LT1251
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LT1251

40MHz Video Fader and DC Gain Controlled Amplifier

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LTspice LT1251 - Operational Amplifiers (Op Amps) Download 1.94 KB
Part Models 3
1ku List Price Starting From $8.64
Features
  • 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°
Additional Details
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The LT1251/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.

Applications

  • Composite Video Gain Control
  • RGB, YUV Video Gain Control
  • Video Faders, Keyers
  • Gamma Correction Amplifiers
  • Audio Gain Control, Faders
  • Multipliers, Modulators
  • Electronically Tunable Filters
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Documentation View All Documentation
LTspice LT1251 - Operational Amplifiers (Op Amps) Download 1.94 KB
Part Models 3
1ku List Price Starting From $8.64
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LT1251

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Data Sheet

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UPDATED 10/02/2017
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LT1251/LT1256: 40MHz Video Fader and DC Gain Controlled Amplifier Data Sheet

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Application Note

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UPDATED 08/20/2007
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AN67 - Linear Technology Magazine Circuit Collection, Volume III redirect icon

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Reliability Data

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UPDATED 03/23/2018
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R164 Reliability Data redirect icon

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Documentation

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LT1251CN#PBF 14-Lead PDIP (Narrow 0.3 Inch) external-link
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LT1251CS#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LT1251CS#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

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Qualification Results Summary

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Oct 8, 2024

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Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package

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Marking Comparison

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Oct 12, 2022

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Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LT1251CS#PBF

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LT1251CS#TRPBF

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PCN22_0251_Form

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xls

Material_Report

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pdf

Qualification Results Summary

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Aug 6, 2022

- 22_0173

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1251CS#PBF

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LT1251CS#TRPBF

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pdf

PCN22_0173_Form

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Delta Qualification Matrix

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PCN

Oct 11, 2022

- 22_0241

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LT1251CN#PBF

PRODUCTION

pdf

PCN22_0241_Form

external-icon

xls

Material_Report

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pdf

Qualification Results Summary

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Aug 6, 2022

- 22_0172

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Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

LT1251CN#PBF

PRODUCTION

pdf

PCN22_0172_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

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Oct 8, 2024

- 24_0236

arrow down

Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package

LT1251CS#PBF

PRODUCTION

LT1251CS#TRPBF

PRODUCTION

pdf

PCN24_0236_Form

external-icon

xls

Material_Report

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pdf

Marking Comparison

external-icon

xlsm

Delta Qualification Matrix

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Oct 12, 2022

- 22_0251

arrow down

Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LT1251CS#PBF

PRODUCTION

LT1251CS#TRPBF

PRODUCTION

pdf

PCN22_0251_Form

external-icon

xls

Material_Report

Download

pdf

Qualification Results Summary

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Aug 6, 2022

- 22_0173

arrow down

Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LT1251CS#PBF

PRODUCTION

LT1251CS#TRPBF

PRODUCTION

pdf

PCN22_0173_Form

external-icon

xls

Material_Report

Download

xlsm

Delta Qualification Matrix

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Software & Part Ecosystem

Tools & Simulations 1

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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LT1251 - Operational Amplifiers (Op Amps) Download

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