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The Nuvoton ISD1730EY is a single-chip voice recording and playback device from the ISD1700 series, housed in a 28-lead SOIC package. It supports message durations up to 40 seconds at 12 kHz sampling frequency or 60 seconds at 4 kHz. Operating voltage ranges from 2.4 V to 5.5 V with standby current of 1 µA. The chip features an integrated microphone preamplifier with AGC, PWM Class D speaker driver for 8 Ω loads, and SPI interface for microcontroller control.
Verify the specific ordering suffix against the manufacturer's official datasheet to confirm package type and temperature grade. Ensure the component matches the required sampling frequency configuration via the external oscillator resistor. Cross-reference the part number with authorized distributors to confirm availability and authenticity before procurement.
Select this model when a fixed message duration of approximately 40 seconds at high quality or 60 seconds at lower quality is required. Choose the SOIC package for surface-mount assembly requirements. Consider the SPI mode if dynamic address management or remote control is necessary compared to simple push-button applications.
The ISD1730 belongs to the ISD1700 ChipCorder series, which utilizes Multi-Level Storage technology for direct audio storage in Flash memory. This series offers various duration options, with the ISD1730 providing a mid-range capacity suitable for moderate-length voice messages without requiring external memory components.
ISD1760EY: Offers longer message duration (up to 80s at 12kHz) with identical pinout and functionality. ISD17120EY: Provides extended duration (up to 240s at 4kHz) while maintaining the same interface and package options within the ISD1700 series.