Analog Devices Inc. DC1431A-C

Overview

DC1431A-C from Analog Devices is an evaluation board for the LTC5542 high-dynamic-range passive downconverting mixer IC, supporting 1.6GHz–2.7GHz RF input and 1.7GHz–2.5GHz LO injection in low-side or high-side configurations. It delivers 8dB conversion gain, 26.8dBm IIP3, and 9.9dB noise figure at 2.4GHz with 190MHz IF output, enabling LTE/WiMAX receiver front-ends requiring wideband selectivity and blocking resilience.

For engineers reviewing the DC1431A-C datasheet, DC1431A-C pinout, DC1431A-C application, or DC1431A-C equivalent, this board provides validated RF/LO/IF matching networks-including 22pF/4.7pF capacitors, 150nH inductors, and Mini-Circuits TC4-1W-7ALN+ transformer-for rapid prototyping of 190MHz IF receivers with <±0.2dB gain flatness and >49dB LO switch isolation.

Technical Context

The DC1431A-C implements a complete downmixer signal chain using the LTC5542 IC, featuring single-ended 50Ω RF and LO inputs, differential open-collector IF outputs, and integrated SPDT LO switching with <50ns transition time. Its NELCO N4000-13 4-layer PCB stack-up ensures controlled impedance routing and thermal management via exposed-pad grounding.

It supports dual-supply operation (3.3V for mixer/LO switch, 3.3V–5V for IF amplifier), enabling P1dB extension from 11.3dBm to 14.7dBm when VCCIF is raised to 5V. The board includes configurable SHDN and LOSEL logic inputs, bypass capacitors per supply rail, and bandpass IF matching optimized for 190MHz output with 4:1 transformer coupling.

Key Specifications

Availability

DC1431A-C is available at Aetrix Electronics and suitable for LTE base station receivers, point-to-point microwave links, and high-selectivity wideband infrastructure applications requiring stable component supply and production-ready reference designs.

Supply support for DC1431A-C 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. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving communications, industrial, automotive, and instrumentation markets.

The DC1431A-C belongs to Analog Devices' evaluation board portfolio for RF signal chain components, designed to accelerate development of high-dynamic-range receiver systems with validated layout, matching, and thermal performance.

FAQ

What is the primary function of the DC1431A-C evaluation board?

The DC1431A-C evaluation board is a fully assembled and tested platform for the LTC5542 passive downconverting mixer IC. It enables immediate characterization of RF-to-IF conversion performance across 1.6–2.7GHz, including gain flatness, IIP3, noise figure, and LO switching behavior. Engineers use DC1431A-C to validate receiver front-end architectures before custom PCB design.

Does the DC1431A-C support both low-side and high-side LO injection?

Yes, the DC1431A-C supports both low-side and high-side LO injection modes as specified for the LTC5542 IC. The board's schematic and layout accommodate either configuration by reconfiguring LO drive frequency and IF filtering-verified in the standard test circuit (Figure 1) for 190MHz IF output with 2.3–2.7GHz RF input and 2.16GHz LO.

Can the IF output of the DC1431A-C be used differentially without the transformer?

Yes, the DC1431A-C IF outputs (IF+ and IF–) are differential open-collector nodes that can drive external differential filters or amplifiers directly. The board includes pads to bypass the Mini-Circuits TC4-1W-7ALN+ transformer, allowing users to implement discrete baluns or differential IF chains while maintaining DC bias via IFGND and IFBIAS pins on the LTC5542.

What power supply requirements does the DC1431A-C have?

The DC1431A-C requires two independent supplies: 3.1–3.5V @ ~99mA for the LTC5542 mixer and LO switch (VCC1/VCC2/VCC3), and 3.1–5.3V @ ~100mA for the IF amplifier (VCCIF). The board includes dedicated test points and decoupling capacitors for each rail, enabling P1dB optimization up to 14.7dBm when VCCIF is set to 5V.

How is LO port selection implemented on the DC1431A-C?

LO port selection on the DC1431A-C is controlled via the LOSEL pin (Pin 9) of the LTC5542, routed to a header for external logic-level control (0V/3.3V). When LOSEL is low, LO1 is active; when high, LO2 is selected. This enables frequency-hopping applications using two independent synthesizers, with measured LO switch isolation exceeding 49dB across 1.7–2.5GHz.