Datasheet
LT1991
3
1991fh
The l denotes the specifications which apply over the operating
temperature range of 0°C to 70°C for C-grade parts and –40°C to 85°C for I-grade parts, otherwise specifications are at T
A
= 25°C.
Difference amplifier configuration, V
S
= 5V, 0V or ±15V; V
CM
= V
REF
= half supply, unless otherwise noted.
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
∆G Gain Error V
S
= ±15V, V
OUT
= ±10V; R
L
= 10k
G = 1; LT1991A
G = 1; LT1991
G = 3 or 9; LT1991A
G = 3 or 9; LT1991
l
l
l
l
±0.04
±0.08
±0.06
±0.12
%
%
%
%
GNL Gain Nonlinearity V
S
= ±15V; V
OUT
= ±10V; R
L
= 10k
l
1 10 ppm
∆G/∆T Gain Drift vs Temperature (Note 6) V
S
= ±15V; V
OUT
= ±10V; R
L
= 10k
l
0.3 3 ppm/°C
CMRR Common Mode Rejection Ratio,
Referred to Inputs (RTI)
V
S
= ±15V; V
CM
= ±15.2V
G = 9; LT1991A
G = 3; LT1991A
G = 1; LT1991A
Any Gain; LT1991
l
l
l
l
80
75
75
60
100
93
90
70
dB
dB
dB
dB
V
CM
Input Voltage Range (Note 7) P1/M1 Inputs
V
S
= ±15V; V
REF
= 0V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V; V
REF
= 1.25V
l
l
l
–28
–0.5
0.75
27.6
5.1
2.35
V
V
V
P1/M1 Inputs, P9/M9 Connected to REF
V
S
= ±15V; V
REF
= 0V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V; V
REF
= 1.25V
l
l
l
–60
–14
–1.5
60
16.8
7.3
V
V
V
P3/M3 Inputs
V
S
= ±15V; V
REF
= 0V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V; V
REF
= 1.25V
l
l
l
–15.2
0.5
0.95
15.2
4.2
1.95
V
V
V
P9/M9 Inputs
V
S
= ±15V; V
REF
= 0V
V
S
= 5V, 0V; V
REF
= 2.5V
V
S
= 3V, 0V; V
REF
= 1.25V
l
l
l
–15.2
0.85
1.0
15.2
3.9
1.9
V
V
V
V
OS
Op Amp Offset Voltage (Note 8) LT1991AMS, V
S
= 5V, 0V
l
15 50
135
µV
µV
LT1991AMS, V
S
= ±15V
l
15 80
160
µV
µV
LT1991MS
l
25 100
200
µV
µV
LT1991DD
l
25 150
250
µV
µV
∆V
OS
/∆T Op Amp Offset Voltage Drift (Note 6)
l
0.3 1 µV/°C
IB Op Amp Input Bias Current (Note 11)
l
2.5 5
7.5
nA
nA
I
OS
Op Amp Input Offset Current (Note 11) LT1991A
l
50 500
750
pA
pA
LT1991
l
50 1000
1500
pA
pA
Op Amp Input Noise
Voltage 0.01Hz to 1Hz
0.01Hz to 1Hz
0.1Hz to 10Hz
0.1Hz to 10Hz
0.35
0.07
0.25
0.05
µV
P-P
µV
RMS
µV
P-P
µV
RMS
e
n
Input Noise Voltage Density G = 1; f = 1kHz
G = 9; f = 1kHz
180
46
nV/√Hz
nV/√Hz