• Speaker driver provides 1W into 8Ω at <0.1% THD
• Speaker driver SNR 94dB (Class AB), 88dB (Class D)
• Class D and AB speaker driver modes for flexibility
• Differential and single-ended input configuration options
• >80dB PSRR
• <1uA leakage with direct battery connection
• Filterless connection
• Fully differential architecture 
•  AC or DC-coupled inputs
• Pop/click suppression 
•  RF noise suppression
• Fully compatible with Wolfson CODECs
  including WM8990 / WM8991
• Internal oscillator or external clock source
• Thermal shutdown protection
• 1.64x1.64mm W-CSP or 3x3mm QFN packages

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 very small and thin 1.64x1.64mm W-CSP or 3x3mm QFN packages, ideal for portable systems such as mobile phones, portable navigation devices, media players, laptop computers and electronic dictionaries.