WM9001 Datasheet, PDF (1/25 Pages) Wolfson Microelectronics plc – 1W Dual-Mode Class AB/D Speaker Driver

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WM9001
1W Dual-Mode Class AB/D Speaker Driver
DESCRIPTION
FEATURES
The WM9001 is a powerful, high quality speaker driver which
can operate in class D or AB mode, providing total flexibility to
the system designer. Low leakage, high PSRR and pop/click
suppression enable direct battery connection to the speaker
supply. RF noise suppression techniques and differential design
are used to suppress undesired noise. A single-ended input
option has been included for complete system flexibility.
The device is enabled by setting a logic '1' on the EN pin. The
class D clock can be generated by an internal oscillator, or
supplied from an external clock source.
Flexible speaker boost options (requiring no additional
components) allow output volume to be maximised for various
SPKVDD/AVDD combinations while minimising internal power
consumption.
The WM9001 is available in a 3x3mm QFN package, ideal for
portable systems such as mobile phones, portable navigation
devices, media players, laptop computers and electronic
dictionaries.
• Class D and AB speaker driver modes for flexibility
• Speaker driver provides 1W into 8Ω at <0.1% THD
• SNR 102dB (Class AB), 97dB (Class D)
• Differential and single-ended input modes
• >80dB PSRR @ 217Hz (SPKVDD)
• <1μA typical leakage with direct battery connection
• Filterless speaker connection
• Fully differential architecture (differential mode)
• Pop/click suppression
• RF noise suppression
• Fully compatible with Wolfson CODECs
including WM8990 / WM8991
• Internal oscillator or external clock source
• Thermal shutdown protection
• 3x3mm QFN package
APPLICATIONS
• Mobile phones
• Portable navigation devices
• Portable media players
• Laptop computers and portable gaming devices
• Electronic dictionaries
• General-purpose high quality speaker amplifier
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
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Production Data, March 2010, Rev 4.1
Copyright ©2010 Wolfson Microelectronics plc