ISD4002-150S

Overview

The ISD4002-150S is a single-chip voice record/playback device from the ISD4002 series, designed for portable applications. It provides a 150-second recording duration at a typical sampling frequency of 6.4 kHz and a filter passband of 2.7 kHz. The device operates on a single 3-volt supply with typical operating currents of 15 mA during playback and 25 mA during recording, while standby current is typically 1 µA. It features an internal clock source, AutoMute noise attenuation, and non-volatile Flash memory storage. Control is managed via a standard SPI or Microwire serial interface.

Feature Summary

• Single-chip solution integrating analog transceivers, filters, audio amplifier, and high-density multilevel Flash memory array.
• Direct analog signal storage without digitization or compression to ensure high-quality natural voice reproduction.
• AutoMute feature automatically attenuates background noise by 6 dB during periods of silence.
• Fully addressable memory architecture allowing multiple message handling through SPI or Microwire interfaces.

Applications

• Cellular phones and other portable consumer electronics
• Microprocessor-based messaging systems requiring low power consumption
• Voice prompts in industrial or commercial equipment

Procurement Notes

Verify that the specific suffix 'S' corresponds to the TSOP package type as documented in the official datasheet ordering information. Confirm the temperature grade matches the application requirements, noting that packaged units are available in Commercial, Extended, and Industrial ranges. Ensure the external clocking configuration aligns with the required 819.2 kHz input if higher precision than the internal oscillator is necessary.

Selection Notes

Select this model when a 150-second duration at 6.4 kHz sampling rate is required. Consider the ISD4002-120EIR for longer duration needs or different package constraints. Evaluate the need for external clocking via the XCLK pin if strict frequency stability beyond the internal oscillator's tolerance is critical for the specific environment.

Part Context

The ISD4002-150S belongs to the ISD4002 ChipCorder series, which includes variants with 120, 180, and 240-second durations. These devices utilize Winbond’s patented multilevel storage technology on CMOS processes. The series is designed to minimize pin count while providing comprehensive voice recording and playback capabilities in a compact form factor suitable for battery-operated devices.

Replacement Considerations

ISD4002-120EIR

FAQ

What is the recommended external clock frequency for the ISD4002-150S?

If an external clock is used for greater precision, the recommended frequency is 819.2 kHz. Deviating from this rate may cause aliasing problems because the anti-aliasing and smoothing filters are fixed.

How does the AutoMute feature function?

The AutoMute feature minimizes background noise during playback silence by applying 6 dB of attenuation. It uses a peak detector circuit where a capacitor connected to the AM CAP pin helps sense signal amplitude and determine the mute threshold.

What is the maximum input voltage for optimal signal quality?

In single-ended mode, the maximum input signal should be 32 mVp-p. In differential-input mode, the maximum input signal for both ANA IN+ and ANA IN- pins should be 16 mVp-p.