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LT1256

Linear Technology
Part Number LT1256
Manufacturer Linear Technology
Description 40MHz Video Fader and DC Gain Controlled Amplifier
Published Mar 22, 2005
Detailed Description LT1251/LT1256 40MHz Video Fader and DC Gain Controlled Amplifier FEATURES s s s s s s s s DESCRIPTION The LT ®1251/LT1...
Datasheet PDF File LT1256 PDF File

LT1256
LT1256

Overview
LT1251/LT1256 40MHz Video Fader and DC Gain Controlled Amplifier FEATURES s s s s s s s s DESCRIPTION The LT ®1251/LT1256 are 2-input, 1-output, 40MHz current feedback amplifiers with a linear control circuit that sets the amount each input contributes to the output.
These parts make excellent electronically controlled variable gain amplifiers, filters, mixers and faders.
The only external components required are the power supply bypass capacitors and the feedback resistors.
Both parts operate on supplies from ± 2.
5V (or single 5V) to ±15V (or single 30V).
Absolute gain accuracy is trimmed at wafer sort to minimize part-to-part variations.
The circuit is completely temperature compensated.
The LT1251 includes circuitry that eliminates the need for accurate control signals around zero and full scale.
For control signals of less than 2% or greater than 98%, the LT1251 sets one input completely off and the other completely on.
This is ideal for fader applications because it eliminates off-channel feedthrough due to offset or gain errors in the control signals.
The LT1256 does not have this on/off feature and operates linearly over the complete control range.
The LT1256 is recommended for applications requiring more than 20dB of linear control range.
s s s s Accurate Linear Gain Control: ± 1% Typ, ± 3% Max Constant Gain with Temperature Wide Bandwidth: 40MHz High Slew Rate: 300V/µs Fast Control Path: 10MHz Low Control Feedthrough: 2.
5mV High Output Current: 40mA Low Output Noise 45nV/√Hz at AV = 1 270nV/√Hz at AV = 100 Low Distortion: 0.
01% Wide Supply Range: ± 2.
5V to ± 15V Low Supply Current: 13mA Low Differential Gain and Phase: 0.
02%, 0.
02° U APPLICATIONS s s s s s s s Composite Video Gain Control RGB, YUV Video Gain Control Video Faders, Keyers Gamma Correction Amplifiers Audio Gain Control, Faders Multipliers, Modulators Electronically Tunable Filters , LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION Two-Input Vide...


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