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The WM8952 is a low power, high quality mono ADC designed for portable applications such as wireless microphones or headsets. The device integrates support for differential or single ended microphone connections. External component requirements are reduced as no separate microphone amplifier is required.
An advanced Sigma Delta Converter design is used to give high quality audio at sample rates from 8 to 48ks/s. A selectable high pass filter and four fully-programmable notch filters are also available in the signal path. An advanced mixed signal ALC function with noise gate is provided, supporting readback of PGA gain during ALC operation. The digital audio interface supports A-law and µ-law companding.
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 WM8952 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. Different sections of the chip can also be powered down under software control using the selectable two or three wire control interface. The device is supplied in a very small W-CSP package, offering high levels of functionality in minimum board area, with high thermal performance.
FeaturesMono ADC:Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHzADC SNR 94dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s)Mic Preamps : Differential or single end Microphone Interface - Programmable preamp gain - Pseudo differential inputs with common mode rejection - Programmable ALC / Noise Gate in ADC pathLow-noise bias supplied for electret microphonesMultiple analog or ‘Aux’ inputs with analogue mixing Programmable high pass filter (wind noise reduction)4 notch filters (narrowband noise suppression)On-chip PLLLow power, low voltage - 2.5V to 3.6V (digital: 1.71V to 3.6V)Package options: - 28 ball W-CSP (2.59 × 2.5 × 0.7mm, 0.4mm pitch)Mono ADC with Microphone Pre-amplifier WM8952