ADM1487 AD [Analog Devices], ADM1487 Datasheet - Page 5

• Manufacturer Part Number: ADM1487
• Description: Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and +/-10kV ESD Protection
• Manufacturer: AD [Analog Devices]

ADM1487 TEST CIRCUITS AND TIMING
Rev. PrC
V
DIFF
DI
DI
0V
3V
-V
0V
B
A
V
Figure 2. Driver/Receiver Timing Test Circuit
0
0
DE
D
3V
Figure 4. Receiver Propagation Delays
Figure 1. Driver DC Load Test Circuit
V
1.5V
Figure 3. Driver Propagation Delays
0
10%
A
V
B
0
/2
V
A
A
OD2
90%
t
DPLH
t
V
DR
OD
R
DIFF
PRELIMINARY TECHNICAL DATA
t
V
SKEW
DIFF
#
R
R
= V
= |t
#
C
C
A
DPLH
L2
L1
- V
-t
B
DPHL
#
V
#
|
OC
t
A
B
DPHL
t
DF
90%
R
15pF
10%
RO
–5–
A, B
A, B
Figure 7. Test Load for Receiver Enable/Disable Time Test
DE
Figure 5. Test Load for Driver Enable/Disable Time Test
V
V
3V
V
5V
5V
OH
5V
Figure 8. Receiver Enable and Disable Delay Times
0V
OL
OL
Figure 6. Driver Enable and Disable Times
OUTPUT
UNDER
TEST
2.3V
RO
1.5
2.3
1.5
V
V
V
t
DZL(SHDN)
t
DZH(SHDN)
, t
,
t
DZL
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
DZH
15pF
15pF
C
C
RL
RL
#
#
POINT
POINT
TEST
TEST
#
500V
#
V
CC
1kV
1kV
V
S2
S1
ADM1487
CC
t
t
DHZ
DLZ
S2
S1
V
V
1.5V
OH
1.5
OL
V
+ 0.5V
- 0.5V
0.5V
0.5V