Datasheet

5
LT1787/LT1787HV
1787fc
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the temperature range –40°C ≤ T
A
≤ 85°C, otherwise specifications are at
T
A
= 25°C. Total supply = (V
S
–
– V
EE
) = 2.5V to 36V (LT1787I), 2.5V to 60V (LT1787HVI) unless otherwise specified. (Note 5)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Unipolar Output V
SENSE
= 2mV, V
BIAS
= 0V 32 50 mV
Saturation Voltage V
SENSE
= 4mV, V
BIAS
= 0V 38 55 mV
V
SENSE
= 5mV, V
BIAS
= 0V 43 60 mV
V
SENSE
= 6mV, V
BIAS
= 0V 49 65 mV
V
SENSE
= 2mV, V
BIAS
= 0V ● 32 56 mV
V
SENSE
= 4mV, V
BIAS
= 0V ● 38 61 mV
V
SENSE
= 5mV, V
BIAS
= 0V ● 43 66 mV
V
SENSE
= 6mV, V
BIAS
= 0V ● 49 71 mV
V
OMAX
Maximum Output Voltage V
S
+
– 0.75 V
R
G1A,
R
G2A
Input Gain-Setting Resistor Pin 1 to Pin 2, Pin 7 to Pin 8 1.25 kΩ
R
OUT
Output Resistor Pin 5 to Pin 6 20 kΩ
V
S
–
, V
S
+
Sense Amplifier Supply Voltage Single Supply Operation (LT1787H) ● 2.5 36 V
Single Supply Operation (LT1787HVH)
● 2.5 60 V
V
SENSE
Input Sense Voltage Full Scale V
SENSE
= V
S
+
– V
S
–
, V
S
= 10V, V
BIAS
= 5V, A
V
= 8 ±10% ● 500 mV
V
OS
Input Offset Voltage I
OUT
= 0, V
S
Supply = 5V – 75 ± 40 75 µV
–40°C ≤ T
A
≤ 125°C ● –400 400 µV
I
OUT
= 0 (LT1787H) –100 100 µV
–40°C ≤ T
A
≤ 125°C ● –550 550 µV
I
OUT
= 0 (LT1787HVH) –100 100 µV
–40°C ≤ T
A
≤ 125°C ● –550 550 µV
V
OS
TC Temperature Coefficient of V
OS
V
S
Supply = 5V (Note 6) ● 0.5 4 µV/°C
I
OUT(O)
No-Load Output Current Error V
SENSE
= 0V 4 nA
V
OUT(O)
No-Load Output Voltage Error V
SENSE
= 0V, V
S
Supply = 5V –600 600 µV
–40°C ≤ T
A
≤ 125°C ● –3200 3200 µV
g
m
Tranconductance, I
OUT
/V
SENSE
±V
SENSE
= 10mV, 50mV, 100mV, 150mV, 250mV, 400 µA/V
V
S
Supply = Total Supply + |V
SENSE
|
A
V
Gain, V
OUT
/V
SENSE
±V
SENSE
= 100mV, V
S
Supply = 5V ● 7.76 8 8.24 V/V
Output Voltage Gain Error ±V
SENSE
= 100mV, V
S
Supply = 5V ● –3 1 3 %
V
S
PSRR V
S
Supply Rejection Ratio V
SENSE
= 0V, V
S
Supply = 2.5V to 36V (LT1787H) ● 100 130 dB
V
SENSE
= 0V, V
S
Supply = 2.5V to 60V (LT1787HVH) ● 100 130 dB
V
EE
PSRR Negative Supply Rejection Ratio V
SENSE
= 0V, V
S
Supply = 15V, V
BIAS
= 0V, ● 100 130 dB
V
EE
= –1V to – 15V (LT1787H)
V
SENSE
= 0V, V
S
Supply = 40V, V
BIAS
= 0V, ● 100 130 dB
V
EE
= –1V to – 15V (LT1787HVH)
∆V
OS
Change in Input Offset Voltage V
SENSE
= 0V, V
S
Supply = 36V, V
BIAS
= 0.5V to 25V (LT1787H) ● 100 130 dB
∆V
BIAS
with Change in V
BIAS
Voltage V
SENSE
= 0V, V
S
Supply = 60V, V
BIAS
= 0.5V to 25V (LT1787HVH) ● 100 130 dB
I
S
+
(O)
Positive Input Sense Current V
SENSE
= 0V ● 10 25 µA
I
S
–
(O)
Negative Input Sense Current V
SENSE
= 0V ● 50 115 µA
I
EE(O)
Negative Supply Current V
SENSE
= 0V ● 60 140 µA
I
OUT
Output Current V
SENSE
= ±128mV ±50 µA
V
OUT
Output Voltage V
SENSE
= ±128mV, V
S
+
≥ 3.3V V
BIAS
±1.024 V
Ripple Rejection V
S
+
= V
S
–
= 20V, ∆V
S
Supply = 1V, f = 1kHz ● 80 88 dB
The ● denotes the specifications which apply over the temperature range –40°C ≤ T
A
≤ 125°C, otherwise specifications are at
T
A
= 25°C. Total supply = (V
S
–
– V
EE
) = 2.5V to 36V (LT1787H), 2.5V to 60V (LT1787HVH) unless otherwise specified. (Note 5)