Datasheet

LTC1992 Family
26
1992fb
APPLICATIONS INFORMATION
Figure 1. Comparison of an Op Amp and a Fully Differential Amplifier
Figure 2. LTC1992 Functional Block Diagram with External Gain Setting Resistors
–
–
+
+
–
–
+
+
1992 F01
R
IN
R
IN
R
FB
R
FB
Fully Differential Amplifier with Negative Feedback
Fully Differential Amplifier
–V
IN
+V
IN
V
OCM
V
OCM
V
OCM
–V
OUT
+V
OUT
–
+
R
IN
R
FB
Op Amp with Negative Feedback
V
IN
V
OUT
R
FB
R
IN
GAIN = –
R
FB
R
IN
GAIN = –
+OUT
• DIFFERENTIAL INPUT
• HIGH OPEN-LOOP GAIN
• DIFFERENTIAL OUTPUT
• V
OCM
INPUT SETS OUTPUT
COMMON MODE LEVEL
–OUT
–IN
+IN
V
OCM
–
+
Op Amp
OUT
LTC1992
A
O
LTC1992
A
O
LTC1992LTC1992
• DIFFERENTIAL INPUT
• HIGH OPEN-LOOP GAIN
• SINGLE-ENDED OUTPUT
–IN
+IN
+
–
7
2
6
3
+
–
R
MID1
200k
R
MID2
200k
INP
INM
V
+
V
–
R
CMP
30k
R
CMM
30k
A1
S
P
LTC1992
S
M
+
+
+
–
A2
+OUT
1992 F02
–IN
+V
IN
–V
IN
R
IN
R
FB
R
IN
V
MID
V
OCM
+IN
–OUT
–V
OUT
+V
OUT
+V
S
–V
S
5
4
R
FB
1
8