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LTC2802 Datasheet(PDF) 15 Page - Analog Devices

Part # LTC2802
Description  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
PDF  32 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC2802 Datasheet(HTML) 15 Page - Analog Devices

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LTC2873
15
REV B
For more information www.analog.com
TEST CIRCUITS
SW
VCC
C1
220nF
L1
10µH
LTC2873
VL
DI
RO
C4
2.2µF
2873 F13
SHDN
485/232
DE485/F232
RE485
TE485
LB
VDD
VEE
VCC
CAP
B/RI
A/DO
GND
C2
1µF
C3
1µF
+–
V
tVEE
tVDD
SHDN
VDD
VEE
+6.3V
–5.9V
0V
½VL
0V
tRDY = MAX (tVDD, tVEE)
STEP
SW
VCC
C1
220nF
L1
10µH
LTC2873
VL
DI
RO
C4
2.2µF
2873 F14
SHDN
485/232
DE485/F232
RE485
TE485
LB
VDD
VEE
VCC
CAP
B/RI
A/DO
GND
C4
1µF
C3
1µF
CB
50pF
CA
50pF
RA
3k
+–
V
tDR485
3V
0V
½VL
½VL
STEP
tR232
tR232
½VL
½VL
RO
B
A
485/232
SW
VCC
C1
220nF
L1
10µH
LTC2873
VL
DI
RO
C4
2.2µF
2873 F15
SHDN
485/232
DE485/F232
RE485
TE485
LB
VDD
VEE
VCC
CAP
B/RI
A/DO
GND
C2
1µF
C3
1µF
SW
VCC
C1
220nF
L1
10µH
LTC2873
VL
DI
RO
C4
2.2µF
SHDN
485/232
DE485/F232
RE485
TE485
LB
VDD
VEE
VCC
CAP
B/RI
A/DO
GND
C2
1µF
C3
1µF
(a)
(b)
HIGH FOR FAST MODE
LOW FOR SLOW MODE
Figure 13. Timing Coming Out of Shutdown Mode
Figure 14. Mode Change Timing
Figure 15. Testing Max Data Rate for (a) RS485 and (b) RS232. Observe that Data In Matches Data Out



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