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Mobile Multimedia DAC with
Dual-Mode Class AB/D Speaker Driver
DESCRIPTION
The WM8959 is an ultra-low power hi-fi DAC designed for
multimedia handsets.
A powerful 1W speaker driver can operate in class D or AB
modes, providing total flexibility to the system designer. Low
leakage, high PSRR and pop/click suppression enable direct
battery connection for the speaker supply.
A flexible input configuration supports two microphone inputs
(single-ended or differential), a stereo line input, and a mono
differential line input.
Four headphone drivers support fully differential headset drive,
providing excellent crosstalk performance and bass response,
maximising stereo effects, and allowing the removal of large
and expensive headphone capacitors. The headphone outputs
can also be configured to drive an ear speaker. A fully
differential path to these outputs direct from the input pins is
available to maximise signal quality and minimise power
consumption.
Stereo 24-bit sigma-delta DACs provide hi-fi quality audio
playback, with a flexible digital audio interface supporting most
commonly-used clocking schemes. An integrated low power
PLL provides additional flexibility.
The WM8959 is supplied in very small and thin 42-ball WCSP
package, ideal for portable systems.
WM8959
FEATURES
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DAC SNR 99dB (‘A’ weighted), THD -84dB at 48kHz, 3.3V
Stereo microphone interface
1W Speaker driver
- 1W into 8Ω BTL speaker at <0.1% THD
- 80dB PSRR @ 217Hz
- <1uA leakage with direct battery connection
- Software-selectable class D or AB mode
- Filterless connection supported
Headphone / ear speaker drivers
- 40mW output power into 16Ω at 3.3V
- Fully differential and capless modes supported
- Low noise, lower power received voice path
Stereo or Mono differential line output
Pop/Click suppression
Powerful GPIO functions
Ultra-low power consumption
- 8.3mW analogue voice call
- 13.7mW DAC playback to headphones
On-chip PLL provides flexible clocking scheme
Sample rates: 8, 11.025, 12, 16, 22.05, 24, 32, 44.1, 48kHz
42-ball WCSP package (3.226x3.44x0.7mm, 0.5mm pitch)
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APPLICATIONS
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Multimedia phones
GPS
WOLFSON MICROELECTRONICS plc
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Pre-Production, May 2008, Rev 3.1
Copyright
©2008
Wolfson Microelectronics plc
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
