LT1251 Linear Technology, LT1251 Datasheet - Page 17

• Manufacturer Part Number: LT1251
• Description: 40MHz Video Fader and DC Gain Controlled Amplifier
• Manufacturer: Linear Technology

TYPICAL APPLICATIONS
1.6k
100pF
V
IN
V
100pF
1.6k
IN
1.5k
2k
6k
200
200
600
200
1MHz Wien Bridge Oscillator
14
13
1k
1k
1
2
CONTROL
14
13
VOLTAGE
CONTROL
VOLTAGE
2
1
14
10 F
V
13
–
+
+
–
1
2
C
V
3
1
–
+
+
–
LT1251/LT1256
2
C
3
1
+
LT1251/LT1256
2
R
V
+
–
+
–
C
R
C
3
1
2
5
LT1251/LT1256
C
1.5k
5
10k
U
1.5k
R
R
6k
6k
C
FS
R
10
5
FS
10
7
R
2.5VDC
INPUT
2.5VDC
V
INPUT
FS
5, 4, 6
FS
V
V
10
V
12
FS
–
V
Logarithmic Gain Control (Noninverting)
+
V
12
–
+
LT1116
Logarithmic Gain Control (Inverting)
V
8
9
7
1251/56 TA07a
1251/56 TA08a
FS
8
9
5V
7
12
1
8
+
–
2
3
V
V
OUT
OUT
1k
2.5VDC
INPUT
1251/56 TA11
50
V
OUT
–15
–15
15
15
0
0
V
IN
0
0
T(s) =
THE TIME CONSTANT IS INVERSELY PROPORTIONAL TO V
R
THE CONTROL IS AT ZERO.
V
V
DC
FS
FS
R
IS REQUIRED TO DEFINE THE DC OUTPUT WHEN
R
= 2.5V
= 2.5V
(s)(R)(C)
CONTROL VOLTAGE (V)
CONTROL VOLTAGE (V)
–1
Basic Variable Integrator
1.5k
1.5k
14
13
V
V
1
2
FS
C
<1dB ERROR
1.25
<1dB ERROR
1.25
A
A
V
V
V
V
–
+
+
–
LT1251/LT1256
C
C
3
= 24dB
= 24dB
1
2
R
LT1256
C
5
R
DC
V
V
V
V
R
FS
FS
C
C
C
FS
10
1251/56 TA07b
1251/56 TA08b
– 0.5
– 0.5
C
10k
V
V
FS
FS
12
2.5
2.5
8
17
1251/56 TA12
V
OUT
C
.