LTC2873H Ver la hoja de datos (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.
VCC Supply Current vs Supply
Voltage in Shutdown Mode
15
14
13
12
11
10
9
8
7
6
5
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
2873 G01
VCC Supply Current vs RS232
Data Rate in Slow Mode
20
DRIVER AND
RECEIVER ENABLED
A/DO TIED TO B/RI
16 VARIOUS LOADS
VCC = 5V
VCC = 3.3V
2.5nF
1nF
12
1nF
8
2.5nF
75pF
75pF
4
0
50 100 150 200 250
DATA RATE (kbps)
2873 G04
RS485 Driver Propagation Delay
vs Temperature
50
VCC = 3.3V, VL = 1.7V
VCC = 5V, VL = 1.7V
40
VCC = 3.3V, VL = 3.3V
VCC = 5V, VL = 5V
30
20
10
0
–50 –25 0
25 50 75 100
TEMPERATURE (°C)
2873 G07
VCC Supply Current vs Supply
Voltage in RDY Mode
5
DRIVER, RECEIVER AND TERMINATOR
DISABLED
4
85°C
3
25°C
–40°C
2
1
3
3.5
4
4.5
5
5.5
SUPPLY VOLTAGE (V)
2873 G02
VCC Supply Current vs RS232
Data Rate in Fast Mode
24
DRIVER AND
RECEIVER ENABLED
20
A/DO TIED TO B/RI
VARIOUS LOADS
2.5nF 1nF
16
VCC = 5V
VCC = 3.3V
250pF
12
1nF
8
75pF
250pF
75pF
2.5nF
4
0
200 400 600 800 1000
DATA RATE (kbps)
2873 G05
RS485 Driver 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 G08
VCC Supply Current
vs RS485 Data Rate
100
RS485 DRIVER
AND RECEIVER
80
SWITCHING.
CL = 100pF ON EACH
DRIVER OUTPUT.
60
TE485 LOW
40
VCC = 5V
VCC = 3.3V
20
TE485 HIGH
0
0.1
1
10
DATA RATE (Mbps)
100
2873 G03
RS485 Driver Differential Output
Voltage vs Temperature
4.5
4.0
RL = 100Ω
3.5
RL = 54Ω
3.0
2.5
RL = 100Ω
2.0
RL = 54Ω
1.5
1.0
0.5
0
–50 –25 0
VCC = 5V
VCC = 3.3V
25 50 75 100
TEMPERATURE (°C)
2873 G06
RS485 Driver Short-Circuit
Current vs Short-Circuit Voltage
150
VCC = 5V
VCC = 3.3V
100
50
OUTPUT LOW
0
–50
–100
OUTPUT HIGH
–150
–15
–10 –5 0
5 10 15
SHORT–CIRCUIT VOLTAGE (V)
2873 G09
REV B
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