ISD4002-240EY

Overview

The ISD4002-240EY is a single-chip voice record and playback IC from the ISD4002 ChipCorder series by Nuvoton Technology Corporation. It provides 240 seconds of recording duration at a sampling frequency of 4.0 kHz with a typical filter pass band of 1.7 kHz. The device operates on a single 3-volt supply (2.7 V to 3.3 V) and features low-power consumption, including a standby current of 1 µA. It utilizes an SPI interface for control and includes an on-chip oscillator, anti-aliasing filter, smoothing filter, AutoMute feature, audio amplifier, and high-density multilevel Flash memory array. The component is available in a 28-SOIC package.

Feature Summary

• Direct analog storage into non-volatile Flash memory without digitization or compression.
• AutoMute feature minimizes background noise during silence periods.
• Fully addressable multiple message handling via SPI interface.
• On-chip clock source with optional external clock input for precision.

Applications

• Cellular phones
• Portable products
• Microprocessor-based messaging systems

Procurement Notes

Verify the specific suffix 'EY' against the manufacturer's official ordering information to confirm package type and temperature range specifications. Ensure compatibility with the required 2.7 V to 3.3 V supply voltage and SPI interface timing parameters for your system design.

Selection Notes

Select this model for applications requiring up to 240 seconds of message duration. Note that the 4.0 kHz sampling rate results in a narrower filter pass band compared to higher-speed variants. Consider the industrial temperature range if operation outside the commercial range is required.

Part Context

This part belongs to the ISD4002 ChipCorder series, which offers durations ranging from 120 to 240 seconds. The series shares common architectural features such as the multilevel Flash memory technology and SPI control interface, differing primarily in sampling rates and resulting audio quality/duration trade-offs.

Replacement Considerations

Other models in the ISD4002 series, such as ISD4002-120, ISD4002-150, and ISD4002-180, are pin-compatible alternatives offering different recording durations and sampling frequencies. Verify electrical characteristics and timing requirements when substituting.

FAQ

What is the recommended external clock frequency for the ISD4002-240?

For the ISD4002-240 variant operating at a 4.0 kHz sampling frequency, the recommended external clock input frequency via the XCLK pin is 512 kHz.

How does the AutoMute feature function?

The AutoMute feature attenuates background noise 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 maximum input signal level for optimal quality?

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