LTC6401IUD-8#TRPBF

Overview

The Analog Devices LTC6401IUD-8#TRPBF is a high-speed differential amplifier designed for processing signals from DC to 140MHz. It features a fixed gain of 2.5V/V (8dB) and a 2.2GHz –3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V with a typical supply current of 45mA. It provides differential inputs and outputs, an adjustable output common mode voltage between 1V and 1.6V, and a maximum differential output swing of 4.6V P-P. Packaged in a compact 16-lead 3mm × 3mm QFN, it supports operation from –40°C to 85°C.

Feature Summary

• Differential ADC driver optimized for low noise and low distortion performance across wideband frequencies.
• Internally fixed gain configuration eliminates external feedback components for simplified circuit design.
• Adjustable output common mode voltage control allows direct interfacing with various ADC input ranges without transformers.

Applications

• Differential ADC driver for 12-, 14-, and 16-bit analog-to-digital converters
• Differential driver and receiver circuits
• Single-ended to differential signal conversion
• IF sampling receivers
• SAW filter interfacing

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing this component. Confirm the 'I' grade designation matches the required industrial temperature range of –40°C to 85°C for your application environment. Ensure the ordering information aligns with the manufacturer's current production status and lead time requirements.

Selection Notes

Select this part when a fixed 8dB gain is sufficient for the system architecture. Consider the 400Ω differential input impedance for source matching requirements. Evaluate the 1nV/√Hz internal op amp noise density against the system noise floor. Verify that the 2.85V to 3.5V supply range fits within the available power rails.

Part Context

This component belongs to the LTC6401 family of high-speed differential amplifiers. It shares pin compatibility and similar architectural features with other variants like the LTC6401-14 and LTC6401-26, which offer different fixed gain settings. The family is targeted at driving high-resolution ADCs while maintaining low distortion characteristics.

Replacement Considerations

The LTC6401CUD-8#TRPBF serves as a commercial grade alternative with a 0°C to 70°C operating range. For higher gain requirements within the same package, consider the LTC6401-14 or LTC6401-26. The LTC6400 series offers pin-compatible options with lower distortion but higher supply current consumption.

FAQ

How is the output common mode voltage controlled?

The output common mode voltage is set by the VOCM pin, which accepts an external bias voltage. This voltage can be adjusted between 1V and 1.6V to match the input requirements of the connected ADC.

What is the differential input impedance of the LTC6401-8?

The differential input impedance is specified as 400Ω. External termination resistors may be required to match lower source impedances such as 50Ω.