STMicroelectronics EVAL-FDA903S-SA

Overview

EVAL-FDA903S-SA from STMicroelectronics is an evaluation board for the FDA903S and FDA803S automotive-grade digital Class-D mono audio power amplifiers in QFN32 (exposed pad down) package, supporting I²S/TDM digital input, I²C control, 3.3–18 V supply, and full diagnostic reporting - deployed in infotainment head units and ADAS display audio subsystems.

For engineers reviewing the EVAL-FDA903S-SA datasheet, EVAL-FDA903S-SA pinout, EVAL-FDA903S-SA application, or EVAL-FDA903S-SA equivalent, key selection considerations include its support for battery-voltage operation (3.3–18 V), dual-amplifier compatibility (FDA803S/FDA903S), I²S/TDM interface flexibility, integrated diagnostics, and QFN32 footprint validation capability.

Technical Context

The board implements a complete signal chain for evaluating ST's FDA903S amplifier: it routes digital audio via configurable I²S/TDM lanes, provides I²C-based register access to amplifier configuration and status registers, and conditions power with wide-input DC-DC pre-regulation (3.3–18 V). On-board test points and jumpers enable real-time monitoring of fault flags, thermal status, and output current sensing.

It supports both FDA803S (45 W) and FDA903S (75 W) devices in identical QFN32 (5 × 5 mm, 0.5 mm pitch, exposed thermal pad down) packages, allowing direct comparison of thermal performance, THD+N, and EMI behavior under identical PCB layout and power delivery conditions.

Key Specifications

Availability

EVAL-FDA903S-SA is available at Aetrix Electronics and suitable for automotive infotainment development, ADAS display audio integration, and Class-D amplifier qualification requiring stable component supply and validated reference design access.

Supply support for EVAL-FDA903S-SA 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, analog ICs, power management, sensors, and automotive-grade ASSPs.

EVAL-FDA903S-SA belongs to ST's automotive audio evaluation platform family, engineered to accelerate qualification of Class-D amplifier solutions in safety-critical and thermally constrained vehicle environments.

FAQ

Does EVAL-FDA903S-SA support both FDA803S and FDA903S devices?

Yes. The board is mechanically and electrically compatible with both FDA803S (45 W) and FDA903S (75 W) in identical QFN32 (5 × 5 mm, exposed pad down) packages. All interface signals, power routing, thermal vias, and diagnostic circuitry are shared, enabling side-by-side performance and thermal validation.

What audio formats does the board accept via I²S/TDM?

The board accepts standard I²S (left-justified, right-justified, and DSP modes) and TDM up to 32 slots at sample rates from 32 kHz to 96 kHz. Format selection is controlled by hardware strapping resistors and can be overridden via I²C register writes to the target FDA device.

Is external power regulation required?

No. The board accepts 3.3–18 V DC directly and includes on-board DC-DC pre-regulation to generate stable 5 V and 3.3 V rails for logic and analog sections. This eliminates need for external regulators during evaluation and matches automotive battery voltage range.

Can EVAL-FDA903S-SA be used for EMC pre-compliance testing?

Yes. The board implements ST-recommended EMI mitigation techniques: split ground planes, ferrite-bead filtered power inputs, shielded I²C routing, and optimized thermal via patterns under the QFN32 exposed pad - all documented in DB4688 for repeatable pre-compliance radiated/conducted emission measurements.