LT1256CS#PBF

Video Amps And Modules Overview

The LT1256CS#PBF is a single-channel, 40MHz current feedback video amplifier manufactured by Analog Devices Inc. in a 14-lead plastic SO package. It features a linear control circuit for accurate gain adjustment with ±3% maximum accuracy and constant gain across temperature variations. The device operates on supply voltages ranging from ±2.5V to ±15V, drawing a typical supply current of 13mA. Key electrical specifications include a high slew rate of 300V/μs, low output noise density of 45nV/√Hz at unity gain, and an output current capability of 40mA.

Video Amps And Modules Feature Summary

• Provides accurate linear gain control with minimal variation over temperature changes
• Features a wide bandwidth and high slew rate suitable for fast signal processing
• Includes a fast control path with low feedthrough characteristics
• Capable of delivering high output current for driving demanding loads

Video Amps And Modules Applications

• Composite video gain control circuits
• RGB and YUV video gain control systems
• Video faders and keyers
• Gamma correction amplifiers
• Audio gain control and fader applications

Video Amps And Modules Procurement Notes

Verify the specific suffix CS indicates the commercial grade plastic SO package variant. Confirm the operating temperature range aligns with system requirements, as this part is specified for 0°C to 70°C testing but operates from -40°C to 85°C. Ensure the ordering code matches the exact pinout and thermal characteristics required for the PCB layout.

Video Amps And Modules Selection Notes

Select the LT1256 when a fully linear control range exceeding 20dB is required without the hard off/on switching feature found in the LT1251. Consider the 40MHz bandwidth and 300V/μs slew rate for high-frequency video signals. Evaluate the need for external feedback resistors to set the desired bandwidth and gain stability according to the application's impedance constraints.

Video Amps And Modules Part Context

This component belongs to the LT1251/LT1256 family of 2-input, 1-output current feedback amplifiers designed for video applications. While sharing core architecture with the LT1251, the LT1256 lacks the internal circuitry that forces inputs completely off or on at the extremes of the control voltage. This distinction makes it suitable for applications requiring continuous linear gain modulation rather than discrete channel switching.

Video Amps And Modules Replacement Considerations

LT1251CN

Video Amps And Modules FAQ

How does the LT1256 differ from the LT1251 regarding control linearity?

The LT1256 operates linearly over the complete control range, whereas the LT1251 includes internal circuitry that sets one input completely off and the other completely on at control signals less than 2% or greater than 98%.

What is the recommended supply voltage range for this amplifier?

The device operates on supplies ranging from ±2.5V (or single 5V) to ±15V (or single 30V).