ISD1790SYIR

Overview

The ISD1790SYIR is a single-chip voice record and playback device from Nuvoton’s ISD1700 ChipCorder series, housed in a 28-pin SOIC package. It utilizes Multi-Level Storage (MLS) technology for non-volatile message storage, allowing user-selectable recording durations ranging from 26 to 120 seconds. The sampling frequency is adjustable between 4 kHz and 12 kHz via an external resistor, balancing duration and audio quality. Operating voltage spans 2.4 V to 5.5 V, supporting both standalone push-button operation and microcontroller control via SPI interface.

Feature Summary

• Proprietary MLS technology enables automatic address management for multiple messages without complex software overhead.
• Integrated microphone preamplifier with Automatic Gain Control (AGC) and auxiliary analog input for flexible audio interfacing.
• Built-in Pulse Width Modulation (PWM) Class D speaker driver capable of directly driving speakers or buzzers.

Applications

• Standalone electronic messaging systems requiring simple push-button operation.
• Voice-enabled consumer electronics and appliances.
• Security and alarm system voice prompts.
• Industrial equipment status announcements.

Procurement Notes

Verify the specific suffix 'IR' against official Nuvoton documentation to confirm temperature range and tape-and-reel packaging specifications. Ensure compatibility with existing SPI interfaces if microcontroller mode is utilized. Cross-reference the 28-SOIC pinout with current design schematics to prevent integration errors during PCB layout.

Selection Notes

Select this component when application requirements demand extended recording times up to 120 seconds with variable sampling rates. The ISD1790 is suitable for designs needing integrated audio processing, including AGC and PWM output, reducing external component count. Consider the operating voltage range and interface mode (standalone vs. SPI) based on system power constraints and complexity.

Part Context

The ISD1790 belongs to the ISD1700 family of fully integrated voice record/playback ICs. This series is characterized by its ability to manage multiple messages autonomously using patented MLS technology. It serves as a cost-effective solution for applications requiring high-quality voice interaction without the need for external memory or complex digital signal processors.

Replacement Considerations

Check Nuvoton datasheets for other ISD17xx variants with different duration or package options. Verify functional compatibility regarding pinouts and SPI protocols before substituting with similar voice recorders from other manufacturers.