參數(shù)資料
型號: LT1251CN
廠商: LINEAR TECHNOLOGY CORP
元件分類: 運動控制電子
英文描述: 40MHz Video Fader and DC Gain Controlled Amplifier
中文描述: OP-AMP, 3000 uV OFFSET-MAX, 40 MHz BAND WIDTH, PDIP14
封裝: 0.300 INCH, PLASTIC, DIP-14
文件頁數(shù): 13/24頁
文件大?。?/td> 474K
代理商: LT1251CN
13
LT1251/LT1256
APPLICATIO
S I
N
FOR
ATIO
U
In low gain applications, R
1
and R
2
are small compared to
the feedback resistors and therefore we can simplify the
equation to:
(
(
+
(
1
W
U
V
KV
)( )
+
1
R
R
R
R
K V
)
)(
R
R
R
R
1
sR C
R
OL
K
R
K
R
O
G
F
G
F
G
F
G
F
F
F
=
(
+
)
+
+
+
)
1
1
1
2
2
2
2
2
2
1
1
Note that the denominator causes a gain error due to the
open-loop gain (typically 0.1% for frequencies below
20kHz) and for mismatches in R
F1
and R
F2
. A 1% mis-
match in the feedback resistors results in a 0.25% error at
K = 0.5.
If we set R
F1
= R
F2
and assume R
OL
>> R
F1
(a 0.1% error
at low frequencies) the above equation simplifies to:
(
and
V
KV A
K V A
)
where A
R
R
A
R
R
O
V
V
V
F
G
V
F
G
=
+
= +
1
= +
1
1
2
1
1
1
2
2
2
1
This shows that the output fades linearly from input 2,
times its gain, to input 1, times its gain, as K goes from
0 to 1.
If only one input is used (for example, V
1
) and Pin 14 is
grounded, then the gain is proportional to K.
V
V
KA
O
V
1
1
=
Similarly for the inverting case where the noninverting
inputs are grounded and the input voltages V
1
and V
2
drive
the normally grounded ends of R
G1
and R
G2
, we get:
General Equation for the Inverting Amplifier Case
V
KV
R
R
R
R
K V
R
R
R
R
sR C
R
OL
K
R
R
R
R
K
R
R
R
R
O
G
G
F
G
G
F
(
F
F
G
F
F
G
=
+
+
+
(
+
+
)
+
+
+
+
+
+
+
1
1
1
1
1
2
2
2
2
2
1
1
1
1
1
2
2
2
2
1
1
1
1
1
1
Note that the denominator is the same as the noninverting
case. In low gain applications, R
1
and R
2
are small
compared to the feedback resistors and therefore we can
simplify the equation to:
V
KV
R
K V
)
2
R
sR C
R
OL
K
R
K
R
O
G
G
F
F
=
+
(
+
+
+
(
)
1
1
2
1
2
1
1
1
Again, if we set R
F1
= R
F2
and assume R
OL
>> R
F1
(a 0.1%
error at low frequencies) the above equation simplifies to:
[
1
and
V
KV A
K V A
)
where A
R
R
A
R
R
O
V
V
V
F
G
V
F
G
=
+
(
]
=
=
1
2
1
1
2
2
2
1
The 4-resistor difference amplifier yields the same result
as the inverting amplifier case, and the common mode
rejection is independent of K.
相關PDF資料
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