WM8961: CODEC with Class D Speaker Driver
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.
Stereo class D speaker drivers provide 1W per channel into 8Ω loads with a 5V supply. Low leakage, excellent PSRR and pop/click suppression mechanisms also allow direct battery connection to the speaker supply. Flexible speaker boost settings allow speaker output power to be maximised while minimising other analogue supply currents.
Control sequences for audio path setup can be pre-loaded and executed by an integrated sequencer to reduce software driver development and eliminate pops and clicks via Wolfson’s SilentSwitch™ technology.
Flexible input configuration : a stereo input or two mono inputs on Lch or Rch ADC, with a complete microphone interface. External component requirements are drastically reduced as no separate microphone, speaker or headphone amplifiers are required. Advanced on-chip digital signal processing performs automatic level control for the microphone or line input.
Stereo 24-bit sigma-delta ADCs and DACs are used with low power over-sampling digital interpolation and decimation filters and a flexible digital audio interface.
The WM8961 operates at analogue supply voltages down to 1.71V, although the digital supplies can operate at voltages down to 1.62V to save power. The speaker supply can operate at up to 5.5V, providing 1W per channel into 8Ω loads. Unused functions can be disabled using software control to save power.
The WM8961 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 -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 8ΩBTL 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
Support
Ordering & Samples
