DC1786A - Schematic

5
4
3
2
1
E10
REVISION HISTORY
VCC
VCC
ECO
REV
DESCRIPTION
APPROVED
DATE
MITCHELL L.
03/30/11
J1
VCC
3V - 5.5V E16
RO
D2
GREEN
RO
VL
J4
C5
100nF
25V
R15
330
0603
LB
E12
GND
GND
330
0603
E36
U1
LTC2871IUHF
4
R12
R13
R14
RX485
5
10k
0603
10k
0603
10k
0603
DX485
6
E19
7
E20
8
DIN1
DIN2
C
E21
9
E22
GND
DX232
10
RX232
11
E23
12
VEE
VCC
GND
32
34
VL
RO
35
36
LB
H/F
A
CH2
B
RX485
VCC
DX485
Y
DI
GND
DIN1
Z
DIN2
DOUT1
DX232
DOUT2
RX232
VCC
VEE
VDD
FEN
GND
ROUT2
E25
31
E26
30
E27
29
E28
28
E29
26
Y
E30
24
E31
23
E32
22
VCC
C2
1uF
25V
39
19
18
17
16
15
14
13
C4
2.2uF
25V
E38
TP2
VDD
VDD
E37
CAP
LB JP1
EXT
GND
H/F JP2
VL
1
2
3
4
5
6
VL
LB
EXT
GND
VL
1
2
3
4
5
6
VL
H/F
EXT
GND
CH2 JP4
VL
1
2
3
4
5
6
VL
TE485
EXT
GND
1
2
3
4
5
6
RX485 JP5
VL
VL
CH2
EXT
GND
1
2
3
4
5
6
VL
RX485
EXT
GND
R4
R5
R6
100
100
100
100
100
100
H/F
E3
E4
TE485
CH2
DX485 JP6
VL
R3
LB
GND
2
Y
1
VL
R2
E2
B
Z
J5
TP6
R1
E1
A
4
GND
TE485 JP3
B
VEE
TP5
SW
SW
VL
VCC
5
3
VEE
VL
L1 10uH
TP7
VL
TP3
C3
1uF
25V
C
TP4
20
VDD
C1
220nF
25V
DOUT1
VCC
VEE
CAP
Z
DOUT2
21
GND
TP1
A
25
FEN
E35
RIN2
VCC
E24
GND
RIN1
B
27
VEE
CH2
RIN2
VEE
3
VL
ROUT1
SW
VL
RIN1
GND
RS232
RS485
VL
VEE
VEE
2
ROUT2
TE485
1
VEE
E18
GND
RS232
E17
ROUT1
37
E13
GND
33
GND
38
GND
CAP
J3
D
E34
TE485
R11
J2
GND
DI
E33
H/F
GND
RS232
D1
GREEN
RS232
VL
1.7V -VCC E11
VL
D
PRODUCTION
RS485
RS485
2
VCC
1
2
3
4
5
6
VL
DX485
EXT
GND
B
RX232 JP8
VL
1
2
3
4
5
6
VL
DX232
EXT
GND
1
2
3
4
5
6
FEN JP9
VL
VL
RX232
EXT
GND
R7
R8
R9
100
100
100
1
2
3
4
5
6
FEN
E15
E6
E7
E8
DX485
DX232
RX232
E5
RX485
DX232 JP7
VL
E9
GND
FEN
E14
GND
A
REPRESENTS PROBE PADS.
USED TO MANUFACTURE PCB
Y1
MH1
1
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL RESISTORS AND CAPACITOR ARE 1206.
1
Y2
MH2
1
1
MH3
1
MH4
1
CUSTOMER NOTICE
CONTRACT NO.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
APPROVALS
TOOLING HOLES REPRESENTS STAND OFFS
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
5
4
3
2
TECHNOLOGY
PCB DES. MI
ENG. MITCHELL L.
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
RS232/RS485 MULTIPROTOCOL TRANSCEIVER
WITH INTEGRATED TERMINATION
SIZE
B
DATE:
IC NO.
REV
LTC2871IUHF
DEMO CIRCUIT 1786A
Wednesday, March 30, 2011
2
SHEET
1
1
OF
1
A
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