FDA903S-6DY

Overview

The FDA903S-6DY is a single-channel Class-D automotive audio amplifier designed for telematics and e-Call applications. It integrates a 24-bit, 100 dB DAC conversion and PWM output stage with feedback before the LC filter. The device supports I2S and TDM digital inputs up to 16 channels with selectable sampling frequencies from 8 kHz to 96 kHz. It operates on a wide supply range of 3.3 V to 18 V and delivers typical power outputs of 10 W into 4 Ω or 5 W into 8 Ω at 14.4 V (1 kHz, THD=1%). Noise performance is specified at 38 μV A-weighted. The component is housed in a QFN32 package.

Feature Summary

• Integrates a 24-bit DAC with 100 dB resolution and PWM class-D output stage with pre-filter feedback.
• Supports I2S and TDM digital bit streams up to 16 channels with multiple sampling rates.
• Provides complete diagnostic capabilities during operation, including real-time load-current monitoring and digital admittance meter.
• Features two dedicated CD/Diag pins for clipping detection and system diagnostics.

Applications

• Automotive telematics systems
• e-Call emergency call units
• Warning-tone generators
• Acoustic Vehicle Alerting Systems (AVAS)

Procurement Notes

Verify the specific ordering suffix '-6DY' corresponds to the QFN32 tray packing configuration as listed in the product summary. Confirm that the required thermal management aligns with the junction-to-ambient resistance specifications provided in the datasheet. Ensure the application design accommodates the 3.3 V to 18 V operating voltage range and utilizes the appropriate I2C addressing scheme.

Selection Notes

Select this component for compact automotive audio designs requiring high integration. The pre-filter feedback architecture allows for smaller demodulator filter components, reducing cost and space. The inclusion of ASIL-A certification support through self-diagnostic algorithms makes it suitable for safety-related acoustic applications. Verify compatibility with the host microcontroller's I2S/TDM interface and I2C control requirements.

Part Context

The FDA903S belongs to STMicroelectronics' FDA series of D-class amplifiers specifically engineered for automotive environments. This generation focuses on providing advanced diagnostic features and robust speaker control to meet OEM reliability standards. The device represents a move towards fully digital audio processing within the amplifier block, minimizing external analog components.

Replacement Considerations

The FDA803S-6DY is a related model within the same family but lacks the load current monitor feature found in the FDA903S. When substituting, verify if the specific diagnostic requirements for the application can be met by the FDA803S capabilities.

FAQ

What is the maximum number of TDM channels supported?

The FDA903S supports I2S and TDM digital bit streams up to 16 channels.

Does the device support diagnostics while playing audio?

Yes, the FDA903S embeds a complete diagnostic in play, including real-time load-current monitoring and digital admittance meter.

What is the purpose of the two CD/Diag pins?

The two CD/Diag pins are used for clipping detection and various diagnostic outputs, which can be configured via I2C to report information such as thermal warnings or offset detection.