LTC6400IUD-8#PBF

Overview

The LTC6400IUD-8#PBF is a high-speed differential amplifier designed for processing signals from DC to 300MHz. It features a fixed gain of 2.5V/V (8dB) and a 2.2GHz –3dB bandwidth. The device operates on a supply voltage between 2.85V and 3.5V with a typical current of 85mA. Key electrical parameters include a 400Ω differential input impedance, 1nV/√Hz internal op amp noise, and a 7.6dB noise figure. It provides a maximum differential output swing of 4.8V P-P and supports an adjustable output common mode voltage range of 1V to 1.6V.

Feature Summary

• Fixed gain of 2.5V/V (8dB) with low noise and distortion characteristics optimized for driving high-resolution ADCs.
• Differential inputs and outputs with independent output common mode voltage control via the VOCM pin.
• Integrated filtered outputs (+OUTF/-OUTF) featuring 50Ω series resistors and 2.7pF shunt capacitors for simplified filtering.
• Compact 16-lead 3mm × 3mm QFN package with exposed pad soldered to PCB for thermal management.

Applications

• Differential ADC Driver
• IF Sampling Receivers
• SAW Filter Interfacing

Procurement Notes

Verify the specific suffix '#PBF' indicates lead-free finish and tube packaging when ordering. Confirm the 'I' grade designation matches the required -40°C to 85°C operating temperature range. Ensure the QFN-16 package dimensions align with the target PCB footprint. Cross-reference the manufacturer's latest documentation for any discontinuance notifications or alternate part recommendations.

Selection Notes

Select this component for applications requiring a fixed 8dB gain and wideband performance up to 300MHz. Compare against the LTC6401 family if lower power consumption is prioritized over linearity at higher frequencies. Consider the 400Ω input impedance for direct matching requirements or external termination networks. Evaluate the 85mA supply current against system power budgets compared to alternative drivers.

Part Context

This part belongs to the LTC6400 family of high-speed differential amplifiers. It is distinct from the LTC6401 series, which offers lower power consumption but slightly higher non-linearity above 140MHz. The IUD-8 variant specifically denotes the industrial temperature grade (-40°C to 85°C) and the 8dB gain configuration within the 16-lead QFN package.

Replacement Considerations

LTC6400CUD-8#PBF is available as a commercial grade alternative (0°C to 70°C). For lower power applications, the LTC6401IUD-8#PBF is pin-compatible but exhibits different linearity characteristics at high frequencies.