WM8961 Datasheet, PDF (1/116 Pages) Wolfson Microelectronics plc – Ultra-Low Power Stereo CODEC with 1W Stereo Class D Speaker Drivers and Ground Referenced Headphone Drivers

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WM8961
Ultra-Low Power Stereo CODEC with 1W Stereo Class D
Speaker Drivers and Ground Referenced Headphone Drivers
DESCRIPTION
FEATURES
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.
• 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
WOLFSON MICROELECTRONICS plc
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Pre-Production, August 2009, Rev 3.1
Copyright ©2009 Wolfson Microelectronics plc