ISD5008E

Overview

The ISD5008E is a single-chip voice record and playback device by Nuvoton Technology Corporation, offering 4 to 8 minutes of storage duration. It operates on a single +3V supply with typical operating currents of 15 mA during playback and 25 mA during recording, while standby current is 1 µA. The device supports sample rates of 8.0 kHz, 6.4 kHz, 5.3 kHz, and 4.0 kHz, corresponding to durations of 4, 5, 6, and 8 minutes respectively. It features an SPI interface for control and includes integrated analog components such as AGC, speaker driver (23 mW into 8 Ω), and volume control.

Feature Summary

• Fully integrated single-chip solution with on-chip nonvolatile memory for zero-power message storage.
• Integrated automatic gain control (AGC), summing amplifiers, and speaker driver for simplified circuit design.
• Supports one-way and two-way full-duplex conversation recording and playback via microcontroller SPI interface.
• Configurable sample rates allow optimization of voice quality versus storage duration.

Applications

• Digital cellular phones (GSM, CDMA, TDMA, PDC, PHS)
• Automotive communications and car kits
• GPS and navigation systems
• Portable communication products

Procurement Notes

Verify the specific suffix 'E' against the manufacturer's official ordering information to confirm temperature range and packaging details. Ensure compatibility with the required voltage levels and SPI protocol for your host microcontroller. Check for any lead time variations or end-of-life notices directly from Nuvoton or authorized distributors before finalizing procurement plans.

Selection Notes

Select the ISD5008E when a compact, low-power voice storage solution is needed for mobile or automotive applications. Consider the trade-off between sampling rate and duration based on voice quality requirements. Ensure the host system can provide the necessary SPI interface and that the power supply meets the 3V requirement with adequate decoupling for analog and digital sections.

Part Context

The ISD5008 series belongs to Nuvoton's ChipCorder family, utilizing patented multilevel storage technology to store voice signals directly in solid-state memory without compression. This approach preserves natural sound quality compared to digitized solutions. The device is designed for seamless integration into microprocessor-based systems, eliminating the need for external codecs or complex audio processing circuits.

Replacement Considerations

Check Nuvoton's official documentation for direct pin-to-pin replacements within the ISD500x series, such as variants with different package options or temperature ratings. Verify that any substitute part maintains the same SPI command set and electrical characteristics to ensure functional compatibility without hardware redesign.

FAQ

How is the voice data stored in the ISD5008?

Voice and audio signals are stored directly into on-chip nonvolatile memory cells in their natural, uncompressed form using ISD’s patented multilevel storage technology.

What is the maximum power output of the integrated speaker driver?

The integrated speaker driver can deliver up to 23 mW into an 8-ohm load.

Can the ISD5008 support full-duplex recording?

Yes, the device supports one-way or two-way (full duplex) conversation recording through its internal summing amplifiers.