ISD4002-240SY

Overview

The ISD4002-240SY is a single-chip voice record and playback IC from Nuvoton’s ChipCorder series, designed for portable messaging applications. It features 240 seconds of recording duration at a 4.0 kHz sampling frequency with a 1.7 kHz filter passband. The device operates on a single 3V supply (2.7V to 3.3V) and includes an internal oscillator, anti-aliasing filter, smoothing filter, and AutoMute feature. Control is managed via a standard SPI interface. It utilizes high-density multilevel Flash memory for non-volatile storage, supporting 100K record cycles and 100-year retention. The component is available in a 28-lead SOIC package.

Feature Summary

• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• AutoMute functionality attenuates background noise during silence periods to improve audio clarity.
• Fully addressable memory architecture allows for multiple message handling via SPI control.
• Integrated power management supports low standby current consumption for battery-operated devices.

Applications

• Portable cellular phones and mobile communication devices
• Voice messaging systems and answering machines
• Industrial control panels requiring audible alerts
• Consumer electronics with voice feedback capabilities

Procurement Notes

Verify the specific suffix 'SY' corresponds to the 28-SOIC lead-free package and commercial temperature range when sourcing. Confirm that the required external clock frequency matches the datasheet specification for the 4.0 kHz sampling rate if higher precision than the internal oscillator is needed. Ensure the design accommodates separate analog and digital ground connections as specified in the pin configuration.

Selection Notes

Select this model specifically for applications requiring up to 240 seconds of continuous recording time. Note that the lower 4.0 kHz sampling rate results in a narrower 1.7 kHz audio bandwidth compared to shorter duration variants. Consider the trade-off between extended message length and reduced speech fidelity when choosing this part over the 120-second or 150-second versions.

Part Context

This component belongs to the ISD4002 series, which offers variable durations ranging from 120 to 240 seconds. The -240 variant provides the longest recording capacity within this family by utilizing the lowest sampling frequency. It shares the same core architecture, SPI interface, and physical package options as other members of the series, differing primarily in memory allocation and timing parameters.

Replacement Considerations

ISD4002-180SY: Offers 180 seconds duration at 5.3 kHz sampling rate. ISD4002-150SY: Offers 150 seconds duration at 6.4 kHz sampling rate. ISD4002-120SY: Offers 120 seconds duration at 8.0 kHz sampling rate. All share identical pinouts and interfaces but differ in recording time and audio bandwidth.