LT1251/LT1256
U
TYPICAL APPLICATIONS
4-Quadrant Multiplier as a Double-Sideband Suppressed-Carrier Modulator
Modulation Gain vs Control Voltage
1.0
0.8
V
V
= ±5V
FS
S
= 2.5V
LT1256
1
2
3
4
5
6
7
14
13
12
11
10
9
0.6
+
–
+
–
R
G1
1
0.4
2
1.5k
MODULATION
0.2
CONTROL
1MHz
CARRIER
0
+
–
+
–
I
FS
I
C
FS
5k
C
–0.2
–0.4
–0.6
–0.8
–1.0
0.1µF
10k*
R
R
F1
1.5k
F2
1.5k
5k
+
V
10k
8
–
0
0.5
1.0
1.5
2.0
2.5
V
CONTROL VOLTAGE, PIN 3 (V)
V
OUT
2.5VDC
INPUT
1251/56 TA04b
1251/56 TA04a
0.1µF
*TRIM FOR SYMMETRY
Soft Clipper
1.5k
VIN
LT1256
2
1
–
+
1
2
8
V
OUT
9
+
14
13
+
–
V
V
IN
7
–
V
VOUT
V
R
R
V
FS
C
C
FS
3
5
10 12
2.5VDC
INPUT
1N914
1N914
VFS = 2.5V
S = ±5V
f = 1kHz
V
200pF
5k 1k
1251/56 TA10b
1.5k
1251/56 TA10a
RELATED PARTS
PART NUMBER
DESCRIPTION
COMMENTS
LT1228
100MHz Current Feedback Amplifier with DC Gain Control
Low Cost Video Amplifier
Includes a 75MHz Transconductance Amplifier
100MHz Bandwidth
LT1252
LT1253/LT1254
LT1259/LT1260
Low Cost Dual and Quad Video Amplifiers
90 MHz Bandwidth
Low Cost Dual and Triple 130MHz Current Feedback
Amplifiers with Shutdown
Makes Fast Video MUX
LT/GP 0896 REV A 5K • PRINTED IN USA
LINEAR TECHNOLOGY CORPORATION 1994
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
24
●
●
(408) 432-1900 FAX: (408) 434-0507 TELEX: 499-3977
Linear [ Linear ]
