Analog Devices Inc. LT5525EUF#TRPBF

Overview

LT5525EUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-linearity, low-power broadband downconverting mixer IC optimized for RF receiver front-ends in wireless infrastructure and point-to-point radios. It operates with RF input from 800MHz to 2500MHz, delivers +17.6dBm IIP3 at 1900MHz, –1.9dB conversion gain, 15.1dB SSB noise figure, and draws only 28mA from a single 5V supply.

For engineers reviewing the LT5525EUF#TRPBF datasheet, LT5525EUF#TRPBF pinout, LT5525EUF#TRPBF application, or LT5525EUF#TRPBF equivalent, key selection criteria include its integrated LO buffer requiring only –5dBm drive, differential RF/LO/IF ports with internal 50Ω matching, enable-controlled shutdown (100µA), and QFN-16 (4mm × 4mm) package with exposed thermal pad.

Technical Context

The LT5525EUF#TRPBF integrates a double-balanced active mixer core, on-die RF balun, RF buffer amplifier, and high-speed limiting LO buffer - enabling high isolation (LO-RF >38dB, LO-IF ≤–39dBm) and robust linearity without external matching for standard 50Ω sources. Its architecture supports both low-side and high-side LO injection across 500MHz–3GHz.

It uses differential signaling at all ports (RF+, RF–; LO+, LO–; IF+, IF–), with internal DC blocking and transformer-coupled RF inputs. The enable pin (EN) controls power to LO buffer (Pin 6), bias circuits (Pin 7), and mixer core, achieving full turn-off in 6µs with <100µA shutdown current.

Key Specifications

Pinout & Package

LT5525EUF#TRPBF is housed in a 16-lead plastic QFN (4mm × 4mm) package with exposed thermal pad (Pin 17), compliant with JEDEC MO-220 WGGC. The exposed pad must be soldered to PCB ground for thermal and RF performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar downconverting mixer applications.

Compared with LT5522 and LT5526, the LT5525EUF#TRPBF offers the best balance of mid-band linearity (+17.6 dBm IIP3), compact footprint, and low 28 mA supply current - making it the preferred choice for cost-sensitive, thermally constrained 1900/2100 MHz wireless infrastructure receivers.

Availability

LT5525EUF#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure, point-to-point microwave radios, and high-performance tactical radios requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for LT5525EUF#TRPBF includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and RF ICs, serving communications, industrial, automotive, and aerospace markets.

The LT5525EUF#TRPBF belongs to Linear's high-linearity RF mixer product line, designed specifically for demanding downconversion applications in wireless infrastructure and professional radio systems where IIP3, noise figure, and power efficiency are critical.

FAQ

What is the recommended LO drive level for LT5525EUF#TRPBF?

The LT5525EUF#TRPBF is characterized and optimized for –5 dBm differential LO input power. It supports LO drive from –10 dBm to 0 dBm, but deviation beyond –5 dBm degrades IIP3 and conversion gain flatness. The integrated LO buffer eliminates need for external amplification, simplifying LO chain design while maintaining consistent performance across temperature.

Does LT5525EUF#TRPBF require external RF matching components?

LT5525EUF#TRPBF achieves >15 dB RF input return loss from 1300 MHz to 2300 MHz with no external matching. For operation below 1300 MHz (e.g., 900 MHz band), a series 3.9 pF capacitor at the RF input improves match; above 2300 MHz, a 1.2 nH series inductor extends coverage to 2500 MHz. These are optional - not mandatory - for basic functionality.

How is the IF output of LT5525EUF#TRPBF interfaced to a single-ended ADC input?

The LT5525EUF#TRPBF provides differential IF+ and IF– outputs requiring external combination. A 4:1 IF transformer (e.g., M/A-COM ETC4-1-2) or lumped-element bridge balun (Figure 11) converts to single-ended 50 Ω. The output is modeled as 574 Ω || 0.7 pF, and biasing to V_CC via chokes or center-tap is mandatory. No internal termination is provided.

What is the thermal management requirement for LT5525EUF#TRPBF?

LT5525EUF#TRPBF has θ_JA = 37°C/W and T_JMAX = 125°C. With 28 mA at 5 V (140 mW dissipation), junction temperature rise is ~5.2°C above ambient under ideal PCB conduction. The exposed pad (Pin 17) must be soldered to a solid copper ground plane; thermal vias under the pad are strongly recommended to ensure reliable operation at 85°C ambient.

Can LT5525EUF#TRPBF operate with high-side LO injection?

Yes, LT5525EUF#TRPBF supports both high-side and low-side LO injection. Performance data (Figures G01, G02, F13, F14) explicitly includes high-side LO curves. At f_RF = 1900 MHz, high-side LO (f_LO = 2040 MHz → f_IF = 140 MHz) delivers comparable IIP3 and conversion gain to low-side mode, with identical noise figure and isolation specs.