ISD1810X

Overview

The ISD1800 series is a single-chip voice record/playback solution utilizing patented multilevel storage technology. The ISD1810 variant provides an 8 to 16-second recording duration, determined by the external ROSC resistor value. It operates on a single +3V supply with standby current of 0.5 µA. Key electrical parameters include a sampling frequency range of 4 kHz to 8 kHz, a filter passband of 2.2 kHz, and total harmonic distortion of 1%. The device features an on-chip speaker driver capable of driving 8 Ω loads, automatic gain control, and zero-power nonvolatile message storage with 100-year retention.

Feature Summary

• Single-chip architecture integrating microphone preamplifier, AGC, anti-aliasing filter, and Class D speaker driver.
• Variable duration controlled by external resistor selection at the ROSC pin.
• Automatic power-down mode with ultra-low standby current consumption.
• Edge-activated (PLAYE) and level-activated (PLAYL) playback modes.

Applications

• Voice messaging systems
• Security alarm announcements
• Toy electronics
• Industrial equipment status indicators

Procurement Notes

Verify the specific ordering suffix 'X' indicates die form factor rather than packaged IC. Confirm the required ROSC resistor value for the target duration. Ensure the application circuit supports the 3V supply voltage and 8 ohm speaker impedance. Check datasheet revision history for any updates to electrical characteristics or pin definitions before finalizing design.

Selection Notes

Select the ISD1810 when an 8 to 16-second message capacity is required, as opposed to the ISD1806 which offers 6 to 12 seconds. Choose this component for standalone applications requiring minimal external components. Consider the die package availability if board space is constrained. Verify that the operating temperature range of 0°C to +50°C meets the environmental requirements.

Part Context

The ISD1810 belongs to the Nuvoton ISD1800 ChipCorder series, designed for simple voice recording applications. It serves as a cost-effective alternative to complex digital signal processor-based audio solutions. The series is characterized by its ease of use, requiring only a few passive components for operation. It is part of Nuvoton's broader portfolio of audio product line components.

Replacement Considerations

The ISD1806 is a compatible alternative within the same series offering shorter durations (6-12 seconds). No other direct cross-model replacements are documented in the provided datasheet. Designers should verify pin compatibility and duration requirements when substituting between ISD1806 and ISD1810 variants.