7
LT1251/LT1256
TYPICAL PERFORMANCE CHARACTERISTICS
UW
Input Common Mode Range
vs Temperature
Control and Full-Scale Amp Input
Bias Current vs Input Voltage
NULL VOLTAGE, REFERENCED TO V– (mV)
020
40
INVERTING
INPUT
BIAS
CURRENT
(
A)
60
100 120
80
140 160
1251/56 G24
200
150
100
50
0
–50
–100
–150
–200
TA = –55°C
TA = 125°C
VS = ±5V
VFS = 1.25V
TA = 25°C
Inverting Input Bias Current
vs Null Voltage
Inverting Input Bias Current
vs Null Voltage
NULL VOLTAGE, REFERENCED TO V– (mV)
050
INVERTING
INPUT
BIAS
CURRENT
(
A)
100
200
150
250
300
1251/56 G23
400
300
200
100
0
–100
–200
–300
–400
TA = –55°C
TA = 125°C
VS = ±5V
VFS = 2.5V
TA = 25°C
Positive Output Saturation
Voltage vs Load Current
LOAD CURRENT (mA)
0
SATURATION
VOLTAGE,
V
+ –
V
OUT
(V)
10
20
30
40
1251/56 G26
1.7
1.5
1.3
1.1
0.9
0.7
0.5
TA = –55°C
TA = 125°C
VS = ±5V
TA = 25°C
Negative Output Saturation
Voltage vs Load Current
3.0
2.5
2.0
1.5
1.0
0.5
1251/56 G27
LOAD CURRENT (mA)
0
SATURATION
VOLTAGE,
V
OUT
–
V
– (V)
–10
–20
–30
–40
TA = –55°C
TA = 125°C
VS = ±5V
TA = 25°C
Output Short-Circuit Current
vs Temperature
TEMPERATURE (°C)
–50
OUTPUT
SHORT-CIRCUIT
CURRENT
(mA)
60
50
40
30
25
75
1251/56 G28
–25
0
50
100
125
Supply Current vs
Full-Scale Voltage
Supply Current vs
Full-Scale Current
INPUT VOLTAGE (V)
0
INPUT
BIAS
CURRENT
(nA)
3
5
1251/56 G25
12
4
–400
–350
–300
–250
–200
–150
–100
–50
0
TA = –55°C
TA = 125°C
VS ≥ ±7.5V
TA = 25°C
FULL-SCALE VOLTAGE, VFS (V)
0
14
12
10
8
6
4
2
0
1.5
1251/56 G20
0.5
1.0
2.0
2.5
SUPPLY
CURRENT
(mA)
VS = ±5V
INTERNAL RESISTORS
TA = – 55°C,
TA = 25°C
TA = 125°C
FULL-SCALE CURRENT, IFS (A)
0
SUPPLY
CURRENT
(mA)
14
12
10
8
6
4
2
0
1251/56 G21
200
500
100
300
400
VS = ±5V
VC = 0V
TA = – 55°C
TA = 125°C
TEMPERATURE (
°C)
–50
–25
COMMON
MODE
RANGE
(V)
100
75
V+
V+ –1
V+ –2
V– +2
V– +1
V–
1251/56 G22
0
25
50
125