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LTC2802 Scheda tecnica(PDF) 8 Page - Analog Devices

Il numero della parte LTC2802
Spiegazioni elettronici  Single-Bus RS485/RS232 Multiprotocol Transceiver with Switchable Termination
PDF  32 Pages
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

LTC2802 Scheda tecnica(HTML) 8 Page - Analog Devices

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LTC2873
8
REV B
For more information www.analog.com
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VCC = VL = 3.3V, unless otherwise noted.
RS232 Receiver Input Threshold
vs Temperature
RS232 Receiver Output Voltage
vs Load Current
RS485 Termination Resistance
vs Temperature
RS232 Driver Switching at 250kbps
RS232 Operation at 1Mbps
FAST Mode (DE485/F232 High)
LTC2873 Drivers Changing Modes
TEMPERATURE (°C)
–50
2.0
1.8
1.6
1.4
1.2
1.0
50
75
–25
2873 G13
100
25
0
VCC = 5V
VCC = 3.3V
INPUT HIGH
INPUT LOW
OUTPUT CURRENT (mA)
0
6
5
4
2
3
1
0
8
2
2873 G14
10
6
4
VL = 5V
VL = 3.3V
VL = 1.7V
TEMPERATURE (°C)
–50
130
118
116
114
112
110
128
126
124
122
120
50
75
–25
2873 G15
100
25
0
VCM = –7V
VCM = 2V
VCM = 12V
FAST MODE
SLOW MODE
2µs/DIV
DI
3V/DIV
A
3V/DIV
2873 G16
400ns/DIV
RO
3V/DIV
DI
3V/DIV
A = B
3V/DIV
2873 G17
TERMINATION ENABLED
50pF FROM A/DO to B/RI,
20ns/DIV
DI
5V/DIV
RO
5V/DIV
A/DO
1V/DIV
B/RI
1V/DIV
2873 G18
RS485 Receiver Propagation
Delay vs Temperature
RS485 Receiver Skew
vs Temperature
RS485 Receiver Output Voltage
vs Load Current
TEMPERATURE (°C)
–50
80
70
60
50
40
50
75
–25
2873 G10
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
–25
0
25
50
75
100
–1.0
–0.5
0
0.5
1.0
1.5
2.0
2873 G11
OUTPUT CURRENT (mA)
0
6
5
4
2
3
1
0
8
2
2873 G12
10
6
4
VL = 5V
VL = 3.3V
VL = 1.7V



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