ISD4002-240ED

Overview

The ISD4002-240ED is a single-chip voice record/playback device from the Nuvoton ISD4002 series, designed for portable messaging applications. It provides a 240-second recording duration at a 4.0 kHz sampling frequency with a typical filter passband of 1.7 kHz. The component operates on a single 3-volt supply and features an internal Flash memory array for non-volatile storage. Control is managed via a Serial Peripheral Interface (SPI) or Microwire interface. Key electrical parameters include a typical operating current of 15 mA during playback and 25 mA during recording, with a standby current of 1 µA.

Feature Summary

• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• Integrated AutoMute feature attenuates background noise by 6 dB during periods of silence.
• Fully addressable memory architecture supports multiple message management through SPI control.
• On-chip oscillator eliminates the need for external clock components in standard configurations.

Applications

• Cellular phone voicemail and messaging systems
• Portable electronic devices requiring low-power audio recording
• Industrial equipment with speech feedback requirements

Procurement Notes

Verify that the specific suffix 'ED' corresponds to the Industrial temperature range (-40°C to +85°C) as defined in the official datasheet. Confirm the package type matches the required PCB footprint, typically TSOP or SOIC for this series. Ensure the ordering code aligns with the 240-second duration variant to avoid functional mismatches in timing-critical designs.

Selection Notes

Select the ISD4002-240ED when extended temperature operation is required alongside maximum recording time within the series. The 4.0 kHz sampling rate offers the longest duration but reduced audio fidelity compared to higher-rate variants. Designers must account for the fixed anti-aliasing filter characteristics associated with this specific sampling frequency.

Part Context

This component belongs to the ISD4002 ChipCorder series, which utilizes Winbond's multilevel Flash memory technology. The series includes variants with 120, 150, 180, and 240-second durations. The ISD4002-240ED represents the industrial-grade version of the 240-second model, distinguished by its wider operating temperature range suitable for harsh environments.

Replacement Considerations

ISD4002-240EIR serves as a commercial-grade alternative with identical electrical performance but a narrower temperature range (0°C to +70°C). Other series members like ISD4002-120ED offer shorter durations but higher sampling frequencies for improved audio quality.