Analog Devices Inc. EVAL-CN0285-EB1Z

Overview

EVAL-CN0285-EB1Z from Analog Devices is an evaluation board for the CN-0285 broadband low-EVM direct-conversion transmitter, integrating ADF4351 wideband PLL+VCO, ADL5375 IQ modulator, 25 MHz TCXO reference, ultralow-noise LDOs (ADP150, ADP3334), and USB interface for PC control. It supports RF output frequency programming via ADF435x software and enables EVM/ACLR characterization of wideband Tx signal chains.

For engineers reviewing the EVAL-CN0285-EB1Z datasheet, EVAL-CN0285-EB1Z pinout, EVAL-CN0285-EB1Z application, or EVAL-CN0285-EB1Z equivalent, this board serves as a validated hardware platform to evaluate high-performance RF transmitter architectures using integrated PLL synthesis and IQ modulation - critical for 5G infrastructure prototyping, wireless test equipment development, and RFIC validation workflows.

Technical Context

The EVAL-CN0285-EB1Z implements a complete RF transmit signal chain: the ADF4351 synthesizes tunable LO signals (137.5 MHz to 4400 MHz) with fractional-N PLL architecture and integrated VCO; the ADL5375 accepts differential baseband IQ inputs (0.5 V dc bias) and upconverts them to RF outputs with >1 GHz bandwidth and low EVM performance.

Power delivery uses dual ultralow-noise LDOs (ADP150 for digital logic, ADP3334 for analog/RF sections); a 25 MHz Rakon TCXO provides stable reference timing, with option to substitute external REFIN by disabling onboard oscillator via R59 removal.

Key Specifications

Availability

EVAL-CN0285-EB1Z is available at Aetrix Electronics and suitable for RF transceiver prototyping, 5G base station development, wireless test equipment calibration, and RFIC validation requiring stable component supply and documented reference design fidelity.

Supply support for EVAL-CN0285-EB1Z 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.

EVAL-CN0285-EB1Z belongs to Analog Devices' Circuits from the Lab™ series - purpose-built evaluation platforms that validate real-world RF, precision, and power management reference designs for rapid system-level testing and integration.

FAQ

What is the primary function of the EVAL-CN0285-EB1Z?

The EVAL-CN0285-EB1Z is an evaluation board designed to validate the CN-0285 broadband low-EVM direct-conversion transmitter circuit. It integrates the ADF4351 PLL+VCO, ADL5375 IQ modulator, 25 MHz TCXO, and supporting LDOs to enable lab-based characterization of RF transmit performance - including EVM, ACLR, and spectral purity - without custom PCB development. The EVAL-CN0285-EB1Z provides immediate access to all key signal paths and control interfaces.

Which software is required to operate the EVAL-CN0285-EB1Z?

The EVAL-CN0285-EB1Z uses the standard Analog Devices ADF435x programming software for frequency control and configuration. This software communicates over USB and provides a GUI front panel to program the ADF4351 synthesizer's RF output frequency, loop filter settings, and charge pump current. No additional firmware or proprietary drivers are needed beyond the included USB interface and Windows-compatible installation package referenced in UG-435.

Can the EVAL-CN0285-EB1Z accept external reference inputs?

Yes, the EVAL-CN0285-EB1Z supports external reference input (REFIN) by disabling the onboard 25 MHz TCXO - achieved by removing resistor R59. Impedance matching to the external source is enabled by populating R9 with a 50 Ω resistor. This allows synchronization to lab-grade signal generators or system-level clock trees, preserving phase coherence across multi-board test setups involving the EVAL-CN0285-EB1Z.

What are the power requirements for the EVAL-CN0285-EB1Z?

The EVAL-CN0285-EB1Z requires a 5.5 V DC supply delivered via 4 mm banana connectors (VSUPPLY). USB power only powers status LED D6 and does not drive the RF circuitry. LED D5 illuminates when main board power is applied. Switch SW-EXT selects between USB and external supply. The board draws current from ADP150 (digital) and ADP3334 (analog/RF) LDOs, both optimized for ultralow noise in sensitive RF signal paths.

How is RF output measured on the EVAL-CN0285-EB1Z?

RF output is accessed via the ac-coupled RFOUT SMA connector. Two additional LO output SMA ports allow viewing filtered ADF4351 outputs on a spectrum analyzer; unused LO ports must be terminated with 50 Ω loads. For accurate EVM or ACLR measurements, capacitors C72 and C73 should be removed to isolate LO outputs and prevent loading of the ADL5375 RF path - a procedure explicitly defined in UG-521 for maintaining signal integrity during evaluation of the EVAL-CN0285-EB1Z.