Analog Devices Inc. EVAL-ADF7021-VDB1Z

Overview

EVAL-ADF7021-VDB1Z from Analog Devices is a daughterboard evaluation module for the ADF7021-V 2FSK/3FSK/4FSK transceiver IC, optimized for 450–470 MHz operation using a 920 MHz VCO. It integrates loop filter, output matching circuit, TCXO (19.68 MHz), harmonic filter, and SMA RF interface, enabling rapid RF performance validation without external antenna switching.

For engineers reviewing the EVAL-ADF7021-VDB1Z datasheet, EVAL-ADF7021-VDB1Z pinout, EVAL-ADF7021-VDB1Z application, or EVAL-ADF7021-VDB1Z equivalent, this module supports register-level configuration via SPI, real-time demodulated data monitoring, IF filter calibration, analog RSSI access, and test DAC output for eye diagram and SNR analysis - all within a USB-connected ADIismLINK development ecosystem.

Technical Context

The EVAL-ADF7021-VDB1Z implements a low-IF architecture with 100 kHz IF bandwidth and uses an external 920 MHz VCO (SEV-3V920AP) paired with a precision 3.0 V LDO (ADP3300ARTZ-3). Its matching network eliminates need for external antenna switch and is tuned specifically for 450–470 MHz band operation.

It interfaces exclusively with the EVAL-ADF70XXMBZ2 mother board via a 14-pin vertical card connector (J1), supporting Tx/Rx data clocking (TxRxData/TxRxCLK), CE reset, and GPIO-based configuration (SDATA/SCLK/SLE/SREAD). Power is supplied separately (3.05–12 V) to the daughterboard's onboard regulator.

Key Specifications

Availability

EVAL-ADF7021-VDB1Z is available at Aetrix Electronics and suitable for RF prototyping, wireless sensor node development, industrial telemetry validation, and regulatory pre-compliance testing requiring stable component supply and traceable evaluation hardware.

Supply support for EVAL-ADF7021-VDB1Z 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 industrial, communications, automotive, and consumer markets with precision RF, power, and sensing solutions.

EVAL-ADF7021-VDB1Z belongs to Analog Devices' SRD (Short Range Device) evaluation platform family, designed to accelerate development of license-free and licensed-band sub-GHz wireless systems using the ADF7xxx transceiver series.

FAQ

What is the primary function of the EVAL-ADF7021-VDB1Z?

The EVAL-ADF7021-VDB1Z is a daughterboard evaluation module that hosts the ADF7021-V transceiver IC and provides a fully matched, calibrated RF reference design for 450–470 MHz operation. It enables rapid characterization of transmit power, receive sensitivity, phase noise, and modulation fidelity without custom RF layout - all while interfacing directly with the EVAL-ADF70XXMBZ2 mother board for control and power.

Which mother board is required to operate the EVAL-ADF7021-VDB1Z?

The EVAL-ADF7021-VDB1Z must be mounted on the EVAL-ADF70XXMBZ2 mother board (PCB Rev D or higher) to function. This multi-function board supplies USB connectivity, microcontroller-based register programming (via ADuC847), ADIismLINK protocol stack execution, and power regulation. The daughterboard connects via a 14-pin vertical card edge connector (J1) and requires separate 3.05–12 V DC input.

Does the EVAL-ADF7021-VDB1Z support multiple modulation schemes?

Yes, the EVAL-ADF7021-VDB1Z supports GFSK, FSK, MSK, 3FSK, RC3FSK, 4FSK, and RC4FSK modulation schemes through software-configurable register settings in the ADF7021-V IC. The ADF7021-V Configuration Software allows users to input target frequency, data rate, and deviation to auto-generate correct register values - verified via readback code 0x2120.

Can the EVAL-ADF7021-VDB1Z be used for sensitivity measurement?

Yes, the EVAL-ADF7021-VDB1Z supports precise receiver sensitivity testing. Using a calibrated signal generator set to –70 dBm, 2FSK, 4.8 kbps, and 2.4 kHz deviation, users can reduce input level until RxTxData waveform flickers on an oscilloscope - indicating bit errors. Typical measured sensitivity is –116 dBm ±2 dBm, validated with internal ADC readback of RSSI and frequency error.

Is external antenna switching required when using the EVAL-ADF7021-VDB1Z?

No, external antenna switching is not required. The EVAL-ADF7021-VDB1Z integrates a combined passive PA/LNA output matching circuit optimized for 450–470 MHz, leveraging the ADF7021-V's internal Rx/Tx switch. This eliminates discrete antenna switches and reduces BOM cost and PCB complexity while maintaining optimal transmit power and receive sensitivity.