Datasheet
LT1991
4
1991fh
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
R
IN
Input Impedance (Note 10) P1 (M1 = Ground)
P3 (M3 = Ground)
P9 (M9 = Ground)
l
l
l
630
420
350
900
600
500
1170
780
650
kΩ
kΩ
kΩ
M1 (P1 = Ground)
M3 (P3 = Ground)
M9 (P9 = Ground)
l
l
l
315
105
35
450
150
50
585
195
65
kΩ
kΩ
kΩ
∆R Resistor Matching (Note 9) 450k Resistors, LT1991A
Other Resistors, LT1991
A
450k Resistors, LT1991
Other Resistors, LT1991
l
l
l
l
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
l
l
0.3
–30
3 ppm/°C
ppm/°C
PSRR Power Supply Rejection Ratio V
S
= ±1.35V to ±18V (Note 8)
l
105 135 dB
Minimum Supply Voltage
l
2.4 2.7 V
V
OUT
Output Voltage Swing (to Either Rail) No Load
V
S
= 5V, 0V
V
S
= 5V, 0V
V
S
= ±15V
l
l
40
55
65
110
mV
mV
mV
1mA Load
V
S
= 5V, 0V
V
S
= 5V, 0V
V
S
= ±15V
l
l
150
225
275
300
mV
mV
mV
I
SC
Output Short-Circuit Current (Sourcing) Drive Output Positive;
Short Output to Ground
l
8
4
12 mA
mA
Output Short-Circuit Current (Sinking) Drive Output Negative;
Short Output to V
S
or Midsupply
l
8
4
21 mA
mA
BW –3dB Bandwidth G = 1
G = 3
G = 9
110
78
40
kHz
kHz
kHz
GBWP Op Amp Gain Bandwidth Product f = 10kHz 560 kHz
t
r
, t
f
Rise Time, Fall Time G = 1; 0.1V Step; 10% to 90%
G = 9; 0.1V Step; 10% to 90%
3
8
µs
µs
t
s
Settling Time to 0.01% G = 1; V
S
= 5V, 0V; 2V Step
G = 1; V
S
= 5V, 0V; –2V Step
G = 1; V
S
= ±15V, 10V Step
G
= 1; V
S
= ±15V, –10V Step
42
48
114
74
µs
µs
µs
µs
SR Slew Rate V
S
= 5V, 0V; V
OUT
= 1V to 4V
V
S
= ±15V; V
OUT
= ±10V; V
MEAS
= ±5V
l
l
0.06
0.08
0.12
0.12
V/µs
V/µs
I
s
Supply Current V
S
= 5V, 0V
l
100 110
150
µA
µA
V
S
= ±15V
l
130 160
210
µA
µA
ELECTRICAL CHARACTERISTICS
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.