Datasheet

LTC1992 Family
29
1992fb
APPLICATIONS INFORMATION
Figure 4. Basic Fully Differential Amplifier Application Circuits (Note: Single-Ended to Differential Conversion is
Easily Accomplished by Connecting One of the Input Nodes, +V
IN
or –V
IN
, to a DC Reference Level (e.g., Ground))
–
–
+
+
R
IN
R
IN
R
FB
R
FB
Gain Block
–V
IN
+V
IN
V
OCM
–V
OUT
+V
OUT
–
+
R
IN
V
IN
R
FB
V
OUT
R
FB
R
IN
GAIN =
LTC1992
–
–
+
+
R
IN
R
IN
R
FB
R
FB
AC Coupled Gain Block
–V
IN
+V
IN
V
OCM
–V
OUT
+V
OUT
–
+
R
IN
C
IN
C
IN
C
IN
V
IN
R
FB
V
OUT
LTC1992
–
–
+
+
R
IN
R
IN
R
FB
R
FB
Single Pole Lowpass Filter
–V
IN
+V
IN
R
FB
R
IN
W
P
S + W
P
; W
P
=
V
OCM
–V
OUT
+V
OUT
–
+
R
IN
V
IN
R
FB
C
V
OUT
H
(S)
= H
O
•
WHERE H
O
=
LTC1992
C
C
1
R
FB
• C
–
–
+
+
R1
R3
R3
R4
R4R1
R2
R2
3-Pole Lowpass Filter
–V
IN
+V
IN
R2
R1
; W
P
=; W
O
=
V
OCM
–V
OUT
1992 F04
+V
OUT
–
+
R1 R3
R4
R2
C1
C2
V
OUT
WHERE H
O
=
LTC1992
C3
C1
C1
1
R4C3
1
R2R3C1C2
C2
2
C3
2
W
P
S + W
P
H
(S)
= H
O
()
W
O
2
S
2
+ S +
W
O
Q
W
O
2
()
V
IN
R
FB
R
IN
; W
P
=
H
O
=
1
R
IN
• C
IN
S
S + W
P
H
(S)
= H
O
•
C2
C1
R1 • √R2R3
R1 R2 + R1 R2 + R2 R3
•
Q =