LTC6400IUD-14#PBF

Overview

The LTC6400IUD-14#PBF is a high-speed differential amplifier designed for processing signals from DC to 300MHz. It features a fixed gain of 5V/V (14dB) and a 2.4GHz –3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V, drawing 85mA of supply current. It provides an adjustable output common mode voltage between 1V and 1.6V via the VOCM pin. Key performance metrics include a total input noise density of 2.5nV/√Hz and a typical noise figure of 7.5dB at 10MHz.

Feature Summary

• Provides low noise and low distortion performance suitable for driving 12-, 14-, and 16-bit ADCs.
• Features an internally fixed gain of 14dB with minimal support circuitry requirements.
• Includes an external VOCM pin for independent output common mode voltage control.
• Offers both unfiltered and filtered differential outputs within a compact QFN package.

Applications

• Differential ADC Driver
• Single Ended to Differential Conversion
• IF Sampling Receivers

Procurement Notes

Verify the specific suffix 'IUD' indicates the industrial temperature range (-40°C to 85°C). Confirm the '#PBF' designation corresponds to lead-free finish and tube packaging. Ensure the component matches the 16-lead 3mm x 3mm QFN physical dimensions. Cross-reference the manufacturer's latest discontinuance notifications or lifecycle status before finalizing procurement plans.

Selection Notes

Select this part when a fixed 14dB gain is required for broadband signal conditioning up to 300MHz. Consider the 200Ω differential input impedance for source matching requirements. Evaluate the 85mA supply current against power constraints compared to the lower-power LTC6401 family if linearity at higher frequencies is not critical. Verify that the 2.85V to 3.5V supply range aligns with the system power architecture.

Part Context

This component belongs to the LTC6400 family of high-speed differential amplifiers manufactured by Analog Devices Inc. The family includes variants with different fixed gains (8dB, 20dB, 26dB) and a lower-power counterpart series, the LTC6401. The IUD-14 variant specifically denotes the industrial temperature grade and 14dB gain configuration within the 16-lead QFN package lineup.

Replacement Considerations

LTC6400CUD-14#PBF: Commercial temperature grade version.

FAQ

How is the output common mode voltage controlled?

The output common mode voltage is set independently of the inputs using the external VOCM pin, allowing operation without transformers or AC-coupling capacitors in many applications.

What is the purpose of the +OUTF and -OUTF pins?

These pins provide filtered differential outputs featuring an internal 50Ω series resistor and 2.7pF shunt capacitor, creating a low-pass filter with a -3dB bandwidth of approximately 590MHz.