LT6402IUD-20#PBF

Overview

The LT6402IUD-20#PBF is a low distortion, low noise differential amplifier and ADC driver designed for applications from DC to 300MHz. It features a fixed gain of 20dB (10V/V) and operates on a single 5V supply consuming 30mA. The device includes unfiltered outputs (+OUT, –OUT) and an integrated 75MHz differential low-pass filter with filtered outputs (+OUTFILTERED, –OUTFILTERED). It provides adjustable output common mode voltage via the VOCM pin, eliminating the need for external transformers or AC-coupling capacitors in many configurations.

Feature Summary

• Integrated 75MHz differential low-pass filter providing additional filtered outputs to reduce external component count
• Adjustable output common mode voltage allowing direct interfacing with high-speed ADCs without transformers
• Low input-referred noise and low distortion characteristics suitable for driving 12-bit and 14-bit ADCs
• Supports both DC-coupled and AC-coupled operation with minimal required support circuitry

Applications

• Differential ADC driver for imaging and communications systems
• IF sampling receivers and SAW filter interfacing/buffering
• Single-ended to differential conversion and level shifting
• General-purpose differential gain block requiring minimal support components

Procurement Notes

Verify the 'I' suffix indicates the industrial temperature range (-40°C to 85°C) as specified in the datasheet. Confirm the '#PBF' designation ensures lead-free compliance. Ensure the UD package marking matches the 16-lead QFN physical dimensions. Cross-reference the specific part number against the manufacturer's current ordering guide to confirm availability status and any potential obsolescence notices before finalizing procurement.

Selection Notes

Select this component when a fixed 20dB gain is required alongside integrated filtering capabilities. The built-in 75MHz low-pass filter simplifies anti-aliasing requirements for high-speed data acquisition systems. Consider the adjustable VOCM pin for flexible interface compatibility with various ADC common mode voltages. The device is optimized for 5V single-supply operation, making it suitable for systems where dual supplies are unavailable or undesirable.

Part Context

This part belongs to the LT6402 family of differential amplifiers, which offers variants with different fixed gains such as -1, -2, and -4. The LT6402-20 specifically targets applications needing 20dB gain. The 'I' grade denotes industrial temperature performance, while the 'UD' package refers to the compact 3mm x 3mm QFN form factor. This family is engineered to minimize external support components compared to traditional discrete solutions.

Replacement Considerations

LT6402CUD-20#PBF: Identical electrical specifications but rated for commercial temperature range (0°C to 70°C).