LT1991
ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. Difference amplifier configuration, VS = 5V, 0V or ±15V;
CM = VREF = half supply, unless otherwise noted.
V
SYMBOL
V
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Input Voltage Range (Note 7)
P1/M1 Inputs, P9/M9 Connected to REF
CM
V = ±15V; V = 0V
●
●
●
–60
–14
–1.5
60
16.8
7.3
V
V
V
S
REF
V = 5V, 0V; V = 2.5V
S
REF
V = 3V, 0V; V = 1.25V
S
REF
P3/M3 Inputs
V = ±15V; V = 0V
●
●
●
–15.2
0.5
0.95
15.2
4.2
1.95
V
V
V
S
REF
V = 5V, 0V; V = 2.5V
S
REF
V = 3V, 0V; V = 1.25V
S
REF
P9/M9 Inputs
V = ±15V; V = 0V
●
●
●
–15.2
0.85
1.0
15.2
3.9
1.9
V
V
V
S
REF
V = 5V, 0V; V = 2.5V
S
REF
V = 3V, 0V; V = 1.25V
S
REF
V
Op Amp Offset Voltage (Note 8)
LT1991AMS, V = 5V, 0V
15
15
25
25
50
135
µV
µV
OS
S
●
●
●
LT1991AMS, V = ±15V
80
160
µV
µV
S
LT1991MS
LT1991DD
100
200
µV
µV
150
250
µV
µV
●
●
∆V /∆T
Op Amp Offset Voltage Drift (Note 6)
Op Amp Input Bias Current
0.3
2.5
1
µV/°C
OS
I
5
7.5
nA
nA
B
●
●
●
I
Op Amp Input Offset Current
LT1991A
LT1991
50
50
500
750
pA
pA
OS
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
Input Noise Voltage Density
Input Impedance (Note 10)
G = 1; f = 1kHz
G = 9; f = 1kHz
180
46
nV/√Hz
nV/√Hz
n
R
P1 (M1 = Ground)
P3 (M3 = Ground)
P9 (M9 = Ground)
●
●
●
630
420
350
900
600
500
1170
780
650
kΩ
kΩ
kΩ
IN
M1 (P1 = Ground)
M3 (P3 = Ground)
M9 (P9 = Ground)
●
●
●
315
105
35
450
150
50
585
195
65
kΩ
kΩ
kΩ
∆R
Resistor Matching
(Note 9)
450k Resistors, LT1991A
Other Resistors, LT1991A
450k Resistors, LT1991
Other Resistors, LT1991
●
●
●
●
0.01
0.02
0.02
0.04
0.04
0.06
0.08
0.12
%
%
%
%
∆R/∆T
Resistor Temperature Coefficient (Note 6) Resistor Matching
Absolute Value
●
●
0.3
–30
3
ppm/°C
ppm/°C
PSRR
Power Supply Rejection Ratio
Minimum Supply Voltage
V = ±1.35V to ±18V (Note 8)
S
●
●
105
135
2.4
dB
V
2.7
1991fb
3
Linear Systems [ Linear Systems ]
