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LT1251CS Datasheet(PDF) 17 Page - Linear Technology

Part # LT1251CS
Description  40MHz Video Fader and DC Gain Controlled Amplifier
PDF  24 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1251CS Datasheet(HTML) 17 Page - Linear Technology

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



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