LTC2873H Просмотр технического описания (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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TEST CIRCUITS
L1
10µH
C1
220nF
VCC
C4
2.2µF
VCC
SW CAP
STEP
VL
VDD
DI LTC2873
RO
C2
1µF
+–
SHDN
VEE
C3
V
485/232
1µF
DE485/F232
RE485
A/DO
TE485
B/RI
LB GND
SHDN
VDD
VEE
½VL
+6.3V
–5.9V
tVEE
tVDD
tRDY = MAX (tVDD, tVEE)
Figure 13. Timing Coming Out of Shutdown Mode
LTC2873
0V
0V
2873 F13
VCC
C4
2.2µF
STEP
+–
V
L1
10µH
C1
220nF
VCC
SW CAP
VL
VDD
DI LTC2873
RO
SHDN
VEE
485/232
DE485/F232
RE485
A/DO
TE485
B/RI
LB GND
485/232
A
C4
1µF
B
C3
1µF
RO
CB
CA
50pF
RA
3k
50pF
½VL
½VL
tDR485
Figure 14. Mode Change Timing
½VL
3V
tR232
0V
½VL
tR232
2873 F14
VCC
C4
L1
10µH
C1
220nF
2.2µF
VCC
SW CAP
VL
VDD
DI LTC2873
C2
1µF
RO
SHDN
VEE
C3
485/232
1µF
DE485/F232
RE485
A/DO
TE485
B/RI
LB GND
(a)
VCC
C4
2.2µF
HIGH FOR FAST MODE
LOW FOR SLOW MODE
L1
10µH
C1
220nF
VCC
SW CAP
VL
VDD
DI LTC2873
RO
SHDN
VEE
485/232
DE485/F232
RE485
A/DO
TE485
B/RI
LB GND
(b)
C2
1µF
C3
1µF
2873 F15
Figure 15. Testing Max Data Rate for (a) RS485 and (b) RS232. Observe that Data In Matches Data Out
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REV B
15
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