LT1251/LT1256
TYPICAL APPLICATIONS
U
Controlled Gain, Voltage-to-Current Converter
(Current Source)
R
F
1k
R
F
1k
R
G
100Ω
LT1256
× 4
1
2
+
–
1
2
R
O
V
IN
1k
8
I
OUT
14
13
+
–
+
LT1363
V
C
R
R
V
FS
C
FS
3
5
10 12
–
2.5VDC
INPUT
CONTROL
VOLTAGE
R
1k
F
R
F
1k
1251/56 TA09
V
R
R
R
V
OUTPUT RESISTANCE DEPENDS
ON MATCHING OF RESISTORS
IN
F
C
I
=
OUT
(
)
V
O
G
FS
Variable Lowpass, Highpass and Allpass Filter
R2
R1
R3
–
V
IN
INVERTED
HIGHPASS
LT1252
BASIC VARIABLE INTEGRATOR
+
R
R
R
C
ALLPASS
1.5k
R4
LT1256
2
1
–
+
1
2
R1 R3
=
8
R2 R4
LOWPASS
14
13
+
–
V
C
R
C
R
FS
V
FS
3
5
10 12
1.5k
V
FS
V
C
R
C
R
DC
10k
1251/56 TA13
16