AS3518-T

Codecs Overview

The AS3518 is a low-power stereo audio codec designed for portable digital audio applications, supporting CD-quality playback and recording. It integrates multi-bit Sigma-Delta converters with an 18-bit DAC (94dB SNR) and a 20-bit ADC (90dB SNR), operating at sampling frequencies from 8kHz to 48kHz. The device features a single supply voltage range of 1.0V to 5.5V and consumes less than 20mW in playback mode. It includes a high-efficiency headphone amplifier capable of 2x60mW into 16Ω, a Li-Ion battery charger, and an ultra-low power real-time clock consuming under 1µA. The IC is housed in a CTBGA64 package with a 0.8mm pitch.

Codecs Feature Summary

• Integrated stereo audio codec with multi-bit Sigma-Delta converters for high-fidelity playback and recording
• Comprehensive power management system including step-down regulators, LDOs, and a step-up backlight driver
• Built-in Li-Ion battery charger with programmable constant current and voltage settings
• Ultra-low power real-time clock with auto wake-up capability for extended standby modes

Codecs Applications

• Portable Digital Audio Players and Recorders
• Personal Digital Assistants (PDAs)
• Smartphones

Codecs Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to ensure compatibility with required package variants or temperature grades. Confirm that the component meets all electrical specifications for the intended application environment before integration. Check for any preliminary status updates or revision changes that may affect design-in parameters.

Codecs Selection Notes

Select this component for designs requiring integrated audio processing and power management in a compact form factor. Ensure the host processor supports I2S or SPDIF interfaces for digital audio data transfer. Verify that the available supply voltage range aligns with the system's battery or external power source capabilities. Consider the CTBGA64 package constraints during PCB layout planning.

Codecs Part Context

The AS3518 was developed by austriamicrosystems AG, which later became part of ams-OSRAM USA INC. This component represents an early integration of audio codec functions with extensive power management features, targeting the mobile multimedia market during the transition period of portable electronics. It serves as a specialized solution for devices needing efficient audio handling and battery charging within a single chip.

Codecs Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided datasheet. Designers should consult the manufacturer's official obsolescence notices or cross-reference tools for verified alternatives if this component is no longer in production.

Codecs FAQ

What is the maximum output power of the headphone amplifier?

The high-efficiency headphone amplifier provides a driver capability of 2x60mW into a 16Ω load.

Does the AS3518 include a real-time clock?

Yes, it contains an independent 32kHz real-time clock with a 32-bit counter, selectable alarms, and ultra-low power consumption of less than 1µA.

How is the volume control managed?

Volume control for line inputs, line outputs, and the headphone amplifier is managed via a serial interface with 32 steps at 1.5dB resolution and mute functionality.