ISD1806X

Overview

The ISD1806X is a single-chip, single-message record/playback solution from Nuvoton’s ISD1800 series. It operates on a single +3V supply with a voltage range of +2.7V to +4.5V. The device provides user-selectable durations between 6 and 12 seconds, determined by an external resistor connected to the ROSC pin. Key electrical parameters include a typical standby current of 0.5 µA, a speaker output power of 24.4 mW into an 8 Ω load, and a total harmonic distortion of 1% at 1 kHz. The sampling frequency ranges from 4 kHz to 8 kHz based on the selected duration.

Feature Summary

• Patented multilevel storage technology enables high-quality, natural voice reproduction without synthetic effects.
• Zero-power message storage in nonvolatile memory eliminates the need for battery backup circuits.
• Automatic power-down mode reduces standby current consumption to typically 0.5 µA after operation.
• On-chip microphone preamplifier with Automatic Gain Control (AGC) compensates for varying input levels.

Applications

• Single-message voice prompts in consumer electronics
• Security alarm systems requiring simple push-button activation
• Industrial control panels with voice feedback
• Educational toys and novelty items

Procurement Notes

Verify the specific ordering suffix 'X' indicates the die form factor rather than a packaged component. Confirm that the design accommodates bare die handling requirements, including proper bonding layout and thermal management. Ensure the application circuit strictly adheres to the absolute maximum ratings provided in the datasheet to prevent device damage during procurement and integration phases.

Selection Notes

Select the ISD1806X when a single-message capability with variable duration between 6 and 12 seconds is required. Choose this model over the ISD1810 if shorter recording times are sufficient for the application. Consider the die package availability if board space is limited and surface mounting of bare dies is feasible. Verify that the external resistor value aligns with the desired sample rate and playback duration specifications.

Part Context

The ISD1806X belongs to the ISD1800 ChipCorder series, which offers single-chip solutions for voice recording and playback. This series utilizes patented multilevel storage technology for solid-state voice reproduction. The ISD1806X specifically provides shorter duration options compared to the ISD1810 variant, making it suitable for applications requiring concise audio messages.

Replacement Considerations

The ISD1810 serves as a functional alternative within the same series, offering longer durations of 8 to 16 seconds. Designers must account for differences in timing characteristics and ensure that the external resistor values are adjusted accordingly to match the desired performance metrics of the replacement part.