ISD3800FYI

Overview

The ISD3800FYI is a digital ChipCorder voice recording and playback IC from Nuvoton Technology Corporation, housed in a 48-lead LQFP package. It operates on a supply voltage of 2.7V to 5.5V with a typical standby current of 1µA. The device supports external serial flash memory up to 128Mbit, enabling approximately 64 minutes of playback at 8kHz/4-bit ADPCM. Key electrical parameters include an internal oscillator frequency of 2.048MHz (±1% deviation), an analog-to-digital signal-to-noise ratio of 80dB, and Class-D PWM speaker driver output power of 1W into a 4Ω load at 5.5V. Operating temperature range is -40°C to +85°C.

Feature Summary

• Supports I²S digital audio interface for sample rates of 32, 44.1, or 48 kHz, alongside SPI interface capabilities.
• Integrates Class-D PWM and Class-AB BTL speaker drivers capable of delivering 1W output power.
• Features comprehensive memory management with support for various flash families and high-speed programming rates up to 1Mbits/second.
• Includes built-in 3V voltage regulator to power external flash memory and multiple compression algorithms.

Applications

• Industrial voice prompts and announcements
• Consumer electronic devices requiring non-volatile audio storage
• Automotive infotainment systems
• Smart home appliances with voice feedback

Procurement Notes

Verify the specific suffix 'FYI' corresponds to the 48L-LQFP package and industrial temperature grade (-40°C to +85°C) as defined in the ordering information section of the datasheet. Confirm that the required external serial flash memory is compatible with the supported JEDEC ID list provided in the features section. Ensure design compliance with absolute maximum ratings for all supply voltages.

Selection Notes

Select this component when a two-chip solution using external flash is preferred over single-chip integrated memory designs. Consider the ISD3800 for applications requiring high sampling frequencies via I²S input or specific Class-D/Class-AB output configurations. Evaluate the need for macro script execution and index-based playback commands against simpler button-controlled alternatives like the ISD1700 series.

Part Context

The ISD3800 belongs to the ISD3800 Series within Nuvoton's ChipCorder product line. It is designed as a highly integrated single-chip solution for voice and audio applications, utilizing digital compression and memory management. The FYI suffix indicates the specific package type and temperature rating available for this part number.

Replacement Considerations

Publicly confirmed substitute part numbers are not explicitly listed in the provided datasheet text. Designers should consult Nuvoton Technology Corporation directly for recommended replacements or newer generations within the ChipCorder portfolio.

FAQ

What is the maximum playback duration supported by the ISD3800?

The addressing ability supports up to 128Mbit of external flash memory, which provides approximately 64 minutes of playback time based on 8kHz/4-bit ADPCM encoding.

Can the ISD3800 accept digital audio input directly?

Yes, it accepts digital audio data via I²S or SPI interfaces. When I²S input is selected, it replaces analog audio inputs and supports sample rates of 32, 44.1, or 48 kHz.

What types of speaker outputs does the ISD3800 provide?

It provides three output types: Aux-out (analog single-ended voltage), Class-AB BTL (analog differential voltage), and Class-D PWM. Both Class-AB BTL and Class-D PWM can directly drive a speaker.