Datasheet

24
LT1251/LT1256
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone]
●
FAX : [phone]
●
TELEX : 499-3977
LT/GP 0896 REV A 5K • PRINTED IN USA
 LINEAR TECHNOLOGY CORPORATION 1994
TYPICAL APPLICATIONS
U
4-Quadrant Multiplier as a Double-Sideband Suppressed-Carrier Modulator
Modulation Gain vs Control Voltage
–
+
–
+
1MHz
CARRIER
MODULATION
10k
10k*
R
F2

1.5k
V
OUT
R
F1

1.5k
I
C
V
+
V
–
1251/56 TA04a
2
–
+
–
+
1
2
3
4
5
6
7
14
13
12
11
10
9
8
CONTROL
LT1256
1
CFS
5k5k
I
FS
0.1µF
0.1µF
*TRIM FOR SYMMETRY
2.5VDC
INPUT
R
G1

1.5k
CONTROL VOLTAGE, PIN 3 (V)
0
GAIN (V/V)
1.0
0.8
0.6
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
2.0
1251/56 TA04b
0.5
1.0
1.5
2.5
V
S
= ±5V
V
FS
= 2.5V
1.5k
1.5k
1N914
1N914
1k
5k
V
IN
1251/56 TA10a
2
8
200pF
2.5VDC
INPUT
14
13
121053
1
V
OUT
V
C
R
C
R
FS
V
FS
LT1256
–
+
–
+
2
1
9
7
V
+
V
–
Soft Clipper
V
FS
= 2.5V
V
S
= ±5V
f = 1kHz
1251/56 TA10b
V
IN
V
OUT
PART NUMBER DESCRIPTION COMMENTS
LT1228 100MHz Current Feedback Amplifier with DC Gain Control Includes a 75MHz Transconductance Amplifier
LT1252 Low Cost Video Amplifier 100MHz Bandwidth
LT1253/LT1254 Low Cost Dual and Quad Video Amplifiers 90 MHz Bandwidth
LT1259/LT1260 Low Cost Dual and Triple 130MHz Current Feedback Makes Fast Video MUX
Amplifiers with Shutdown
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