Datasheet

ADM485
REV. A
–4–
Test Circuits
R
R
V
OC
V
OD
Figure 1. Driver Voltage Measurement Test Circuit
375Ω
V
OD3
V
TST
375Ω
60Ω
Figure 2. Driver Voltage Measurement Test Circuit 2
A
B
R
LDIFF
C
L1
C
L2
Figure 3. Driver Propagation Delay Test Circuit
V
OUT
C
L
A
B
V
CC
S2
R
L
S1
0V OR 3V
DE IN
DE
Figure 4. Driver Enable/Disable Test Circuit
C
L
V
OUT
RE
A
B
Figure 5. Receiver Propagation Delay Test Circuit
V
OUT
V
CC
S2
R
L
S1
RE IN
RE
C
L
+1.5V
–1.5V
Figure 6. Receiver Enable/Disable Test Circuit
T
PLH
T
PHL
0V
0V
1.5V
1.5V
A–B
RO
V
OL
V
OH
Figure 9. Receiver Propagation Delay
T
ZH
1.5V
1.5V
3V
0V
1.5V
T
HZ
V
OH
V
OH
– 0.5V
0V
R
V
OL
+ 0.5V
T
ZL
1.5V
T
LZ
V
OL
R
RE
O/P LOW
O/P HIGH
Figure 10. Receiver Enable/Disable Timing
Switching Characteristics
–VO
VO
1/2VO
0V
3V
1.5V
1.5V
T
PLH
T
SKEW
VO
0V
90% POINT
10% POINT
90% POINT
10% POINT
T
PHL
B
A
T
SKEW
T
R
T
F
Figure 7. Driver Propagation Delay, Rise/Fall Timing
T
ZH
1.5V
DE
1.5V
3V
0V
2.3V
T
HZ
V
OH
V
OH
– 0.5V
0V
A, B
V
OL
+ 0.5V
T
ZL
2.3V
T
LZ
V
OL
A, B
Figure 8. Driver Enable/Disable Timing