V
參數(shù)資料
型號： DC1786A
廠商： Linear Technology
文件頁數(shù)： 36/36頁
文件大?。?/td> 0K
描述： BOARD DEMO LTC2871
設(shè)計(jì)資源： DC1786A Design Files
DC1786A Schematic
標(biāo)準(zhǔn)包裝： 1
主要目的： 接口，收發(fā)器，RS-232/RS-485
嵌入式： 否
已用 IC / 零件： LTC2871
主要屬性： 3 個(gè)驅(qū)動器，3 個(gè)接收器
次要屬性： 3 V ~ 5.5 V 電源
已供物品： 板
相關(guān)產(chǎn)品： LTC2871CUHF#PBF-ND - IC TXRX RS485/RS422 38-QFN
LTC2871IUHF#PBF-ND - IC TXRX RS485/RS422 38-QFN
LTC2871CFE#PBF-ND - IC TXRX RS485/RS422 38-TSSOP
LTC2871IFE#PBF-ND - IC TXRX RS485/RS422 38-TSSOP
LTC2871CUHF#TRPBF-ND - IC TXRX RS485/RS422 38-QFN
LTC2871IFE#TRPBF-ND - IC TXRX RS485/RS422 38-TSSOP
LTC2871IUHF#TRPBF-ND - IC TXRX RS485/RS422 38-QFN
LTC2871CFE#TRPBF-ND - IC TXRX RS485/RS422 38-TSSOP
LTC2870/LTC2871
9
28701f
PIN FUNCTIONS
PIN NAME
LTC2870
QFN
LTC2870
TSSOP
LTC2871
QFN
LTC2871
TSSOP
DESCRIPTION
VCC
16, 20, 24
19, 23, 27
21, 27, 33
25, 31, 37 Input Supply (3V to 5.5V). Tie all three pins together and connect a 2.2μF or larger
capacitor between VCC (adjacent to VDD) and GND.
VL
25
28
35
1
Logic Supply (1.7V to 5.5V) for the receiver outputs, driver inputs, and control inputs.
Bypass this pin to GND with a 0.1μF capacitor if not tied tot VCC. Keep VL ≤ VCC for
proper operation. However, VL > VCC will not damage the device, provided that absolute
maximum limits are respected.
VDD
15
18
20
24
Generated Positive Supply Voltage for RS232 Driver (+7V). Connect 1μF capacitor
between VDD and GND.
VEE
1, 12, 29
4, 15, 29
1, 12, 16,
19, 39
5, 16, 20,
23, 39
Generated Negative Supply Voltage for RS232 Driver (–6.3V). Tie all pins together and
connect 1μF capacitor between VEE (adjacent to the CAP pin) and GND.
GND
10, 13,
18, 23
13, 16,
21, 26
14, 17,
25, 32
18, 21,
29, 36
Ground. Tie all four pins together.
CAP
11
14
15
19
Charge Pump Capacitor for Generated Negative Supply Voltage. Connect a 220nF
capacitor between CAP and SW.
SW
14
17
18
22
Switch Pin. Connect 10μH inductor between SW and VCC.
A
22
25
29
33
RS485 Positive Receiver Input (Full-Duplex Mode) or RS232 Receiver Input 1 (LTC2870).
B
21
24
28
32
RS485 Negative Receiver Input (Full-Duplex Mode) or RS232 Receiver Input 2 (LTC2870).
RA
2
5
RS485 Differential Receiver Output or RS232 Receiver Output 1.
RB
3
6
RS232 Receiver Output 2.
RO
34
38
RS485 Differential Receiver Output.
RIN1
31
35
RS232 Receiver Input 1.
RIN2
30
34
RS232 Receiver Input 2.
ROUT1
2
6
RS232 Receiver Output 1.
ROUT2
3
7
RS232 Receiver Output 2.
DIN1
8
12
RS232 Driver Input 1.
DIN2
9
13
RS232 Driver Input 2.
TYPICAL PERFORMANCE CHARACTERISTICS
RS232 Driver Outputs Enabling
and Disabling
VDD and VEE Powering Up
VDD and VEE Ripple
5V/DIV
2V/DIV
28701 G20
40μs/DIV
FEN
VDD
VEE
5V/DIV
28701 G19
40μs/DIV
TOP CURVES: FAST ENABLE
DX232
BOTTOM CURVES: SHUTDOWN
DX232
FEN = 1
FEN = 0
DOUT1
DOUT2
DOUT1
DX232
DOUT2
10mV/DIV
28701 G21
40μs/DIV
FAST ENABLE MODE,
ALL DRIVERS AND RECEIVERS DISABLED.
VDD RIPPLE
VEE RIPPLE
TA = 25°C, VCC = VL = 3.3V, unless otherwise noted.
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