LTC1482_15 Datasheet, PDF (5/16 Pages) Linear Technology – Low Power RS485 Transceiver with Carrier Detect and Receiver Fail-Safe

LTC1482
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Input Offset Voltage vs
Temperature
0
–20 ^{VCC = 5V}
–40
–60
–80
–100
V_CM = 12V
–120
–140
–160
V_CM = 0V
V_CM = –7V
–180
–200
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G04
Receiver Hysteresis vs
Temperature
100
90 ^{VCC = 5V}
80
70
60
50
V_CM = –7V TO 12V
40
30
20
10
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G05
Carrier Detect Output Voltage vs
Receiver Input Voltage
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–0.25
–0.15 –0.05 0.05 0.15 0.25
RECEIVER INPUT VOLTAGE (V)
1482 G07
Carrier Detect Threshold Voltage
(Output High) vs Temperature
0.25
0.20
0.15
0.10
0.05
0
–0.05
POSITIVE
V_THCD(HIGH)
NEGATIVE ^{VCM = 0V}
V_THCD(HIGH)
V_CM = 12V
V_CM = –7V
V_CM = 12V
–0.10
–0.15
V_CM = 0V ^VCM ^{= –7V}
–0.20 VCC = 5V
–0.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G08
Receiver Output High Voltage vs
Temperature
4.5
4.4
V_CC = 4.75V
I_OUT = –8mA
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G10
Carrier Detect Output High
Voltage vs Output Current
5.0
4.5
V_CC = 4.75V
T_A = 25°C
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–35 –30 –25 –20 –15 –10
OUTPUT CURRENT (µA)
–5 0
1482 G11
Receiver Input Threshold Voltage
vs Supply Voltage
0
–0.02
T_A = 25°C
–0.04
–0.06
–0.08
V_THRO(HIGH)
–0.10
–0.12
V_THRO(LOW)
–0.14
–0.16
–0.18
–0.20
4.5
4.75
5
5.25
SUPPLY VOLTAGE (V)
5.5
1482 G06
Carrier Detect Threshold Voltage
(Output Low) vs Temperature
0.25
0.20 ^POSITIVE
V_THCD(LOW)
V_CM = 12V
0.15
V_CM = –7V
0.10
V_CM = 0V
0.05
0
–0.05
–0.10
–0.15
–0.20
NEGATIVE
V_THCD(LOW)
V_CC = 5V
V_CM = 12V
V_CM = 0V _{VCM = –7V}
–0.25
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1482 G09
Receiver and Carrier Detect
Output Low Voltage vs Output
Current
40
35
T_A = 25°C
V_CC = 4.75
30
25
20
15
10
5
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2
OUTPUT LOW VOLTAGE (V)
1482 G12
5