Datasheet

ADM3485E
Rev. D | Page 7 of 16
TEST CIRCUITS AND SWITCHING CHARACTERISTICS
V
OC
R
L
/2
R
L
/2
B
A
V
OD
03338-037
Figure 3. Driver Differential Output Voltage and
Common-Mode Output Voltage
R
L
375Ω
375Ω
V
OD
V
CM
=
–7V TO +12V
D
V
CC
03338-038
Figure 4. Driver Differential Output Voltage with
Varying Common-Mode Voltage
V
OH
I
OH
(–)
V
ID
R
0
I
OL
(+)
V
OL
03338-039
Figure 5. Receiver Output Voltage High and Output Voltage Low
IN
OUT
+1.5V +1.5V
+3V
0V
≈ +2V
≈ –2V
t
DD
t
DD
t
TD
t
TD
50%50%
10%10%
90%90%
D
GENERATOR
1
V
CC
50Ω
C
L
R
L
=
60Ω
C
L
= 15pF
2
OUT
1
PPR = 250kHz, 50% DUTY CYCLE, t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-040
Figure 6. Driver Differential Output Delay and Transition Times
3V
0V
V
OH
V
OL
V
OH
V
OL
V
OM
V
OM
V
OM
V
OM
IN
A
OUT
B
OUT
1.5V 1.5V
t
PLH
t
PHL
t
PHL
t
PLH
D
V
OM
R
L
= 27Ω
OUT
C
L
= 15pF
2
GENERATOR
1
V
CC
50Ω
S1
V
OM
=
V
OH
+ V
OL
2
≈ 1.5V
1
PPR = 250kHz, 50% DUTY CYCLE, t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
03338-041
Figure 7. Driver Propagation Delays
D
OUT
C
L
= 50pF
2
GENERATOR
1
50Ω
S1
V
OM
=
V
OH
+ V
OL
2
≈ 1.5V
R
L
= 110Ω
0V OR 3V
1
PPR = 250kHz, 50% DUTY CYCLE, t
R
≤ 6.0ns, Z
O
= 50Ω.
2
C
L
INCLUDES PROBE AND STRAY CAPACITANCE.
0V
V
OH
0V
3V
1.5V1.5V
0.25V
IN
OUT
V
OM
t
PZH
t
PHZ
03338-042
Figure 8. Driver Enable and Disable Times (t
PZH
, t
PSH
, t
PHZ
)