ADM3485E
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
A
R
L
/2
V
OD
R
L
/2
B
V
OC
03338-037
V
OM
R
L
= 27Ω
S1
D
GENERATOR
1
50Ω
V
CC
V
OH
+ V
OL
2
OUT
C
L
= 15pF
2
Figure 3. Driver Differential Output Voltage and
Common-Mode Output Voltage
375Ω
V
CM
=
–7V TO +12V
V
OD
R
L
03338-038
V
OM
=
≈ 1.5V
1
PPR = 250kHz, 50% DUTY CYCLE,
t
≤ 6.0ns, Z = 50Ω.
O
R
2
C INCLUDES PROBE AND STRAY CAPACITANCE.
L
D
V
CC
3V
IN
1.5V
1.5V
0V
375Ω
Figure 4. Driver Differential Output Voltage with
Varying Common-Mode Voltage
A
OUT
t
PLH
V
OM
t
PHL
V
OH
V
OM
V
OL
V
ID
0
R
t
PHL
03338-039
t
PLH
V
OH
V
OM
V
OL
03338-041
V
OL
I
OL
(+)
V
OH
I
OH
(–)
B
OUT
V
OM
Figure 5. Receiver Output Voltage High and Output Voltage Low
Figure 7. Driver Propagation Delays
C
L
D
GENERATOR
1
50Ω
V
CC
C
L
= 15pF
2
R
L
=
OUT
60Ω
S1
0V OR 3V
D
C
L
= 50pF
2
GENERATOR
1
OUT
R
L
= 110Ω
50Ω
V
OM
=
V
OH
+ V
OL
2
≈ 1.5V
1
PPR = 250kHz, 50% DUTY CYCLE,
t
≤ 6.0ns, Z = 50Ω.
R
O
2
C INCLUDES PROBE AND STRAY CAPACITANCE.
L
1
PPR = 250kHz, 50% DUTY CYCLE,
t
≤ 6.0ns, Z = 50Ω.
R
O
2
C INCLUDES PROBE AND STRAY CAPACITANCE.
L
+3V
IN
+1.5V
+1.5V
0V
3V
IN
1.5V
1.5V
0V
≈ +2V
03338-040
t
DD
50%
10%
90%
90%
t
DD
t
PZH
OUT
V
OM
t
PHZ
0.25V
V
OH
0V
03338-042
OUT
50%
10%
≈ –2V
t
TD
t
TD
Figure 6. Driver Differential Output Delay and Transition Times
Figure 8. Driver Enable and Disable Times (t
PZH
, t
PSH
, t
PHZ
)
Rev. D | Page 7 of 16
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