ISD4002-120EYI

Overview

The ISD4002-120EYI is a single-chip voice record and playback solution from the ISD4002 ChipCorder series, designed for portable messaging 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 3V supply (2.7V to 3.3V) and includes an on-chip oscillator, anti-aliasing filter, smoothing filter, AutoMute feature, audio amplifier, and high-density multilevel Flash memory. Control is managed via a Serial Peripheral Interface (SPI).

Feature Summary

• Single-chip architecture integrating analog transceivers, non-volatile multilevel storage array, and power conditioning.
• AutoMute feature provides background noise attenuation during silence periods.
• Direct analog storage without digitization or compression for high-quality voice reproduction.
• Fully addressable message handling via SPI interface with interrupt support.

Applications

• Cellular phones and portable consumer electronics
• Microcontroller-based system messaging
• Multiple message playback systems

Procurement Notes

Verify the specific suffix 'EYI' against official Nuvoton documentation to confirm package type and temperature range. Datasheet lists SOIC and PDIP packages with commercial and industrial temperature options. Ensure ordering matches the required environmental specifications and physical footprint for your design.

Selection Notes

Select this model for applications requiring exactly 120 seconds of voice storage. Choose based on the required sampling rate; higher rates improve quality but reduce duration. Consider the industrial temperature range if operating outside 0°C to +70°C. Verify SPI compatibility with the host microcontroller.

Part Context

The ISD4002-120EYI belongs to the ISD4002 ChipCorder series, which offers durations of 120, 150, 180, and 240 seconds. This series utilizes patented multilevel storage technology in CMOS process, allowing direct analog signal storage in Flash memory cells for zero-power retention.

Replacement Considerations

Other models in the ISD4002 series (ISD4002-150, -180, -240) offer different durations and sampling rates. Check datasheet Table 1 for specific electrical differences. No direct cross-model substitutes are officially listed as pin-compatible replacements with identical functionality.

FAQ

How does the AutoMute feature function?

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

What is the recommended input signal level for optimal quality?

For single-ended mode, a maximum of 32 mVp-p should be capacitively coupled to ANA IN+. For differential mode, the maximum input signal at both ANA IN+ and ANA IN- should be 16 mVp-p.

Can the device be clocked externally?

Yes, an external clock can be applied to the XCLK pin for greater precision. For the ISD4002-120, a 1024 kHz clock is required to maintain the 8.0 kHz sampling frequency.