LT1251CS#PBF

Video Amps And Modules Overview

The LT1251CS#PBF is a single-channel, 40MHz current feedback video amplifier manufactured by Analog Devices Inc. It features accurate linear gain control with ±1% typical accuracy and constant gain across temperature variations. The device operates on supply voltages ranging from ±2.5V to ±15V (or single 5V to 30V) with a low supply current of 13mA. Key electrical specifications include a high slew rate of 300V/μs, a small-signal bandwidth of 40MHz at ±15V supplies, and an output current capability of 40mA. It incorporates internal circuitry for full-scale switching to eliminate off-channel feedthrough.

Video Amps And Modules Feature Summary

• Accurate linear gain control with minimal part-to-part variation due to wafer sort trimming
• Integrated circuitry eliminates the need for precise control signals around zero and full scale
• Completely temperature compensated to maintain constant gain performance
• Low control feedthrough and low differential gain/phase errors for high-fidelity signal processing

Video Amps And Modules Applications

• Composite video gain control
• RGB and YUV video gain control
• Video faders and keyers
• Gamma correction amplifiers
• Audio gain control and faders

Video Amps And Modules Procurement Notes

Verify the specific suffix CS indicates the plastic SOIC package variant when sourcing replacements. Confirm that the #PBF designation ensures compliance with RoHS directives. Check manufacturer documentation for any industrial or military grade availability if extended temperature ranges beyond commercial specifications are required for the application environment.

Video Amps And Modules Selection Notes

Select this component for applications requiring electronically controlled variable gain amplification in video systems. The LT1251 is preferred over the LT1256 when off-channel isolation is critical, as it includes internal switching logic. Ensure the design accommodates the specified input common mode range relative to the chosen supply voltage. Consider the impact of feedback resistor selection on bandwidth stability and noise performance.

Video Amps And Modules Part Context

This component belongs to the LT1251/LT1256 series of 2-input, 1-output current feedback amplifiers designed for video signal processing. It shares the same core architecture as the LT1256 but differs in its control circuit implementation. The series is optimized for broadcast-quality video systems where linearity and speed are paramount. It is distinct from general-purpose operational amplifiers due to its specialized gain control interface.

Video Amps And Modules Replacement Considerations

LT1256CN#PBF

Video Amps And Modules FAQ

What is the primary difference between the LT1251 and LT1256?

The LT1251 includes internal circuitry that forces one input completely off and the other fully on at extreme control voltages (less than 2% or greater than 98%), eliminating off-channel feedthrough. The LT1256 operates linearly over the entire control range without this switching feature.

How does the LT1251 handle control signals near zero or full scale?

For control signals less than 2% or greater than 98%, the LT1251 sets one input completely off and the other completely on. This prevents errors caused by offset or gain inaccuracies in the control signals, which is ideal for fader applications.