ISD4004-08MEYI

Overview

The ISD4004-08MEYI is a single-chip voice record/playback solution from the ISD4004 ChipCorder series, designed for 8-minute messaging applications. It operates on a single 3V supply and features an on-chip oscillator, anti-aliasing filter, smoothing filter, AutoMute feature, audio amplifier, and high-density multilevel Flash memory array. The device supports SPI or Microwire serial interfaces for microcontroller integration. 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 offers 100K record cycles and 100-year message retention.

Feature Summary

• Single-chip CMOS-based solution integrating analog transceivers, filters, and non-volatile multilevel storage array for direct analog speech sample storage without digitization or compression.
• AutoMute feature provides background noise attenuation by sensing signal amplitude and applying 6 dB attenuation during silence periods.
• Fully addressable memory architecture allowing multiple messages to be handled via SPI interface with interrupt capabilities for overflow and end-of-message detection.
• Supports Message Cueing mode for rapid skipping through messages and includes power-down functionality to minimize energy consumption.

Applications

• Cellular phones and portable communication devices requiring high-quality voice messaging
• Industrial control systems needing reliable non-volatile voice alerts
• Consumer products utilizing single-chip voice recording and playback

Procurement Notes

Verify the specific suffix 'EYI' against the manufacturer's official ordering information to confirm package type and temperature grade. Ensure compatibility with the required sampling rate and voltage levels before procurement. Cross-reference the datasheet revision date to confirm technical specifications remain unchanged.

Selection Notes

Select this component for applications requiring up to 8 minutes of continuous voice recording and playback at 8.0 kHz sampling frequency. Consider the industrial temperature range if operation exceeds commercial limits. Evaluate the SPI interface requirements and ensure the host microcontroller supports the necessary clock speeds and protocol timing.

Part Context

The ISD4004-08MEYI belongs to the ISD4004 series, which includes variants with different durations such as 10, 12, and 16 minutes. These parts share the same core architecture and interface protocols but differ in sampling rates and memory allocation to achieve varying recording times.

Replacement Considerations

Direct substitutes within the ISD4004 series include ISD4004-10M, ISD4004-12M, and ISD4004-16M, which offer longer recording durations. Verify pin compatibility and software command set alignment when considering these alternatives.

FAQ

How does the AutoMute feature function?

The AutoMute feature minimizes background noise during playback by using an internal peak detector. It applies 6 dB of attenuation when no signal is detected (silence) and automatically sets attenuation to 0 dB for large signals.

What is the purpose of the RAC pin?

The Row Address Clock (RAC) pin provides a signal indicating the end of a memory row. It can be used for message management techniques, such as triggering address updates or detecting the end of a message segment.

Can the ISD4004-08MEYI operate with an external clock?

Yes, while it has an internal oscillator, an external clock can be applied to the XCLK pin for greater precision. For the 8.0 kHz sampling rate, a 1024 kHz external clock is recommended.