ISD4004-12MSY

Overview

The ISD4004-12MSY is a single-chip voice record/playback device from the ISD4004 series, designed for 12-minute messaging applications. It operates on a single 3V supply and utilizes Nuvoton’s multilevel Flash memory to store analog speech samples directly without digitization or compression. The device features an on-chip oscillator, anti-aliasing filter, smoothing filter, AutoMute feature, and audio amplifier. 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. The sampling rate is 5.3 kHz, providing a typical filter passband of 2.3 kHz.

Feature Summary

• Direct analog storage technology preserves natural voice quality by avoiding AD/DA compression artifacts.
• Integrated SPI or Microwire serial interface minimizes pin count and simplifies microcontroller integration.
• AutoMute feature attenuates background noise during silence periods to improve audio clarity.
• Non-volatile Flash memory ensures zero-power message retention and supports extensive re-recording cycles.

Applications

• Portable consumer electronics requiring voice prompts
• Microcontroller-based systems needing low-pin-count voice control
• Industrial or commercial messaging units with long-duration requirements

Procurement Notes

Verify the specific suffix 'SY' against the manufacturer's official ordering guide to confirm package type and temperature grade. Ensure the source document explicitly lists this variant in the Ordering Information section. Cross-reference the date code and revision level (Rev1.5) with the latest datasheet updates to guarantee component authenticity and compliance with current specifications.

Selection Notes

Select the ISD4004-12MSY when a 12-minute recording duration is required alongside high-fidelity analog storage. Consider the 5.3 kHz sampling rate for speech optimization. Verify that the system voltage aligns with the 2.7V to 3.3V operating range. Ensure the application environment matches the specified commercial or industrial temperature ratings defined in the datasheet.

Part Context

The ISD4004 series represents Nuvoton's ChipCorder technology, offering a complete voice solution on a single CMOS chip. This series replaces traditional magnetic tape or complex digital codecs with direct analog storage. The ISD4004-12MSY is part of a family including 8, 10, and 16-minute variants, sharing identical control interfaces and architectural features while differing primarily in memory capacity and resulting sampling rates.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Users should consult Nuvoton's official obsolescence notices or technical support for validated alternatives if this specific variant becomes unavailable.

FAQ

How does the ISD4004-12MSY handle audio input?

The device accepts audio via ANA IN+ and ANA IN- pins, supporting both single-ended (up to 32 mVp-p) and differential (up to 16 mVp-p) input modes for optimal signal quality.

What is the function of the RAC pin?

The Row Address Clock (RAC) pin provides a timing signal corresponding to memory rows, useful for message management and tracking progress during record or playback operations.

Can the ISD4004-12MSY be used in power-sensitive applications?

Yes, it features a power-down mode with a typical standby current of 1 µA, making it suitable for battery-operated devices requiring extended idle times.