ISD4003-04MEYIR

Overview

The ISD4003-04MEYIR is a single-chip voice record/playback solution from Nuvoton’s ISD4003 series, designed for 4-minute messaging applications. It operates on a single 3V supply and utilizes multilevel Flash memory for non-volatile storage with zero-power retention. The device features an SPI interface for microcontroller control, supporting record and playback operations. 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 supports a sampling frequency of 8.0 kHz and offers an AutoMute feature for noise attenuation.

Feature Summary

• Single-chip CMOS-based solution integrating analog transceivers, filters, audio amplifier, and high-density multilevel Flash memory.
• Direct analog storage of voice signals without digitization or compression, ensuring high-quality natural reproduction.
• Microcontroller-compatible Serial Peripheral Interface (SPI) or Microwire interface for address and control functions.
• AutoMute feature provides background noise attenuation during silence periods in playback mode.

Applications

• Cellular phones and portable communication devices
• Voice messaging systems requiring 4-minute duration
• Microprocessor-based systems needing non-volatile audio storage

Procurement Notes

Verify the specific suffix MEYIR against official ordering information to confirm package type, temperature range, and lead-free status. Ensure compatibility with system voltage requirements of 2.7V to 3.3V. Confirm that the commercial temperature range of 0°C to +70°C meets application environmental needs. Check for required external components such as decoupling capacitors and input coupling capacitors as specified in the datasheet.

Selection Notes

Select this model for applications requiring exactly 4 minutes of recording time at an 8.0 kHz sampling rate. Consider the ISD4003 series variants if different durations (5, 6, or 8 minutes) or lower sampling rates are needed. Ensure the design accommodates separate analog and digital ground connections to minimize noise. Verify that the SPI interface timing constraints align with the host microcontroller's capabilities.

Part Context

The ISD4003 series includes models with varying durations: ISD4003-04M (4 min), ISD4003-05M (5 min), ISD4003-06M (6 min), and ISD4003-08M (8 min). All share the same core architecture but differ in sampling frequency and filter passband characteristics. The -EYIR suffix typically denotes specific packaging and industrial/commercial grade variations within the product line.

Replacement Considerations

No direct public substitute part numbers are listed in the provided datasheet. Designers should evaluate other ISD4003 series members for duration changes or consult Nuvoton for newer generations. Ensure any replacement maintains SPI compatibility and similar power consumption profiles.

FAQ

How does the AutoMute feature function?

The AutoMute feature minimizes background noise by attenuating the signal by 6 dB during periods of silence. It uses a peak detector circuit connected to the AM CAP pin to compare signal amplitude against an internal threshold.

What is the recommended input signal level for optimal quality?

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

Can the device be used for playback-only applications?

Yes, the ISD4003 series is ideal for playback-only applications where messages are controlled through the SPI port. Messages can be pre-recorded and duplicated via a programmer.