LTC6430BIUF-20#PBF

Overview

The LTC6430BIUF-20#PBF is a high linearity differential RF/IF amplifier and ADC driver manufactured by Analog Devices Inc. It operates from a single 5V supply, consuming 850mW of DC power. The device features a 20.8dB gain and a -3dB bandwidth extending from 20MHz to 2060MHz. Key performance metrics include a noise figure of 2.9dB at 240MHz, an output third-order intercept point (OIP3) of 47.9dBm at 240MHz, and a P1dB of 24.0dBm. It utilizes a SiGe BiCMOS process and is housed in a 4mm x 4mm, 24-lead QFN package.

Feature Summary

• High linearity differential architecture designed for driving high-resolution, high-speed ADCs with excellent linearity beyond 1000MHz.
• Internally matched to 100Ω differential source and load impedance with on-chip bias and temperature compensation.
• Capable of functioning as a 50Ω wideband balanced amplifier or a 75Ω CATV amplifier using appropriate baluns.
• Utilizes a high-performance SiGe BiCMOS process for repeatability and includes an exposed pad for thermal management.

Applications

• Differential ADC Driver
• Differential IF Amplifier
• OFDM Signal Chain Amplifier
• 50Ω Balanced IF Amplifier
• 75Ω CATV Amplifier

Procurement Notes

Verify the specific B-grade designation, which indicates that OIP3 testing at 380MHz is not guaranteed compared to A-grade variants. Confirm the package type is the 24-lead QFN with an exposed ground pad. Ensure the operating temperature range meets the requirement of -40°C to +85°C. Check current availability status as distribution may be limited.

Selection Notes

Select this component for applications requiring fixed-gain amplification with high linearity across a wide frequency range up to 2GHz. It is suitable for systems needing direct drive to differential ADC inputs without external matching networks. Consider the B-grade specification if strict OIP3 guarantees at higher frequencies are not required for the design.

Part Context

This part belongs to the LTC6430-YY series of differential gain block amplifiers. The '20' suffix denotes the specific gain and bandwidth characteristics of this variant. It is related to the single-ended LTC6431-20. The B-grade suffix distinguishes it from the A-grade version regarding factory testing guarantees.

Replacement Considerations

LTC6430AIUF-20#PBF

FAQ

What is the difference between the A-grade and B-grade versions of the LTC6430-20?

The A-grade devices are tested and guaranteed for OIP3 at 380MHz, whereas the B-grade does not have this specific guarantee.

How is the device internally biased?

The input pins (+IN and -IN) have an internally generated 1.8V DC bias, requiring DC-blocking capacitors for AC coupling.