Analog Devices Inc. AD8369-EVALZ

Overview

AD8369-EVALZ from Analog Devices is a fully populated evaluation board for the AD8369 digitally controlled variable gain amplifier (VGA), supporting 45 dB gain control in 3 dB steps from DC to 600 MHz. It enables rapid characterization of differential signal paths, serial/parallel interface timing, and RF performance metrics including IP3, IMD3, and noise figure across gain codes and frequencies up to 380 MHz. Designed for IF sampling receiver and base station transceiver development.

For engineers reviewing the AD8369-EVALZ datasheet, AD8369-EVALZ pinout, AD8369-EVALZ application, or AD8369-EVALZ equivalent, this board provides validated reference schematics, layout-optimized RF routing, calibrated gain step response measurement capability, and direct access to all digital control pins (BIT0–BIT3, DENB, SENB, PWUP) and analog I/O (INHI/INLO, OPHI/OPLO, CMDC, FILT).

Technical Context

The AD8369-EVALZ implements the AD8369 VGA in a fully differential configuration with matched 200 Ω input/output impedance, ac-coupled signal paths, and on-board bypassing for VPOS, CMDC, and FILT. It supports both parallel (4-bit transparent/latched) and serial (3-wire) digital control modes via jumper-selectable SENB configuration.

Board-level design includes TC4-1W broadband transformer for single-ended-to-differential conversion, 0.1 µF AC-coupling capacitors at all I/O ports, and dedicated test points for INHI, INLO, OPHI, OPLO, PWUP, and DENB. Power delivery uses a single 3.0 V–5.5 V supply with onboard ceramic decoupling per Analog Devices' recommended layout.

Key Specifications

Availability

AD8369-EVALZ is available at Aetrix Electronics and suitable for cellular base station prototyping, IF sampling receiver validation, fixed wireless access system integration, and instrumentation-grade RF gain calibration requiring stable component supply and traceable evaluation hardware.

Supply support for AD8369-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 AD8369-EVALZ belongs to Analog Devices' RF & Microwave Evaluation Platform family, designed specifically to accelerate time-to-test for high-speed, wideband VGAs used in communications infrastructure and precision instrumentation.

FAQ

What is the primary function of the AD8369-EVALZ?

The AD8369-EVALZ is a fully populated evaluation board for the AD8369 digitally controlled VGA. It provides immediate hardware access to all analog and digital interfaces of the AD8369, enabling engineers to validate gain linearity, frequency response, distortion performance (IMD3, IP3), and digital control timing without custom PCB design. The board includes transformers, SMA connectors, and test points aligned to the AD8369's functional requirements.

Does the AD8369-EVALZ support both serial and parallel digital control modes?

Yes, the AD8369-EVALZ supports both modes via an onboard jumper that configures the SENB pin. When SENB is tied to ground, the AD8369 operates in parallel mode using BIT0–BIT3 and DENB; when tied to VPOS, it enters serial mode using BIT0 as data, BIT1 as clock, and DENB as latch. All timing specifications-including setup/hold times and 30 ns gain step response-are preserved per the AD8369 datasheet on the AD8369-EVALZ.

What are the key RF performance validation capabilities of the AD8369-EVALZ?

The AD8369-EVALZ enables direct measurement of critical RF parameters: two-tone IMD3 (–69 dBc at 70 MHz), output IP3 (+19.5 dBm), noise figure (7 dB at max gain), and gain flatness (±0.1 dB within ±20 MHz bandwidth up to 380 MHz). Its layout preserves signal integrity with controlled-impedance traces, matched differential paths, and calibrated SMA connections-ensuring measurements reflect true AD8369 behavior.

Can the AD8369-EVALZ be used with single-ended signal sources?

Yes. The AD8369-EVALZ includes a TC4-1W broadband transformer to convert single-ended 50 Ω inputs to the AD8369's required differential 200 Ω interface. Input coupling capacitors (0.1 µF) and common-mode decoupling at CMDC allow stable operation with single-ended drivers. Output can be monitored differentially via SMA or converted back using external baluns.

Is power-down functionality accessible on the AD8369-EVALZ?

Yes. The PWUP pin of the AD8369 is brought out to a test point and header on the AD8369-EVALZ. Applying logic low (<1.0 V) to PWUP reduces total current draw to <1 mA, placing the AD8369 in power-down mode with < few mW dissipation. This function is fully operational and verified per the AD8369's absolute maximum ratings and timing spec (7 ms power-up response).