An analog record, playback, and processing system on a chip for mobile communications devices

We present a low-power chip for nonvolatile storage and conditioning of voi ceband analog audio signals and nonvolatile storage for use in mobile commu nication devices. The system allows for direct interface to acoustic transd ucer elements and provides signal conditioning to gain adjust, multiples, f ilter, and mis two independent signals. The system can record these process ed signals as analog samples in a nonvolatile flash EEPROM array for later retrieval, Together with an integrated signal path, the system can store up to 8 minutes of audio signal, Control of the system is achieved via a seri al interface, which is used to configure and control the device. All necess ary components of the system are provided on chip including analog processi ng elements, nonvolatile storage, high voltage, and reference generation.