ISD4002-120EI

Overview

The ISD4002-120EI is a single-chip voice record/playback device from the ISD4002 series, designed for portable applications. It features 120 seconds of recording duration at an 8.0 kHz sampling frequency with a typical filter passband of 3.4 kHz. The device operates on a single 3-volt supply (2.7V to 3.3V) and utilizes non-volatile multilevel Flash memory for zero-power storage. 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. It supports SPI or Microwire interfaces and includes an on-chip oscillator, anti-aliasing filter, smoothing filter, and AutoMute feature.

Feature Summary

• Direct analog storage into non-volatile Flash memory without digitization or compression
• Integrated AutoMute feature for background noise attenuation during silence
• Microcontroller-compatible SPI or Microwire serial interface for control
• On-chip clock source with optional external clock input for precision

Applications

• Cellular phones and portable messaging devices
• Voice prompts in industrial or consumer electronics
• Multiple-message announcement systems

Procurement Notes

Verify the specific suffix 'EI' against the manufacturer's official ordering guide to confirm package type, temperature range, and revision level. Ensure the component matches the datasheet specifications for the ISD4002-120 variant. Cross-reference part numbers with authorized distributors to confirm authenticity and availability.

Selection Notes

Select this model for applications requiring approximately two minutes of high-quality voice storage with low power consumption. Consider the 8.0 kHz sampling rate for speech clarity versus longer duration variants like the ISD4002-240 if extended time is needed. Ensure the system voltage aligns with the 2.7V to 3.3V operating range.

Part Context

The ISD4002-120EI belongs to the ISD4002 ChipCorder series by Nuvoton Technology Corporation (originally Winbond). This series offers single-chip solutions for voice recording and playback using patented multilevel Flash technology. Other models in the series provide durations of 150, 180, and 240 seconds with corresponding lower sampling rates.

Replacement Considerations

Check for direct replacements within the ISD4002 series such as ISD4002-150, ISD4002-180, or ISD4002-240 if duration requirements differ. Verify pin compatibility and software register settings when substituting between different duration models.

FAQ

How does the AutoMute feature function?

The AutoMute feature attenuates background noise by 6 dB during periods of silence. It uses a peak detector circuit connected to the AM CAP pin to compare signal amplitude against an internal threshold.

What is the maximum input signal level for optimal recording quality?

In single-ended mode, the maximum input signal is 32 mVp-p. In differential mode, the maximum input signal for both ANA IN+ and ANA IN- is 16 mVp-p.

Can the device be used for playback-only applications?

Yes, the ISD4002 series is suitable for playback-only applications where messages are controlled via the SPI port. Messages can be pre-recorded and duplicated using a programmer.