Analog Devices Inc. LT5520EUF#TRPBF

Overview

LT5520EUF#TRPBF from Analog Devices (formerly Linear Technology) is a high-linearity, upconverting RF mixer IC designed for wireless infrastructure transmitters. It operates with RF output from 1300MHz to 2300MHz, delivers 15.9dBm typical input IP3 at 1.9GHz, integrates an on-chip RF output transformer, requires only a single 5V supply, and supports single-ended LO/RF operation - enabling compact, low-cost cable downlink and point-to-point radio designs.

For engineers reviewing the LT5520EUF#TRPBF datasheet, LT5520EUF#TRPBF pinout, LT5520EUF#TRPBF application, or LT5520EUF#TRPBF equivalent, key selection considerations include its 1.3–2.3GHz RF bandwidth, –41dBm typical LO-to-RF leakage, DC–400MHz IF range, integrated LO buffer requiring –5dBm drive, and enable-controlled 1µA shutdown current - all in a thermally enhanced 4mm × 4mm QFN package.

Technical Context

The LT5520EUF#TRPBF implements a double-balanced mixer core driven by a high-speed, internally matched LO buffer, enabling direct single-ended LO injection without external matching. Its RF output uses an integrated 4:1 on-die transformer to deliver 50Ω differential output impedance across 1.3–2.3GHz, eliminating discrete baluns or matching networks.

IF inputs are emitter-coupled and require external 100Ω termination to ground per side for proper biasing (~18mA/side); LO inputs feature internal 50Ω resistive matching and support both low-side and high-side injection. The enable pin controls full-power operation (70mA) or ultra-low-leakage shutdown (≤100µA).

Key Specifications

Pinout & Package

LT5520EUF#TRPBF is housed in a 16-lead, 4mm × 4mm plastic QFN package with exposed thermal pad (Pin 17), which must be soldered to PCB ground for thermal and RF performance. Pin pitch is 0.65 mm; package conforms to JEDEC MO-220 WGGC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LT5511, LT5520EUF#TRPBF trades 1.1 dB IIP3 and 200 MHz upper-frequency margin for 20 mA lower supply current and proven stability in high-volume cable and LTE infrastructure - making it the preferred choice where thermal density and bill-of-materials simplicity are prioritized over maximum frequency reach.

Availability

LT5520EUF#TRPBF is available at Aetrix Electronics and suitable for wireless infrastructure transmitters, cable downlink nodes, point-to-point microwave radios, and high-linearity test equipment requiring stable component supply across extended product lifecycles.

Supply support for LT5520EUF#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 acquired Linear Technology in 2017 and maintains full technical and manufacturing continuity for legacy Linear RF products. Linear was founded in 1981 and specialized in high-performance analog ICs for demanding signal-chain applications.

The LT5520EUF#TRPBF belongs to Linear's high-linearity RF mixer product line, engineered specifically for wireless infrastructure transmitters requiring robust intermodulation performance, integrated matching, and simplified system-level design - targeting macrocell, small-cell, and broadband access equipment.

FAQ

What is the RF output frequency range supported by the LT5520EUF#TRPBF?

The LT5520EUF#TRPBF supports an RF output frequency range of 1300 MHz to 2300 MHz. This covers key cellular bands including LTE Bands 1 (1920–1980 MHz), 2 (1850–1910 MHz), 3 (1710–1785 MHz), 25 (1850–1915 MHz), and 38 (2570–2620 MHz), as well as AWS and PCS infrastructure applications. Performance is characterized and guaranteed across this full band per the datasheet's electrical specifications table.

Does the LT5520EUF#TRPBF require external matching components at the RF output?

No, the LT5520EUF#TRPBF does not require external matching components at the RF output. It integrates a monolithic 4:1 RF output transformer that provides a 50Ω differential impedance match across its entire 1300–2300 MHz RF output band. This eliminates the need for external baluns, transformers, or matching networks - reducing component count, PCB area, and system-level variations while maintaining consistent performance.

What is the typical input IP3 of the LT5520EUF#TRPBF and at what condition is it measured?

The LT5520EUF#TRPBF delivers a typical input third-order intercept point (IIP3) of 15.9 dBm at 1.9 GHz. This value is measured under standard conditions: VCC = 5 VDC, EN = high, TA = 25°C, IF input = 140 MHz at –10 dBm (two-tone), LO input = 1.76 GHz at –5 dBm, and RF output measured at 1900 MHz. The specification is confirmed in the "ELECTRICAL CHARACTERISTICS" table on page 2 of the official datasheet.

Can the LT5520EUF#TRPBF operate with a single-ended LO source?

Yes, the LT5520EUF#TRPBF is explicitly designed for single-ended LO operation. The LO+ and LO– pins feature an internal 50Ω resistive match, allowing the LO+ pin to be driven directly by a single-ended source while LO– is connected to a low-impedance RF ground. No external matching network is required, and this configuration is validated in the typical application circuits and test schematics provided in the datasheet.

What is the recommended thermal management for the LT5520EUF#TRPBF?

The LT5520EUF#TRPBF uses a 4mm × 4mm QFN package with an exposed thermal pad (Pin 17) that must be soldered to a low-thermal-resistance PCB ground plane. The datasheet specifies θJA = 37°C/W, achievable only when the exposed pad is fully connected to ≥2 cm² of internal/external copper ground. Inadequate pad soldering increases junction temperature, degrading linearity (IIP3), gain stability, and long-term reliability - especially in continuous-wave infrastructure applications.