Analog Devices Inc. DC1984A

Overview

LTC5510 from Analog Devices (formerly Linear Technology) is a high-linearity, wideband active mixer IC optimized for RF up- and down-conversion in 30MHz–6GHz systems. It delivers 1.5dB conversion gain, 27dBm OIP3 at 1575MHz, 11.6dB noise figure, and operates from 5V or 3.3V supply with 105mA current draw - enabling use in cable infrastructure, wireless base stations, and GNSS receivers.

For engineers reviewing the LTC5510 datasheet, LTC5510 pinout, LTC5510 application, or LTC5510 equivalent, this page provides verified technical context, package mapping to the 4mm × 4mm QFN-16 (UF), validated pin functions including differential LO/RF/OUT interfaces and temperature monitor, and real-world performance trade-offs between 5V and 3.3V operation.

Technical Context

The LTC5510 integrates a double-balanced active mixer core, high-speed LO amplifier, and input buffer - supporting both single-ended and differential LO drive at only 0dBm. Its input is impedance-matched via external 1:1 baluns for 50Ω operation from 30MHz to >3GHz, while internal biasing enables stable performance across –40°C to 105°C.

It features integrated shutdown control (EN pin), on-chip temperature monitoring (TEMP pin), and adjustable bias current via IADJ pin. LO leakage is suppressed below –50dBm across 20–3300MHz, reducing output filtering requirements; IN-LO isolation exceeds 55dB, and IN-OUT isolation remains >40dB up to 1150MHz.

Key Specifications

Pinout & Package

Package: 16-lead (4mm × 4mm) plastic QFN (UF) with exposed GND pad (Pin 17), rated for –40°C to 105°C operation. Exposed pad must be soldered to PCB ground plane for thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HMC1040LP3E and MAX2031, the LTC5510 uniquely balances ultra-low LO drive (0dBm), integrated thermal sensing, and shutdown control - making it optimal for thermally constrained, battery-aware, or LO-limited wideband receiver designs where moderate NF and high OIP3 must coexist.

Availability

LTC5510 is available at Aetrix Electronics and suitable for cable infrastructure, wireless base station development, and GNSS receiver design requiring stable component supply, full temperature-grade availability (–40°C to 105°C), and long-term production support.

Supply support for LTC5510 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 its high-performance RF product lines with rigorous qualification and long-term support.

The LTC5510 belongs to Linear's precision RF mixer family, designed specifically for wideband communications infrastructure demanding high linearity, low noise, and flexible power operation across commercial and industrial temperature ranges.

FAQ

What is the minimum LO drive level required for optimal performance of the LTC5510?

The LTC5510 achieves best distortion and noise performance with only 0dBm LO drive across 1MHz–5GHz. Driving below –3dBm degrades OIP3 by up to 4dB and increases noise figure; above +3dBm yields diminishing returns and risks exceeding absolute maximum ratings. The LTC5510 datasheet specifies 0dBm as the recommended nominal LO power for all key AC specs.

Can the LTC5510 operate from a 3.3V supply, and how does performance change?

Yes, the LTC5510 operates from 3.3V with slightly reduced performance: conversion gain remains ~1.4dB, OIP3 drops to 23–24dBm, NF increases to ~11.4dB, and input P1dB falls to 8.9–10.7dBm. Total supply current decreases to ~94mA. These values are fully characterized in the datasheet's 3.3V application sections and remain suitable for portable or mixed-voltage RF systems.

How is the TEMP pin used for die temperature measurement in the LTC5510?

The TEMP pin connects to an on-die diode anode via a 30Ω resistor. Applying a constant 10µA current yields a voltage drop of 697mV at 25°C, decreasing by −1.80mV/°C - enabling accurate die temperature calculation. External circuitry (e.g., ADC with current source) must provide the bias current; the LTC5510 itself does not generate it.

Does the LTC5510 require external baluns, and why?

Yes, the LTC5510's IN+, IN– inputs are optimized for differential 50Ω drive using 1:1 transmission-line baluns. This achieves >11dB input return loss from 30MHz to >3GHz. Single-ended drive is possible but degrades return loss, balance, and even-order distortion - so baluns are strongly recommended for specified wideband performance.

What is the purpose of the IADJ pin on the LTC5510, and how is it configured?

The IADJ pin adjusts the LTC5510's internal mixer bias current. Leaving it floating sets nominal current (~105mA at 5V); adding a pull-down resistor lowers current and power consumption proportionally. For example, a 1.8kΩ resistor reduces current to ~94mA at 3.3V. The pin's open-circuit voltage is 1.8V, and short-circuit current is 1.9mA - enabling precise analog power scaling.