ISD4004-08MP

Overview

The ISD4004-08MP is a single-chip voice record/playback device from the ISD ChipCorder series, designed for portable applications. It operates on a single 3V supply and utilizes direct analog storage technology to preserve high-quality audio without digital compression. The specific -08M variant supports an 8-minute recording duration at an 8.0 kHz sampling frequency with a typical filter passband of 3.4 kHz. Key electrical parameters include a typical playback current of 15 mA and standby current of 1 µA. It features a 28-pin SOIC package and communicates via SPI or Microwire interfaces.

Feature Summary

• Direct analog storage preserves natural voice quality without A/D conversion
• Integrated AutoMute feature attenuates background noise during silence
• Non-volatile Flash memory retains data for up to 100 years
• Supports multiple message management through addressable memory rows

Applications

• Cellular phones and mobile devices
• Portable consumer electronics
• Voice prompting systems
• Industrial control announcements

Procurement Notes

Verify the exact ordering suffix against the manufacturer's latest datasheet revision. Confirm that the 'MP' designation corresponds to the specified 28-lead Plastic Small Outline IC (SOIC) package type. Ensure the component meets the required commercial temperature range specifications for your intended application environment.

Selection Notes

Select this model when an 8-minute maximum recording time is sufficient for the application. Choose the industrial grade variant if operation below 0°C is required. Consider external clocking via the XCLK pin if precise sampling frequency stability is critical over wide temperature variations.

Part Context

This component belongs to the ISD4004 series, which offers varying durations including 10, 12, and 16 minutes. The series shares identical pinouts and interface protocols across variants, differing primarily in sampling rates and memory allocation. It represents a legacy solution for low-power voice messaging compared to modern digital audio processors.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify compatibility with alternative voice chips based on pinout and SPI protocol requirements.

FAQ

How does the ISD4004 handle audio input?

It accepts analog signals directly into the ANA IN+ and ANA IN- pins, supporting both single-ended and differential input modes without requiring external analog-to-digital converters.

What is the function of the RAC pin?

The Row Address Clock (RAC) pin provides a timing signal corresponding to memory row boundaries, facilitating message management and address pointer updates during recording or playback.

Can the internal oscillator be bypassed?

Yes, an external clock signal can be applied to the XCLK pin to achieve higher precision sampling frequencies, though the internal oscillator is factory-calibrated for standard operation.