ISD4004-10MP

Overview

The ISD4004-10MP is a single-chip voice record/playback solution from the Nuvoton ISD4004 ChipCorder series, designed for messaging applications. It features an ARM-compatible SPI interface and operates on a single 3V supply. The device provides 10 minutes of recording duration at a 6.4 kHz sampling frequency with a typical filter pass band of 2.7 kHz. It utilizes non-volatile multilevel Flash memory for zero-power storage, supporting 100K record cycles and 100-year retention. Key electrical parameters include a standby current of 1 µA, playback current of 15 mA, and record current of 25 mA. The component supports industrial temperature ranges (-40°C to +85°C) and includes AutoMute noise attenuation.

Feature Summary

• Direct analog storage technology preserves natural voice quality without digitization or compression algorithms.
• Integrated AutoMute feature minimizes background noise during silence periods with 6 dB attenuation.
• Fully addressable memory architecture allows handling of multiple distinct messages via SPI control.
• Non-volatile Flash memory ensures message retention without power and supports extensive re-recording.

Applications

• Cellular phone voicemail and messaging systems
• Portable electronic devices requiring low-power audio storage
• Industrial automation voice alerts and status indicators
• Security alarm system voice prompts

Procurement Notes

Verify the specific suffix 'MP' against the manufacturer's official ordering guide to confirm package type and temperature grade. Ensure the design supports the required 3V supply voltage and SPI timing constraints. Confirm that the 10-minute duration aligns with the 6.4 kHz sampling rate specifications for the target application environment.

Selection Notes

Select this model when a fixed 10-minute recording capacity is required. Compare against other series variants if different durations (8, 12, or 16 minutes) or higher sampling frequencies are needed for improved audio fidelity. Consider the external clock requirements if precise frequency stability beyond the internal oscillator tolerance is necessary for the system.

Part Context

The ISD4004 belongs to the ChipCorder series, which specializes in direct analog storage microcontrollers. This family eliminates the need for complex DSP algorithms by storing audio signals directly in Flash memory. The series offers various duration options and interfaces, positioning it as a cost-effective solution for simple voice messaging compared to digital audio codecs.

Replacement Considerations

ISD4004-08M: Offers 8 minutes duration at 8.0 kHz sampling rate. ISD4004-12M: Provides 12 minutes duration at 5.3 kHz sampling rate. ISD4004-16M: Delivers 16 minutes duration at 4.0 kHz sampling rate. All share identical pinouts and SPI interfaces.

FAQ

How does the AutoMute feature function during playback?

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, automatically adjusting attenuation based on the presence of audio signals.

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

For optimal signal quality in single-ended mode, the maximum input signal should be 32 mVp-p capacitively coupled to the ANA IN+ pin. In differential mode, the maximum input signal for both ANA IN+ and ANA IN- should be 16 mVp-p.

Can the device operate without an external clock source?

Yes, the device includes an internal oscillator centered at ±1% accuracy. However, for greater precision across temperature and voltage variations, an external clock can be applied to the XCLK pin, with specific frequencies recommended based on the selected sampling rate.