Nuvoton’s ISD18B12 ChipCorder is a new single-chip single-message record and playback device with a special TryMe feature. The user-selectable duration is from 6 to 12 seconds, with wide operating voltage ranging from 2.4V to 5.5V. Its sampling frequency, ranging from 4kHz to 8kHz, is externally controlled via resistor at Rosc pin. This device also includes microphone amplifier, anti-aliasing filter, multilevel storage array, smoothing filter and speaker amplifier. Two external resistors are used to adjust the microphone amplifier gain for the incoming signal. Thus, a minimum record/playback subsystem can be configured with a microphone, a speaker, several passive components, two push buttons, and a power source.

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