Analog Devices Inc. DC1431A-B

Overview

DC1431A-B from Analog Devices (formerly Linear Technology) is an evaluation board for the LTC5541 high-dynamic-range passive downconverting mixer IC. It supports 1.3GHz–2.3GHz RF input, 1.4GHz–2.0GHz LO range, and 5MHz–500MHz IF output with 7.8dB conversion gain, 26.4dBm IIP3, and 9.6dB noise figure at 1950MHz - enabling LTE/W-CDMA receiver front-ends with low-side or high-side LO injection.

For engineers reviewing the DC1431A-B datasheet, DC1431A-B pinout, DC1431A-B application, or DC1431A-B equivalent, this board provides a validated reference design for RF-to-IF signal chain validation, LO switching characterization, IF transformer matching (4:1 TC4-1W-7ALN+), and dual-supply operation (3.3V mixer / 3.3V–5V IF amplifier) in wireless infrastructure and point-to-point microwave receivers.

Technical Context

The DC1431A-B implements the standard downmixer test circuit from the LTC5541 datasheet (Figure 1), featuring 50Ω single-ended RF/LO inputs, differential open-collector IF outputs, and integrated 150nH RF/LO chokes plus 22pF/2.2pF AVX capacitors. It supports both low-side LO (e.g., RF=1700–2200MHz, fLO=fRF−190MHz) and high-side LO (e.g., RF=1300–1800MHz, fLO=fRF+190MHz) configurations.

Board-level functionality includes active LO selection via LOSEL (0V/3.3V logic), shutdown control (SHDN), adjustable IF bias (IFBIAS), and LO buffer current tuning (LOBIAS). The NELCO N4000-13 4-layer stack-up ensures controlled impedance routing and thermal management via the exposed pad soldered to ground plane.

Key Specifications

Availability

DC1431A-B is available at Aetrix Electronics and suitable for wireless infrastructure receivers, point-to-point microwave links, and high-dynamic-range downmixer applications requiring stable component supply, rapid prototyping validation, and production-ready RF layout reference.

Supply support for DC1431A-B 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 for precision signal processing and communications systems.

The DC1431A-B belongs to Analog Devices' evaluation board portfolio for RF mixers, designed specifically to accelerate development of LTE, W-CDMA, TD-SCDMA, and UMTS receiver front-ends using the LTC5541 family.

FAQ

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

The DC1431A-B evaluation board is a fully assembled and tested platform for characterizing the LTC5541 high-dynamic-range passive downconverting mixer. It enables engineers to validate RF-to-IF conversion performance, LO switching behavior, IF output matching (bandpass or lowpass), and dual-supply operation without custom PCB design - directly supporting LTE/W-CDMA receiver development.

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

Yes, the DC1431A-B supports both configurations per the LTC5541 datasheet. Low-side LO uses RF=1700–2200MHz with fLO=fRF−190MHz; high-side LO uses RF=1300–1800MHz with fLO=fRF+190MHz. The board's fixed 190MHz IF transformer (TC4-1W-7ALN+) and matching components are optimized for both modes.

How is IF output interfaced on the DC1431A-B?

The DC1431A-B provides differential IF outputs (IF+/IF−) terminated through a 4:1 Mini-Circuits TC4-1W-7ALN+ transformer to deliver a 50Ω single-ended IFOUT. IF bias is supplied via L1/L2 chokes from VCCIF (3.3V or 5V), with IFGND grounded and IFBIAS accessible for current tuning - matching the LTC5541's open-collector architecture.

Can the DC1431A-B be used to evaluate LO switching performance?

Yes. The DC1431A-B includes dedicated LO1IN and LO2IN SMA connectors, LOSEL control (0V/3.3V), and SHDN pin access - enabling direct measurement of LO switch isolation (>50dB), switching time (<50ns), and LO leakage (<–31dBm) as specified in the LTC5541 datasheet.

What power supply requirements does the DC1431A-B have?

The DC1431A-B requires two independent supplies: 3.1V–3.5V @ 92mA for the mixer/LO circuits (VCC), and 3.1V–5.3V @ 100mA for the IF amplifier (VCCIF). Using 5V on VCCIF increases RF input P1dB by ~3dB but raises total power consumption - a trade-off validated on this board.