ISD3800FYIR

Overview

The ISD3800FYIR is a digital ChipCorder featuring digital compression, comprehensive memory management, and integrated analog/digital audio signal paths. It utilizes serial flash memory to provide non-volatile audio playback for a two-chip solution. The device supports I2S or SPI interfaces for digital audio data input, with sample rates of 32, 44.1, or 48 kHz via I2S. It includes inbuilt analog audio inputs, an analog audio line driver, and speaker driver outputs. Key electrical parameters include an operating voltage range of 2.7V to 5.5V, a typical standby current of 1µA, and an SNR of 80dB. The Class-D PWM output delivers 1W at 5.5V into a 4Ω load.

Feature Summary

• Supports external serial flash memory up to 128Mbit capacity with an inbuilt 3V voltage regulator.
• Features fast digital programming capabilities with rates up to 1Mbits/second.
• Provides multiple output options including Aux-out, Class-AB BTL, and Class-D PWM speaker drivers.
• Includes seven available sampling frequencies scaling from master rates like 32kHz.

Applications

• Voice prompts and announcements
• Digital voice recording and playback systems
• Interactive electronic devices requiring non-volatile audio storage

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and temperature grade. Ensure compatibility with required external flash memory families such as Winbond 25X or MXIC 25P series. Confirm that the selected component meets the industrial temperature range requirements of -40°C to 85°C for the intended application environment.

Selection Notes

Select this component when a two-chip solution with high-quality digital audio compression is required. Consider the ISD3800 for designs needing flexible input via I2S or SPI alongside analog Aux-in capabilities. Evaluate the need for Class-D or Class-AB output stages based on speaker impedance and power requirements. Ensure the system design accommodates the necessary external flash memory and decoupling capacitors specified in the datasheet.

Part Context

The ISD3800 belongs to the Nuvoton ISD ChipCorder series, designed for multi-message record and playback applications. It integrates advanced compression algorithms and memory management to simplify system design. The series targets consumer electronics and industrial applications requiring reliable, non-volatile voice storage with high signal-to-noise ratios and low power consumption.

Replacement Considerations

Check for pin-compatible alternatives within the ISD3800 family or other ISD ChipCorder models if different package options are needed. Verify that any substitute supports the same external flash memory interfaces and voltage regulators. Ensure the replacement maintains the required audio performance metrics and operating temperature range.

FAQ

What types of digital compression algorithms does the ISD3800 support?

The ISD3800 supports µ-Law, Differential µ-Law, PCM, Enhanced ADPCM, and variable-bit-rate optimized compression algorithms for pre-recorded voice prompts.

Can the ISD3800 operate without an external crystal?

Yes, the ISD3800 features an internal oscillator with ±1% deviation. It can also use an external resistor for ±2% deviation or accept an external clock input.

How is the gain for the auxiliary analog input configured?

The gain for the Aux-in pin is fixed and configured via SPI commands, offering programmable gain steps of 3 dB.