WM8952 Datasheet, PDF (1/72 Pages) Wolfson Microelectronics plc – Mono ADC with Microphone Pre-amplifier

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WM8952
Mono ADC with Microphone Pre-amplifier
DESCRIPTION
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.
BLOCK DIAGRAM
FEATURES
• Mono ADC:
• Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz
• ADC 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 path
• Low-noise bias supplied for electret microphones
• Multiple analog or ‘Aux’ inputs with analogue mixing
OTHER FEATURES
• Programmable high pass filter (wind noise reduction)
• 4 notch filters (narrowband noise suppression)
• On-chip PLL
• Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
• 28 ball W-CSP (2.59 × 2.5 × 0.7mm, 0.4mm pitch) Package
APPLICATIONS
• Headsets
• Wireless microphones
• General purpose mono audio ADC
WOLFSON MICROELECTRONICS plc
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Pre Production, Rev 3.1, June 2011
Copyright ©2011 Wolfson Microelectronics plc