Analog Devices Inc. DC1719A

Overview

DC1719A from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC5569 dual active downconverting mixer IC, designed to demonstrate RF-to-IF signal conversion in diversity and MIMO receiver systems. It supports 300MHz–4GHz RF input, 350MHz–4.5GHz LO input, and delivers 2dB typical conversion gain, 26.8dBm IIP3 at 1950MHz, 11.7dB noise figure, and 44dB channel isolation in a 16-lead 4mm × 4mm QFN package.

For engineers reviewing the DC1719A datasheet, DC1719A pinout, DC1719A application, or DC1719A equivalent, this page provides verified layout details, IF matching component values (e.g., 180nH inductors for 190MHz bandpass), thermal management guidance (exposed pad soldered to PCB ground), supply current profiles (180mA @ 3.3V with both mixers enabled), and validated test circuit configurations per Figure 1 of the LTC5569 datasheet.

Technical Context

The DC1719A implements the standard downmixer test circuit from LTC5569 datasheet Figure 1, using Mini-Circuits TC8-1-10LN+ 8:1 IF transformers and Coilcraft 0603HP 180nH inductors for 190MHz bandpass IF output matching. It supports both high-side and low-side LO injection, with external matching networks optimized for 1400–3000MHz RF (2.7pF series C), 1–3.5GHz LO (3.9pF C5), and differential IF biasing via transformer center tap or discrete inductors.

Board-level design incorporates NELCO N4000-13 layer stack-up, dedicated RF ground plane connected to pins 2, 3, 10 and exposed pad (pin 17), and bypass capacitors (10nF, 2.2µF) placed adjacent to VCCA/VCCB pins. All RF/LO traces are 50Ω controlled impedance, and DC-blocking capacitors (C1–C4) isolate DC voltage from RFA/RFB/LO inputs as required by LTC5569's internal transformer topology.

Key Specifications

Availability

DC1719A is available at Aetrix Electronics and suitable for wireless infrastructure diversity receivers, MIMO base station remote radio units, and 5G NR FR1 front-end prototyping requiring stable component supply, traceable sourcing, and documented RF validation data.

Supply support for DC1719A 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 portfolio, including precision mixers, synthesizers, and demodulators for communications infrastructure.

The DC1719A belongs to Linear Technology's evaluation board family for RF signal chain components, specifically engineered to validate LTC5569 performance in real-world diversity receiver architectures with minimal external component count.

FAQ

What is the primary function of the DC1719A evaluation board?

The DC1719A evaluation board is a fully assembled and tested platform for the LTC5569 dual active downconverting mixer IC. Its primary function is to enable rapid characterization of RF-to-IF conversion performance-including conversion gain, IIP3, noise figure, and channel isolation-across 300MHz–4GHz RF and 350MHz–4.5GHz LO bands. The DC1719A implements the reference test circuit from the LTC5569 datasheet, supporting both high-side and low-side LO injection with validated 190MHz bandpass IF matching.

Which RF and LO frequency ranges are validated on the DC1719A board?

The DC1719A board is validated for 1400–3000MHz RF input using 2.7pF series capacitors (C1/C2), and 1–3.5GHz LO input using 3.9pF capacitor C5. External matching allows extension to 300–400MHz (with 120pF C1/C2 and 3.3nH L5/L6) and 3–4GHz (with 3.9pF C1/C2 and 0.7pF C3/C4). The DC1719A schematic and layout match Figure 1 of the LTC5569 datasheet, with component values tabulated for each band.

How is the IF output configured and matched on the DC1719A?

The DC1719A configures the LTC5569's differential IF outputs (IFA+/IFA–, IFB+/IFB–) using Mini-Circuits TC8-1-10LN+ 8:1 transformers and Coilcraft 0603HP 180nH inductors (L1–L4) to realize 50Ω single-ended IF outputs at 190MHz. The inductors resonate with the LTC5569's internal 1.3pF IF capacitance, and the transformer center tap provides DC bias path. This configuration achieves measured IF return loss better than –15dB across 150–250MHz, as shown in Figure 9 of the LTC5569 datasheet.

What power supply requirements does the DC1719A have?

The DC1719A requires a single 3.3V supply delivering up to 212mA maximum (per DC electrical characteristics: 106mA typical with both mixers enabled). Bypassing uses 10nF (C7–C10) and 2.2µF (C11) AVX 0402/0603 capacitors placed adjacent to VCCA (pin 13) and VCCB (pin 8). The board's exposed thermal pad (pin 17) must be soldered to the PCB ground plane to ensure thermal stability and meet the LTC5569's θJC = 8°C/W specification.

Can the DC1719A be used for both diversity and MIMO receiver testing?

Yes, the DC1719A is explicitly designed for diversity and MIMO receiver applications, as stated in the LTC5569 datasheet Applications section. Its dual-mixer architecture-with independent ENA/ENB enable pins, symmetric RF/LO paths, and isolated IF outputs-enables simultaneous evaluation of channel correlation, phase coherence, and isolation (≥44dB). The board supports independent control of each mixer's bias and enables real-time comparison of RF signal paths under identical LO conditions, critical for MIMO antenna array validation.