LT6402CUD-20#PBF

Overview

The LT6402CUD-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 with a typical current consumption of 30mA. The device includes both unfiltered outputs (+OUT, –OUT) and built-in filtered outputs (+OUTFILTERED, –OUTFILTERED) with a 75MHz -3dB bandwidth. It accepts differential or single-ended inputs and provides adjustable output common mode voltage via the VOCM pin. Packaged in a compact 16-lead 3mm × 3mm QFN.

Feature Summary

• Integrated 75MHz differential low-pass filter on dedicated filtered outputs to reduce external filtering components.
• Adjustable output common mode voltage eliminates the need for output transformers or AC-coupling capacitors.
• Supports both single-ended and differential input configurations with minimal support circuitry requirements.
• Low input-referred noise and high linearity optimized for driving high-speed 12-bit and 14-bit ADCs.

Applications

• Differential ADC driver for imaging and communications systems
• IF sampling receivers
• SAW filter interfacing and buffering
• Single-ended to differential conversion
• Level shifting

Procurement Notes

Verify the specific temperature grade suffix when ordering. The 'C' designation indicates guaranteed performance from 0°C to 70°C, while the 'I' variant covers -40°C to 85°C. Confirm that the #PBF suffix is required for lead-free compliance. Ensure the package type matches the 16-lead QFN footprint. Check datasheet notes regarding functional guarantees at extreme temperatures for the C-grade part.

Selection Notes

Select this component when a fixed 20dB gain is required for signal conditioning before an ADC. The built-in filtering simplifies designs targeting frequencies up to 75MHz. Consider the C-grade version for standard commercial temperature ranges. Verify that the 5V supply constraint aligns with the system power architecture. Evaluate the filtered versus unfiltered output pins based on the required anti-aliasing specifications.

Part Context

This part belongs to the LT6402 family of differential amplifiers. The '-20' suffix denotes the fixed 20dB gain configuration. Other variants in the series offer different gain settings. The device is manufactured by Analog Devices Inc. and utilizes a closed-loop topology with three internal amplifiers to achieve its performance characteristics.

Replacement Considerations

LT6402IUD-20#PBF: Offers extended operating temperature range (-40°C to 85°C).