LTC2803 LINER [Linear Technology], LTC2803 Datasheet - Page 12

• Manufacturer Part Number: LTC2803
• Description: Multiprotocol Transceiver
• Manufacturer: LINER [Linear Technology]

TesT circuiTs
LTC2872
12
GND
OR
V
L
0V TO 3V
3V TO 0V
DY
V
CM
DRIVER
DXEN
A
B
±V
±V
RECEIVER
AB
AB
/2
/2
RXEN
Y
Z
Figure 7. RS485 Receiver Enable and Disable Timing Measurements (Note 5)
Figure 6. RS485 Receiver Propagation Delay Measurements (Note 5)
A
B
Figure 5. RS485 Driver Enable and Disable Timing Measurements
C
C
L
L
RA
R
R
RECEIVER
L
L
GND
GND
V
V
OR
OR
CC
CC
C
L
R
L
GND
RA
OR
V
L
C
L
RXEN
Y OR Z
Z OR Y
DXEN
RA
RA
A–B
RA
½V
½V
0V
10%
L
L
90%
t
t
t
t
t
t
ZHR485
ZHSD485
ZLR485
ZLSD485
ZLD485
ZHD485
½V
t
SKEWR485
,
,
L
t
PLHR485
t
RR485
½V
½V
½V
½V
L
L
= t
CC
CC
PLHR485
– t
½V
½V
PHLR485
L
L
½V
L
t
t
HZR485
t
t
LZR485
LZD485
HZD485
90%
10%
t
PHLR485
t
FR485
0.5V
0.5V
0.5V
0.5V
2872 F06
V
V
0V
–V
AB
CC
2872 F07
2872 F05
AB
V
0V
V
V
V
0V
V
0V
V
V
V
0V
L
L
OL
OH
L
CC
OL
OH
2872f