LT1991 Linear Technology, LT1991 Datasheet - Page 17

• Manufacturer Part Number: LT1991
• Description: Precision / 100uA Gain Selectable Amplifier
• Manufacturer: Linear Technology

APPLICATIONS INFORMATION
V
V
IN
IN
V
IN
10
10
10
8
9
1
2
3
8
9
1
2
3
8
9
1
2
3
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
V
GAIN = –0.25
V
V
LT1991
V
LT1991
V
LT1991
V
EE
EE
GAIN = –3
EE
GAIN = –6
S
S
S
4
–
4
–
4
–
V
V
V
V
V
V
CC
CC
CC
S
S
S
V
+
+
+
7
7
7
IN
REF
REF
REF
5
5
5
OUT
OUT
OUT
Figure 9. It Is Simple to Get Precision Inverting Gains with the LT1991.
Input Impedance Varies from 45kΩ (Gain = –13) to 450kΩ (Gain = –1).
10
8
9
1
2
3
M9
M3
M1
P1
P3
P9
6
6
6
V
LT1991
V
GAIN = –12
EE
S
4
V
V
V
–
V
OUT
OUT
OUT
V
CC
S
+
7
REF
5
OUT
V
V
V
IN
IN
IN
6
10
10
10
8
9
1
2
3
8
9
1
2
3
8
9
1
2
3
V
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
OUT
V
V
V
LT1991
LT1991
LT1991
V
V
V
EE
EE
EE
GAIN = –1
GAIN = –4
GAIN = –9
S
S
S
4
–
4
–
4
–
V
V
V
V
V
V
CC
CC
CC
S
S
S
+
+
7
7
7
+
REF
REF
REF
V
5
5
5
OUT
OUT
OUT
IN
10
6
6
6
8
9
1
2
3
M9
M3
M1
P1
P3
P9
V
V
V
V
OUT
OUT
OUT
LT1991
V
GAIN = –13
EE
S
4
–
V
V
CC
S
V
7
V
+
IN
REF
IN
V
5
OUT
IN
10
10
10
6
8
9
1
2
3
8
9
1
2
3
8
9
1
2
3
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
M9
M3
M1
P1
P3
P9
V
OUT
V
GAIN = –2.25
V
V
LT1991
LT1991
GAIN = –4.5
LT1991
V
V
V
GAIN = –10
EE
EE
EE
www.DataSheet4U.com
S
S
S
4
4
4
–
–
–
V
V
V
V
V
V
CC
CC
CC
S
S
S
7
+
7
7
+
+
REF
REF
REF
5
5
5
OUT
OUT
OUT
LT1991
6
6
6
1991 F09
17
V
V
V
OUT
OUT
OUT
1991fg