DESCRIPTION

The WM8961 is a low power, high quality stereo CODEC designed for portable digital audio applications.

An integrated charge pump provides a ground referenced output which removes the need for DC-blocking capacitors on the output, and uses the Wolfson ‘Class-W’ amplifier techniques - incorporating an innovative dual-mode charge pump architecture - to optimise efficiency and power consumption during playback. A DC Servo is used to reduce DC ground offsets. This improves power consumption and minimises pops and clicks.

FEATURES

• DAC SNR 98dB (‘A’ weighted), THD -83dB at 48kHz, 1.8V

• ADC SNR 88dB (‘A’ weighted), THD -75dB at 48kHz, 1.8V

• Stereo Class D Speaker Driver

- 1W per channel into 8Ω BTL speakers.

- Flexible internal switching clock

• Wolfson ‘Class-W’ ultra-low power headphone Driver

- Up to 22mW per channel output power at -80dB THD+N into 16Ω at 1.8V

- Ground Referenced

- Low offset (+/- 1.5mV)

- Pop and click suppression

- Control sequencer for pop-minimised start-up and shut-down

- Single register write for default start-up sequence

• Microphone Interface

- Single ended stereo input

- Integrated low noise MICBIAS

- Programmable ALC / Limiter and Noise Gate

• Low Power Consumption

- 6.99mW headphone playback (1.8V supplies, Low Power mode)

• Low Supply Voltages

- Analogue 1.71V to 2.0V (Speaker supply up to 5.5V)

- Charge pump 1.71V to 2.0V

- MIC bias amp supply 1.71V to 3.6V

- Digital 1.62V to 2.0V

• 2-wire serial control interface including read-back

• Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48

• 5x5x0.9mm 32 pin QFN package

APPLICATIONS

• Games consoles

• Portable media / DVD players

• Mobile multimedia