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LT1256CS датащи(PDF) 12 Page - Linear Technology

номер детали LT1256CS
подробное описание детали  40MHz Video Fader and DC Gain Controlled Amplifier
PDF  24 Pages
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производитель  LINER [Linear Technology]
домашняя страница  http://www.linear.com
Logo LINER - Linear Technology

LT1256CS датащи(HTML) 12 Page - Linear Technology

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12
LT1251/LT1256
APPLICATIONS INFORMATION
Figure 2 is the basic block diagram of the LT1251/LT1256
signal path with external resistors RG1, RF1, RG2 and RF2.
Both input stages are operating as noninverting amplifiers
with two input signals V1 and V2.
Each input stage has a unity-gain buffer from the nonin-
verting input to the inverting input. Therefore, the inverting
input is at the same voltage as the noninverting input. R1
and R2 represent the internal output resistances of these
buffers, approximately 27
Ω.
K is a constant determined by the control circuit and can
be any value between 0 and 1. The control circuit is
described in a later section.
By inspection of the diagram:
I
V
R
RR
RR
V
RR
R
R
GF
GF
O
F
F
G
1
1
1
11
11
11
1
1
1
=
+ ()( )
+
−
++


Substituting and rearranging gives:
I
V
R
RR
RR
V
RR
R
R
IKI
K I
VI
R
sR C
GF
GF
O
F
F
G
O
OO
OL
OL
2
2
2
22
22
22
2
2
12
1
1
1
=
+ ()(
)
+
−
++


=+ −
()
=
+
()
General Equation for the Noninverting Amplifier Case
V
KV
R
RR
RR
KV
R
RR
RR
sR C
R
K
RR
R
R
K
RR
R
R
O
GF
GF
GF
GF
OL
OL
F
F
G
F
F
G
=
+ ()( )
+
+
−
()
+ ()(
)
+
+
+
++


+
−
()
++


1
1
11
11
2
2
22
22
11
1
1
22
2
2
1
1
1
1
1
–
+
Σ
1
14
K
I1
IO
8
C
VO
1251/56 BD
I1
I2
I2
1 – K
R1
V1
V2
R2
RG2
RG1
ROL
RF1
RF2
2
13
+1
–
+
1
2
Figure 2. Signal Path Block Diagram
Signal Path Description



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