LTC2873H Просмотр технического описания (PDF) - Analog Devices
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LTC2873H Datasheet PDF : 32 Pages
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LTC2873
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, VCC = VL = 3.3V, unless otherwise noted.
RS485 Receiver Propagation
Delay vs Temperature
80
VCC = 3.3V, VL = 1.7V
VCC = 5V, VL = 1.7V
VCC = 3.3V, VL = 3.3V
70
VCC = 5V, VL = 5V
60
50
40
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
2873 G10
RS485 Receiver Skew
vs Temperature
2.0
1.5
1.0
0.5
0
–0.5
–1.0
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
2873 G11
RS485 Receiver Output Voltage
vs Load Current
6
VL = 5V
VL = 3.3V
5
VL = 1.7V
4
3
2
1
0
0
2
4
6
8
10
OUTPUT CURRENT (mA)
2873 G12
RS232 Receiver Input Threshold
vs Temperature
2.0
1.8
INPUT HIGH
1.6
1.4
INPUT LOW
1.2
1.0
–50 –25 0
VCC = 5V
VCC = 3.3V
25 50 75 100
TEMPERATURE (°C)
2873 G13
RS232 Receiver Output Voltage
vs Load Current
6
VL = 5V
VL = 3.3V
5
VL = 1.7V
4
3
2
1
0
0
2
4
6
8
10
OUTPUT CURRENT (mA)
2873 G14
RS485 Termination Resistance
vs Temperature
130
128
VCM = –7V
VCM = 2V
126
VCM = 12V
124
122
120
118
116
114
112
110
–50
–25 0 25 50
TEMPERATURE (°C)
75 100
2873 G15
RS232 Driver Switching at 250kbps
RS232 Operation at 1Mbps
FAST Mode (DE485/F232 High)
DI
3V/DIV
DI
3V/DIV
A
3V/DIV
FAST MODE SLOW MODE
2µs/DIV
2873 G16
A=B
3V/DIV
RO
3V/DIV
400ns/DIV
2873 G17
LTC2873 Drivers Changing Modes
DI
5V/DIV
A/DO
1V/DIV
50pF FROM A/DO to B/RI,
TERMINATION ENABLED
B/RI
1V/DIV
RO
5V/DIV
20ns/DIV
2873 G18
REV B
8
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