Datasheet

15
LT1251/LT1256
–
+
–
+
1MHz
CARRIER
AUDIO
MODULATION
2.5VDC
INPUT
50Ω
R
F2

1.5k
V
OUT
R
F1

1.5k
I
C
V
+
V
+
V
–
V
–
NULL
1251/56 TA03
2
–
+
–
+
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CONTROL
LT1256
1
C
0.1µF
220k
220k
220k
FS
5k5k
I
FS
0.1µF
0.1µF
–
+
LT1077
AM Modulator with DC Output Nulling Circuit
TYPICAL APPLICATIONS
U
10k
10k
5V
R
F1

1.5k
R
F2

1.5k
R
G2

1.5k
R
G1

1.5k
V1
V2
1251/56 TA06
2
8
9
14
13
7
121053
1
10µF
10µF
10µF
10µF
5V
5V
20k
20k
+
+
10µF
µP
V
C
R
C
R
FS
V
FS
V
+
V
–
–
+
–
+
LT1251/LT1256
1
2
V
REF
V
OUT
V
OUT
LTC1257
GND V
CC
D
IN

CLK
LOAD
+
+
+
Single Supply Noninverting AC Amplifier
with Digital Gain Control
Single Supply Inverting AC Amplifier
R2
20k

R1
20k
R
F1

1.5k
R
F2

1.5k
R
G1

1.5k
R
G2

1.5k
V
+
V1
V2
1251/56 TA05
2
8
9
14
13
7
121053
1
C1
10µF
5V
V
OUT
2.5VDC
INPUT
CONTROL
VOLTAGE
C
O
10µF

+
C2
10µF
+
V
C
R
C
R
FS
V
FS
V
+
V
–
–
+
LT1251/LT1256
2
–
+
1
+