ISD4002-120PY

Overview

The ISD4002-120PY is a single-chip voice record and playback solution from Nuvoton's ChipCorder series, designed for portable messaging applications. It features 120 seconds of recording duration at an 8.0 kHz sampling frequency with a typical filter passband of 3.4 kHz. The device operates on a single 3-volt supply, drawing 15 mA during playback and 25 mA during recording, with a standby current of 1 µA. It utilizes non-volatile multilevel Flash memory for message storage, supporting 100K record cycles and 100-year retention. Control is managed via a four-wire SPI interface, and it includes an AutoMute feature for noise attenuation.

Feature Summary

• Direct analog storage in non-volatile Flash memory eliminates the need for digitization or compression algorithms.
• AutoMute functionality provides background noise attenuation during silence periods to improve audio clarity.
• Integrated microcontroller interface allows fully addressable control for handling multiple messages.

Applications

• Portable consumer electronics requiring brief voice messaging capabilities
• Industrial alarm systems utilizing direct language transmission instead of simple tones
• Unattended equipment monitoring devices needing automated voice alerts

Procurement Notes

Verify the specific package suffix against the datasheet ordering information to ensure correct physical dimensions and pinout compatibility. Confirm that the industrial temperature range variant meets the environmental requirements if operating outside commercial limits. Check for any recent product change notices regarding manufacturing updates or component substitutions.

Selection Notes

Select this model when a fixed 120-second duration at 8.0 kHz sampling rate is required for optimal voice quality. Consider alternative series members like the ISD4002-150 or ISD4002-180 if longer recording times are needed, accepting lower sampling frequencies. Ensure the host system supports the necessary SPI protocol and can provide the required power supply decoupling for stable operation.

Part Context

This component belongs to the ISD4002 ChipCorder series, which offers single-chip solutions ranging from 120 to 240 seconds of duration. The series is characterized by its use of patented multilevel storage technology for high-fidelity analog voice reproduction without external digital signal processing.

Replacement Considerations

ISD4002-120SY is a documented substitute offering identical functional specifications but housed in a 28-SOIC package instead of the PDIP configuration.

FAQ

How does the AutoMute feature function?

The AutoMute feature minimizes background noise by attenuating the output signal by 6 dB during periods of silence. It uses an internal peak detector connected to the AM CAP pin to compare signal amplitude against a 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+. In differential mode, the maximum input signal should be 16 mVp-p.

Can the device operate without an external clock?

Yes, the ISD4002-120PY comes factory-configured with an internal oscillator centered at ±1% accuracy. However, for greater precision across temperature ranges, an external clock can be applied to the XCLK pin.