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