LTC6401CUD-20#TRPBF

Overview

The LTC6401CUD-20#TRPBF is a high-speed differential amplifier designed for processing signals from DC to 140MHz. It features a fixed gain of 20dB (10V/V) and a 1.3GHz -3dB bandwidth. The device operates on a single supply voltage ranging from 2.85V to 3.5V with a typical supply current of 50mA. Key electrical specifications include an input noise density of 2.1nV/√Hz, a noise figure of 6.2dB at 10MHz, and a third-order intermodulation distortion of -93dBc at 70MHz. It provides differential inputs and outputs within a compact 16-lead 3mm × 3mm QFN package.

Feature Summary

• Differential ADC Driver optimized for low noise and low distortion performance in signal processing applications.
• Fixed internal gain of 20dB eliminates the need for external feedback components, simplifying circuit design.
• Adjustable output common mode voltage allows direct interfacing with analog-to-digital converters without transformers or AC-coupling capacitors.
• Integrated filtered outputs provide additional low-pass filtering capabilities for wideband applications.

Applications

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

Procurement Notes

Verify the specific suffix #TRPBF indicates tape and reel packaging when sourcing. Confirm the 'C' grade designation corresponds to the commercial temperature range of 0°C to 70°C rather than the industrial range. Ensure compatibility with the 16-lead QFN footprint during procurement planning.

Selection Notes

Select this component for applications requiring a fixed 20dB gain with minimal external support circuitry. Consider the commercial temperature range if operating conditions exceed 70°C. Evaluate the 2.85V to 3.5V supply requirement against system power constraints. Compare noise figures and distortion metrics against alternative drivers for specific frequency bands.

Part Context

This part belongs to the LTC6401 family of high-speed differential amplifiers. It shares pinout compatibility with other gain variants like the LTC6401-26 but offers a distinct fixed gain setting. The device is manufactured by Analog Devices Inc. and utilizes a silicon germanium process technology to achieve high speed and low noise characteristics.

Replacement Considerations

The LTC6401IUD-20#TRPBF serves as a direct replacement with an extended industrial temperature range (-40°C to 85°C). The LTC6400-20 is pin-compatible but offers lower distortion at the cost of higher power consumption. Verify temperature ratings and power dissipation requirements before substituting.

FAQ

["What is the fixed gain of the LTC6401CUD-20?","The device has a fixed internal gain of 20dB, which corresponds to a voltage gain of 10V/V."]

["How is the output common mode voltage controlled?","The output common mode voltage is set externally via the VOCM pin, allowing adjustment between 1V and 1.6V to match ADC requirements."]

["What is the input impedance of the amplifier?","The differential input impedance is specified as 200Ω."]