Analog Devices Inc. ADRF6821-EVALZ

Overview

ADRF6821-EVALZ from Analog Devices is a 4-layer Rogers PCB evaluation board designed to characterize the ADRF6821 RFIC-a wideband quadrature demodulator with integrated fractional-N PLL/VCO, supporting 450 MHz to 2800 MHz RF input and 900 MHz to 5600 MHz 2×LO generation. It enables full register control via SDP-S controller and ACE software, features single-ended RF inputs, differential I/Q outputs with 70 Ω impedance, and operates from a 5.6 V supply.

For engineers reviewing the ADRF6821-EVALZ datasheet, ADRF6821-EVALZ pinout, ADRF6821-EVALZ application, or ADRF6821-EVALZ equivalent, this page delivers verified hardware configuration details, SPI interface requirements, LO sourcing options (internal synthesizer or external 900–5600 MHz differential signal), output matching network loss (7.5 dB), and ACE GUI workflow for PLL lock, RF selection, and IF path enablement.

Technical Context

The ADRF6821-EVALZ implements a complete test platform for the ADRF6821 RFIC, including on-board 5.6 V to 3.3 V LDO regulation, SMA connectors for RF/IF/LO/reference signals, and a 20 kHz bandwidth loop filter optimized for PLL stability. It supports both internal LO generation (via on-chip fractional-N synthesizer and VCO) and external LO injection through EX_LO_IN+ and EX_LO_IN− terminals.

Default operation uses a single-ended LO input applied to EX_LO_IN− with on-board balun conversion to differential; I/Q outputs are configured as single-ended via TC1-1-13MX+ transformers and resistive matching networks delivering 100 Ω differential termination in 50 Ω instrument environments. The board requires the SDP-S controller board and ACE software for SPI communication and real-time register programming.

Key Specifications

Availability

ADRF6821-EVALZ is available at Aetrix Electronics and suitable for RF receiver characterization, wireless infrastructure prototyping, and high-speed ADC driver validation requiring stable component supply and traceable evaluation hardware.

Supply support for ADRF6821-EVALZ 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 RF IC design, headquartered in Wilmington, MA, with deep expertise in signal processing, precision conversion, and radio frequency systems.

The ADRF6821-EVALZ belongs to Analog Devices' RF evaluation kit product line, engineered specifically to accelerate development of wideband direct-conversion receivers using the ADRF6821 demodulator IC in communications, defense, and test equipment applications.

FAQ

What is the primary function of the ADRF6821-EVALZ?

The ADRF6821-EVALZ is an evaluation board-not an IC-that enables full functional testing and performance characterization of the ADRF6821 RFIC. It provides regulated power, RF/LO/IF connectivity, SPI interface to SDP-S, and ACE software integration. The ADRF6821-EVALZ does not perform signal processing itself; it hosts and exercises the ADRF6821 chip under user-defined configurations.

Which controller board is required to operate the ADRF6821-EVALZ?

The ADRF6821-EVALZ requires the SDP-S controller board (Analog Devices part number SDP-S) for SPI communication and register programming. The SDP-S connects via USB to a Windows PC running ACE software, providing the hardware interface layer needed to configure the ADRF6821 on the ADRF6821-EVALZ board.

Does the ADRF6821-EVALZ support both internal and external LO sources?

Yes-the ADRF6821-EVALZ supports dual LO modes. Internal LO uses the ADRF6821's integrated fractional-N PLL and VCO (900–5600 MHz 2×LO); external LO applies a differential signal (900–5600 MHz) to EX_LO_IN+ and EX_LO_IN−. Default configuration accepts single-ended LO on EX_LO_IN− with on-board balun conversion.

What is the purpose of the 7.5 dB loss in the I/Q output path of the ADRF6821-EVALZ?

The 7.5 dB loss arises from the resistive matching network used to convert the ADRF6821's native 70 Ω differential I/Q output impedance to 100 Ω for optimal termination in standard 50 Ω test equipment environments. This loss is fixed and must be factored into measured signal levels when using spectrum analyzers or digitizers.

Can the ADRF6821-EVALZ be used without the ACE software?

No-ACE (Analysis Control Evaluation) software is mandatory for configuring the ADRF6821 on the ADRF6821-EVALZ. ACE provides the GUI, register map interface, PLL lock automation, and real-time control of RF selection, LO frequency, attenuation, and path enables. Without ACE and the SDP-S controller, the ADRF6821-EVALZ cannot be meaningfully operated or calibrated.