ISD4003-04MEYI

Overview

The ISD4003-04MEYI is a single-chip voice record/playback device from the ISD4003 series, designed for portable applications. It supports a recording duration of 4 minutes at an 8.0 kHz sampling frequency with a typical filter pass band of 3.4 kHz. The device operates on a single 3-volt supply (2.7V to 3.3V) and features low-power consumption, with typical operating currents of 15 mA during playback and 25 mA during recording. Standby current is typically 1 µA. It utilizes non-volatile multilevel Flash memory for message storage, offering 100-year retention and 100K record cycles. Control is managed via a Serial Peripheral Interface (SPI).

Feature Summary

• Single-chip solution integrating analog transceivers, filters, audio amplifier, and high-density Flash memory.
• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• AutoMute feature minimizes background noise attenuation during silence periods in playback mode.
• Fully addressable memory architecture allows handling of multiple messages through SPI control.

Applications

• Cellular phones and other portable communication devices requiring voice messaging.
• Microprocessor-based systems needing simple voice recording and playback capabilities.
• Portable products utilizing single-chip solutions to minimize component count and power usage.

Procurement Notes

Verify the specific ordering suffix MEYI against official Nuvoton documentation to confirm package type and temperature range. Ensure compatibility with system voltage requirements of 2.7V to 3.3V. Confirm that the 4-minute duration aligns with application needs. Check for lead-free compliance status as specified in the datasheet revision.

Selection Notes

Select this model when a 4-minute recording duration at 8.0 kHz sampling rate is required. Consider the industrial temperature range (-40°C to +85°C) if operating in harsh environments. Evaluate the SPI interface requirements for microcontroller integration. Compare with other series variants (05M, 06M, 08M) if longer durations are needed, noting the trade-off with sampling frequency.

Part Context

The ISD4003 series belongs to Nuvoton's ChipCorder family, which uses patented multilevel storage technology. This series provides high-quality voice reproduction by storing analog speech samples directly into Flash memory. The ISD4003-04MEYI is part of this lineup, offering a balance between audio quality and recording time for portable electronic devices.

Replacement Considerations

ISD4003-05MEYI offers 5 minutes duration at 6.4 kHz. ISD4003-06MEYI provides 6 minutes at 5.3 kHz. ISD4003-08MEYI supports 8 minutes at 4.0 kHz. These alternatives maintain similar interface and power characteristics but differ in sampling rate and duration.

FAQ

What is the maximum input signal level for optimal recording quality?

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

How does the AutoMute feature function?

The AutoMute feature attenuates background noise by 6 dB during silence periods in playback mode. It uses a peak detector circuit where a capacitor connected to the AM CAP pin helps determine the trip point based on signal amplitude.

Can the internal clock be replaced with an external clock?

Yes, for greater precision, an external clock can be applied to the XCLK pin. For the ISD4003-04M variant, a 1024 kHz clock is recommended to maintain the 8.0 kHz sampling frequency.