The WM8510 is a low power, high quality mono codec designed for Voice over Internet Protocol (VoIP) and Digital Telephones. The device integrates support for one pseudo-differential and one single ended input (Handset Mic and Speaker Mic) and includes drivers for speakers or headset, and mono line output, making it ideal for Telephone designs. External component requirements are reduced as no separate microphone or earpiece amplifiers are required. Advanced Delta Sigma Converters are used along with digital decimation and interpolation filters to give high quality audio at sample rates from 8 to 48kHz. Additional digital filtering options are available in the ADC path, to cater for application filtering such as ‘wind noise reduction’, plus an advanced mixed signal ALC function with noise gate is provided. An on-chip PLL is provided to generate the required Master Clock from an external reference clock. The PLL clock can also be output if required elsewhere in the system. The WM8510 operates at supply voltages from 2.5 to 3.6V, although the digital supplies can operate at voltages down to 1.71V to save power. The speaker and mono outputs use a separate supply of up to 5V which enables increased output power if required. Different sections of the chip can also be powered down under software control by way of the selectable two or three wire control interface. WM8510 is supplied in a convenient 28-lead SSOP package, offering high levels of functionality in an easy to use package.