Analog Devices Inc. ADRF6520-EVALZ

Overview

ADRF6520-EVALZ from Analog Devices is an evaluation board designed to characterize the ADRF6520 dual-channel, programmable low-pass filters and variable gain amplifiers (VGAs) for microwave radio applications with 2 GHz channel spacing. It supports single-ended and differential configurations, enables analog gain control (0 V to 1.5 V), provides SPI-programmable filter corner selection (up to 720 MHz), and includes on-chip RMS detectors with ~70 kHz video bandwidth.

For engineers reviewing the ADRF6520-EVALZ datasheet, ADRF6520-EVALZ setup procedure, ADRF6520-EVALZ software interface, or ADRF6520-EVALZ hardware modification options, this page delivers verified layout details, power-up sequence, test-point mapping, SDP-S controller integration, and configuration tradeoffs for filter mode vs. bypass mode operation.

Technical Context

The ADRF6520-EVALZ implements a complete signal chain interface for the ADRF6520 IC, featuring matched 50 Ω SMA input/output paths (INP1/INP2, OPP1/OPP2), analog gain control via blue/orange test points (VGN1/VGN2), and SPI access through P3 header (SDIO/SCLK/CS) or SDP-S controller via P5. It supports both default filter-bypass mode (>1 GHz bandwidth) and programmable low-pass filtering.

Hardware design includes balun-based single-ended-to-differential conversion capability (T1–T4), dc offset correction loop (500 Hz high-pass corner with C9/C16), RMS detector output routing (VRMS SMA or P2 header), and configurable network impedance matching using 0 Ω jumpers and resistor footprints (R1–R8, R9–R16, etc.).

Key Specifications

Availability

ADRF6520-EVALZ is available at Aetrix Electronics and suitable for microwave radio development, RF front-end validation, and high-speed ADC/demodulator interface testing requiring stable component supply and full-featured evaluation infrastructure.

Supply support for ADRF6520-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 digital signal processing semiconductors, headquartered in Norwood, MA.

The ADRF6520-EVALZ belongs to Analog Devices' RF & Microwave evaluation platform family, engineered specifically to accelerate characterization and system integration of programmable RF signal conditioning ICs in wireless infrastructure and point-to-point radio applications.

FAQ

What is the primary function of the ADRF6520-EVALZ?

The ADRF6520-EVALZ is a dedicated evaluation board for the ADRF6520 dual-channel programmable low-pass filter and VGA IC. It enables engineers to validate filter response, analog gain control behavior, RMS detection accuracy, dc offset correction performance, and SPI register configuration - all under real-world test conditions using standard lab equipment like signal generators and spectrum analyzers. The ADRF6520-EVALZ itself contains no active silicon beyond the ADRF6520-ACPZ and supporting passive components.

How do I configure the ADRF6520-EVALZ for differential operation?

To configure the ADRF6520-EVALZ for differential I/O, depopulate baluns T1/T3 (for Channel 1 input/output) and install 0 Ω resistors at designated pads (T1_1/T1_3/T1_4/T1_5 and T3_1/T3_3/T3_4/T3_5), while populating R42/R44. Similar modifications apply to Channel 2 using T2/T4. The board's silkscreen and UG-1045 schematics identify exact pad locations. Differential mode requires external baluns or transformer-coupled sources/sinks and alters common-mode voltage handling.

What power supply requirements does the ADRF6520-EVALZ have?

The ADRF6520-EVALZ requires a single 3.3 V supply capable of delivering ≥600 mA, applied between the red VPS test point and any green COM1/COM2/COM3 ground point. Default power-up current draw is ~395 mA in filter-bypass mode and increases to ~425 mA when filters are enabled. Separate 0 V supplies (≤1 mA limit) must be applied to VGN1 and VGN2 test points for gain control initialization.

Can I use the ADRF6520-EVALZ without the SDP-S controller board?

Yes - the ADRF6520-EVALZ provides direct SPI access via the P3 3×2 pin header (SDIO, SCLK, CS on pins 1/3/5; all grounded on pins 2/4/6), enabling custom microcontroller-based programming. However, the official ADRF6520 Evaluation Software and GUI require the SDP-S controller board connected via the 120-pin P5 interface. Standalone SPI use demands manual register writes per the ADRF6520 data sheet.

What is the role of the VRMS connector on the ADRF6520-EVALZ?

The VRMS SMA connector provides direct access to the output of the ADRF6520's integrated RMS detectors, allowing measurement of signal envelope magnitude. It can also be accessed via the 2-pin P2 header for low-parasitic FET probe connections. The detector's video bandwidth (~70 kHz) is set by C7/C8 (10 nF); changing these capacitors adjusts response time and bandwidth - critical for AGC loop stability in modulated signal applications.