LTC6400CUD-26#PBF

Overview

The LTC6400CUD-26#PBF is a high-speed differential amplifier designed for processing DC to 300MHz signals. It features a fixed gain of 26dB (20V/V) and a 1.9GHz -3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V, drawing 85mA of supply current. It provides differential inputs with 50Ω impedance and adjustable output common mode voltage between 1V and 1.6V via the VOCM pin. Packaged in a compact 16-lead 3mm x 3mm QFN, it is specified for commercial temperature ranges.

Feature Summary

• Provides low noise and low distortion performance specifically optimized for driving 12-, 14-, and 16-bit ADCs.
• Features an externally adjustable output common mode voltage independent of input signals, eliminating the need for transformers or AC-coupling capacitors.
• Integrates internal feedback networks setting a fixed gain of 20V/V and offers filtered outputs for simplified low-pass or band-pass filtering implementation.

Applications

• Differential ADC Driver
• Single Ended to Differential Conversion
• IF Sampling Receivers
• SAW Filter Interfacing

Procurement Notes

Verify the 'C' suffix indicates the commercial temperature grade (0°C to 70°C), distinct from the industrial 'I' variant (-40°C to 85°C). Confirm the '#PBF' designation corresponds to lead-free finish and tube packaging. Ensure the specific part number matches the required gain version, as other variants exist within the family.

Selection Notes

Select this component when a fixed 26dB gain is required for broadband signal conditioning up to 300MHz. Consider the 50Ω differential input impedance for direct source matching. Evaluate the power consumption against alternatives if lower current draw is critical, noting the existence of the LTC6401 family for reduced power applications.

Part Context

This device belongs to the LTC6400 series of fully differential amplifiers. It shares pin compatibility with the LTC6401 family but offers higher output drive capability at the cost of increased power consumption. The specific '-26' designation denotes the fixed 26dB gain configuration, distinguishing it from other gain options like the 20dB or 8dB variants available in the broader product line.

Replacement Considerations

LTC6400IUD-26#PBF: Identical electrical specifications but guaranteed over the extended industrial temperature range of –40°C to 85°C.

FAQ

How is the output common mode voltage controlled?

The output common mode voltage is set by the external VOCM pin, which allows adjustment between 1V and 1.6V independently of the input signals.

What is the differential input impedance?

The LTC6400-26 features a differential input impedance of 50Ω, facilitating straightforward interfacing with standard 50Ω sources.