ISD4003-04MS

Overview

The ISD4003-04MSY is a single-chip voice record and playback device from the ChipCorder series, manufactured by Nuvoton Technology Corporation. It provides 4 minutes of recording duration at an 8 kHz sampling frequency with a typical filter passband of 3.4 kHz. The component operates on a 2.7 V to 3.3 V supply and features an internal oscillator or external clock input via the XCLK pin. Control is managed through a Serial Peripheral Interface (SPI) or Microwire interface. It utilizes non-volatile multilevel Flash memory for message storage and includes an AutoMute feature for noise attenuation. The device is housed in a 28-SOIC package.

Feature Summary

• Direct analog storage of voice signals into non-volatile Flash memory without digitization or compression.
• Integrated AutoMute functionality that attenuates background noise during silence periods.
• Microcontroller-compatible SPI or Microwire serial interface for addressable multiple message handling.
• On-chip oscillator with provisions for external clocking to ensure precise sampling rates.

Applications

• Cellular phones and portable communication devices
• Security and alarm systems requiring voice prompts
• Industrial equipment with status messaging capabilities

Procurement Notes

Verify the specific suffix 'MSY' against the manufacturer's current datasheet to confirm package type and temperature range specifications. Check for product change notices regarding end-of-life status or alternative packaging options. Ensure compatibility with existing SPI protocol implementations in the target system design.

Selection Notes

Select this model for applications requiring up to 4 minutes of high-quality voice storage in a compact form factor. Consider the 8 kHz sampling rate for standard speech quality requirements. Evaluate power consumption constraints as the standby current is typically 1 µA while operating currents are higher during record and playback phases.

Part Context

The ISD4003-04MSY belongs to the ISD4003 series, which offers varying durations including 5, 6, and 8 minutes. These devices share the same core architecture and interface protocols but differ in memory capacity and resulting sampling frequencies. The series is designed for low-power, single-supply voice messaging applications.

Replacement Considerations

The I3900FYI is listed as a manufacturer-recommended substitute. Verify functional equivalence and pin compatibility before replacement. Other series members like ISD4003-05M or ISD4003-06M offer different durations but may require software adjustments due to varying sampling rates.

FAQ

How does the AutoMute feature function?

The AutoMute feature minimizes background noise during silence by applying 6 dB of attenuation when no signal is detected. A 1 µF capacitor connected to the AM CAP pin sets the threshold and attack time for this function.

What is the recommended input signal level for optimal audio quality?

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

Can the device operate with an external clock?

Yes, the ISD4003 can be clocked externally via the XCLK pin for greater precision. For the 4-minute variant, a 1024 kHz clock is required to maintain the 8 kHz sampling frequency.