LT1256CN Linear Technology, LT1256CN Datasheet - Page 13
![IC AMP VIDEO FADE CONTRLD 14-DIP](/photos/6/83/68354/161-14-dip_sml.jpg)
LT1256CN
Manufacturer Part Number
LT1256CN
Description
IC AMP VIDEO FADE CONTRLD 14-DIP
Manufacturer
Linear Technology
Datasheet
1.LT1256CSPBF.pdf
(24 pages)
Specifications of LT1256CN
Applications
Current Feedback
Number Of Circuits
1
-3db Bandwidth
40MHz
Slew Rate
300 V/µs
Current - Supply
14.5mA
Current - Output / Channel
40mA
Voltage - Supply, Single/dual (±)
5 V ~ 30 V, ±2.5 V ~ 15 V
Mounting Type
Through Hole
Package / Case
14-DIP (0.300", 7.62mm)
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LT1256CN#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
APPLICATIONS
In low gain applications, R
the feedback resistors and therefore we can simplify the
equation to:
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
match in the feedback resistors results in a 0.25% error at
K = 0.5.
If we set R
at low frequencies) the above equation simplifies to:
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
grounded, then the gain is proportional to K.
V
where A
V
V
O
O
1
KA
1
R
R
F1
G
V
G
R
V
sR C
1
O
KV
1
= R
OL
V
1
1
OL
1
R
R
F2
KV A
F
F
1
1
1
and assume R
1
U
R
R
R
V
K
1
G
F
F
R
R
1
1
1
INFORMATION
1
G
G
U
1
2
2
1
and
and R
K V
1
R
R
R
K V A
F
F
F
2
2
2
K
2
A
2
OL
F1
2
V
are small compared to
W
2
>> R
and R
V
2
1
F1
1
) and Pin 14 is
F2
R
R
(a 0.1% error
. A 1% mis-
F
G
2
2
U
Note that the denominator is the same as the noninverting
case. In low gain applications, R
compared to the feedback resistors and therefore we can
simplify the equation to:
Again, if we set R
error at low frequencies) the above equation simplifies to:
The 4-resistor difference amplifier yields the same result
as the inverting amplifier case, and the common mode
rejection is independent of K.
Similarly for the inverting case where the noninverting
inputs are grounded and the input voltages V
the normally grounded ends of R
V
O
V
where A
O
General Equation for the Inverting Amplifier Case
1
R
sR C
1
OL
V
O
R
OL
V
R
sR C
G
1
OL
1
KV
R
F1
OL
G
R
R
1
1
R
KV A
R
= R
KV
G
1
F
F
1
1
1
1
R
1
R
F2
1
and
R
G
F
V
1
K
1
R
R
and assume R
F
1
1
1
G
K V
K
2
1
R
R
A
1
F
G
2
V
1
1
LT1251/LT1256
1
R
2
R
F
K V A
G1
2
K
G
1
2
R
R
1
and R
2
G
F
and R
2
1
2
R
R
OL
V
F
2
2
2
K V
>> R
G2
R
R
1
G
F
R
, we get:
2
2
2
and V
2
1
2
F1
are small
K
R
R
1
(a 0.1%
13
G
F
2
2
2
drive
1