DESCRIPTION

The WM8973L is a low power, high quality stereo CODEC designed for portable digital audio applications.

The device integrates complete interfaces to stereo or mono microphones and a stereo headphone. External component requirements are drastically reduced as no separate microphone or headphone amplifiers are required.

Advanced on-chip digital signal processing performs graphic equaliser, 3-D sound enhancement and automatic level control for the microphone or line input.

The WM8973L can operate as a master or a slave, with various master clock frequencies including 12 or 24MHz for USB devices, or standard 256fs rates like 12.288MHz and 24.576MHz. Different audio sample rates such as 96kHz, 48kHz, 44.1kHz are generated directly from the master clock without the need for an external PLL.

The WM8973L operates at supply voltages down to 1.8V, although the digital core can operate at voltages down to 1.42V to save power, and the maximum for all supplies is 3.6 Volts. Different sections of the chip can also be powered down under software control.

The WM8973L is supplied in a very small and thin 5x5mm QFN package, ideal for use in hand-held and portable systems.

FEATURES

• DAC SNR 98dB (‘A’ weighted), THD –84dB at 48kHz, 3.3V

• ADC SNR 95dB (‘A’ weighted), THD -82dB at 48kHz, 3.3V

• Complete Stereo / Mono Microphone Interface

   - Programmable ALC / Noise Gate

• On-chip 400mW BTL Speaker Driver (mono)

• On-chip Headphone Driver

   - >40mW output power on 16 / 3.3V

   - THD –80dB at 20mW, SNR 90dB with 16 load

   - No DC blocking capacitors required (capless mode)

• Separately mixed mono output

• Digital Graphic Equaliser

• Low Power

   - 7mW stereo playback (1.8V / 1.5V supplies)

   - 14mW record & playback (1.8V / 1.5V supplies)

• Low Supply Voltages

   - Analogue 1.8V to 3.6V

   - Digital core: 1.42V to 3.6V

   - Digital I/O: 1.8V to 3.6V

• 256fs / 384fs or USB master clock rates: 12MHz, 24MHz

• Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48, 88.2, 96kHz generated internally from master clock

• 5x5x0.9mm QFN package

APPLICATIONS

• MP3 Player / Recorder

• AAC/WMA/Multi-Format Player / Recorder

• Minidisc Player / Recorder

• Portable Digital Music Systems