
t
V
=
S1
R
C
OM
t
V
L
≤ 6.0ns, Z
t
R
OH
R
C
= 50pF
S1
≤ 6.0ns, Z
=
L
≤ 6.0ns, Z
+ V
2
V
OH
OL
C
2
+ V
2
L
O
≈ 1.5V
= 15pF
= 50Ω.
O
OL
C
V
O
R
60Ω
L
PZH
= 50Ω.
OM
= 50Ω.
L
≈ 1.5V
= 15pF
R
=
, t
L
2
R
PSH
OUT
= 27Ω
L
OUT
, t
2
= 110Ω
OUT
PHZ
)