Datasheet

7
LT1787/LT1787HV
1787fc
Output Voltage vs Sense Voltage
(Unidirectional Mode)
Gain vs FrequencyGain vs Temperature
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
SENSE VOLTAGE (V
S
+
– V
S
–
) (mV)
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
120
1787 G07
30 60 90 150
OUPUT VOLTAGE (V)
V
S
= 2.5V TO 60V
T
A
= –40°C TO 85°C
V
BIAS
= V
EE
TEMPERATURE (°C)
–40
GAIN (V/V)
8.195
8.185
8.175
8.165
8.155
8.145
8.135
–20 0 20 40 60
1787 G08
80
85
V
S
= (2.5V + |V
SENSE
|)TO 60V
V
S
+
> V
S
–
V
S
+
< V
S
–
FREQUENCY (Hz)
0.1k 1k
GAIN (dB)
10k 1M100k
10M
100M
1787 G09
30
20
10
0
–10
–20
–30
–40
–50
V
SENSE
= 10mV
Input Offset Voltage vs
Negative Supply Voltage
Output Voltage vs Sense Voltage
(Bidirectional Mode)
Input Offset Voltage vs
Temperature
NEGATIVE SUPPLY VOLTAGE (V)
0
INPUT OFFSET VOLTAGE (µV)
30
20
10
0
–10
–20
–30
–5 –10 –15 –20 –25
1787 G04
–30
T
A
= 25°C
T
A
= 85°C
V
S
+
= V
S
–
= 2.5V
V
BIAS
= 1V
T
A
= –40°C
TEMPERATURE (°C)
–40
INPUT OFFSET VOLTAGE (µV)
50
40
30
20
10
0
–10
–20
–30
–40
–50
–20 0 20 40 60
1787 G05
80
85
V
S
+
= V
S
–
V
BIAS
= 0V
V
EE
= –1.25V
SENSE VOLTAGE (V
S
+
– V
S
–
) (mV)
–250
OUTPUT VOLTAGE (V)
2.5
2.0
1.5
1.0
0.5
V
BIAS
–0.5
–1.0
–1.5
–2.0
–2.5
150
1787 G06
–150
–50
50
250
V
S
= 5.5V TO 60V
V
BIAS
= 2.5V
V
EE
= 0V
Supply Current vs Supply Voltage
Negative Input Sense Current vs
Sense Voltage
TOTAL SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
75
70
65
60
55
50
45
40
1787 G10
0
10
20 30 40 50 60
T
A
= 85°C
T
A
= 25°C
T
A
= –40°C
V
S
+
= V
S
–
SENSE VOLTAGE (V
S
+
– V
S
–
) (mV)
–128
NEGATIVE INPUT SENSE CURRENT (µA)
120
110
100
90
80
70
60
50
40
30
–64
0
32
1787 G11
–96 –32
64
96
128
V
S
= (2.5V + |V
SENSE
|) TO 60V
T
A
= 25°C
T
A
= 85°C
T
A
= –40°C
SENSE VOLTAGE (V
S
+
– V
S
–
) (mV)
–128
POSITIVE INPUT SENSE CURRENT (µA)
60
50
40
30
20
10
0
–64
0
32
1787 G17
–96 –32
64
96
128
V
S
= (2.5V + |V
SENSE
|) TO 60V
T
A
= 85°C
T
A
= –40°C
T
A
= 25°C
Positive Input Sense Current vs
Sense Voltage