LTC6420CUDC-20#TRPBF

Overview

The LTC6420CUDC-20#TRPBF is a dual high-speed differential amplifier designed for processing signals from DC to 300MHz. It features a fixed gain of 20dB (10V/V) and a 1.8GHz -3dB bandwidth. The device operates on a supply voltage range of 2.85V to 3.5V with a typical supply current of 80mA per amplifier. Key electrical parameters include an input offset voltage of ±0.4mV, a slew rate of 4500V/µs, and a noise figure of 6.2dB at 100MHz. It utilizes a 20-lead 3mm × 4mm QFN package.

Feature Summary

• Dual matched amplifiers with channel-to-channel gain matching of ±0.1dB and phase matching of ±0.1° at 100MHz.
• Internal output common mode voltage control allows direct ADC interfacing without external transformers or AC-coupling capacitors.
• Rail-to-rail output swing capability supports maximum dynamic range in low-voltage applications.
• Differential inputs and outputs provide superior noise rejection and signal integrity.

Applications

• Differential ADC driver
• Single-ended to differential conversion
• IF sampling receivers
• Broadband I/Q amplifiers

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 required 20-lead QFN footprint during procurement planning.

Selection Notes

Select this component for applications requiring precise gain and phase matching between two channels. The internal common mode biasing simplifies design by removing the need for external coupling components. Consider the 200Ω differential input impedance for source matching requirements.

Part Context

This part belongs to the LTC6420-20 family of dual matched differential amplifiers. It shares architectural similarities with single-channel variants like the LTC6400-20 but provides integrated dual-channel performance. The device targets high-frequency signal processing where low distortion and minimal support circuitry are critical.

Replacement Considerations

LTC6420IUDC-20#TRPBF serves as a functional replacement offering the same specifications over the extended –40°C to 85°C temperature range.

FAQ

How is the output common mode voltage controlled?

The output common mode voltage is set independently via the VOCM pin, allowing adjustment within a range of 1.1V to 1.6V without affecting the differential signal path.

What is the channel separation performance?

The device provides 80dB of channel separation at 100MHz, ensuring minimal crosstalk between the two internal amplifiers.