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參數(shù)資料
型號(hào)： DC1786A
廠商： Linear Technology
文件頁數(shù)： 34/36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(dòng)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
7
28701f
TYPICAL PERFORMANCE CHARACTERISTICS
VCC Supply Current
vs RS232 Data Rate
VCC Supply Current vs Supply
Voltage, All Transceivers at Max
Rate (LTC2871)
RS485 Driver Differential Output
Voltage vs Temperature
RS485 Driver Propagation Delay
vs Temperature
RS485 Driver Skew
vs Temperature
RS485 Driver Short-Circuit
Current vs Short-Circuit Voltage
VCC Supply Current vs Supply
Voltage in Shutdown Mode
VCC Supply Current vs Supply
Voltage in Fast Enable Mode
VCC Supply Current
vs RS485 Data Rate
INPUT VOLTAGE (V)
3
INPUT
CURRENET
(μA)
30
25
20
15
10
5
0
4.5
5
3.5
28701 G01
5.5
4
H/F LOW
H/F HIGH
SUPPLY VOLTAGE (V)
3
SUPPL
Y
CURRENT
(mA)
5
4
3
2
1
4.5
5
3.5
28701 G02
5.5
4
–40°C
25°C
85°C
ALL DRIVERS AND RECEIVERS DISABLED
TE485 LOW
DATA RATE (Mbps)
0.1
SUPPL
Y
CURRENT
(mA)
100
80
60
40
20
0
10
28701 G03
100
1
TE HIGH
TE LOW
VCC = 5V
VCC = 3.3V
ALL RS485 DRIVERS
AND RECEIVERS
SWITCHING.
CL = 100pF ON EACH
DRIVER OUTPUT.
DATA RATE (kbps)
0
INPUT
CURRENT
(mA)
35
30
25
15
20
10
5
400
28701 G04
500
300
200
100
0.05nF
0.5nF
2.5nF
VCC = 5V
VCC = 3.3V
ALL RS232 DRIVERS
AND RECEIVERS
SWITCHING.
SUPPLY VOLTAGE (V)
3
SUPPL
Y
CURRENT
(mA)
120
110
100
90
80
70
4.5
5
3.5
28701 G05
5.5
4
85°C
ALL DRIVERS AND
RECEIVERS SWITCHING.
DRIVER OUTPUTS TIED TO
RECEIVER INPUTS.
RS232: 0.5Mbps (CL = 500pF)
RS485: 20Mbps (CL = 100pF)
TE485 HIGH
25°C
–40°C
TEMPERATURE (°C)
–50
VOL
TAGE
(V)
4.5
3.5
2.5
1.5
4.0
3.0
2.0
1.0
0.5
0
50
75
–25
28701 G06
100
25
0
RL = 100Ω
RL = 54Ω
RL = 100Ω
RL = 54Ω
VCC = 5V
VCC = 3.3V
TEMPERATURE (°C)
–50
DELA
Y
(ns)
50
40
20
10
0
50
75
–25
28701 G06
100
25
0
VCC = 3.3V, VL = 1.7V
VCC = 5V, VL = 1.7V
VCC = 3.3V, VL = 3.3V
VCC = 5V, VL = 5V
TEMPERATURE (°C)
–50
SKEW
(ns)
3.0
2.5
1.5
2.0
1.0
0.5
0
50
75
–25
28701 G08
100
25
0
SHORT-CIRCUIT VOLTAGE (V)
–10
SHOR
T-CIRCUIT
CURRENT
(mA)
150
100
0
50
–50
–100
–150
10
–5
28701 G09
15
5
0
OUTPUT LOW
OUTPUT HIGH
VCC = 5V
VCC = 3.3V
TA = 25°C, VCC = VL = 3.3V, unless otherwise noted.
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