AD1806JS

Overview

The AD1806JS is a high-performance stereo audio analog-to-digital converter manufactured by Analog Devices Inc. It integrates two differential sigma-delta modulators and on-chip digital decimation filters to convert analog audio signals into 20-bit data. The device supports sampling rates up to 48 kHz with a dynamic range of 96 dB and total harmonic distortion plus noise of -95 dB. It operates from a single 5 V supply, features a serial interface for data output, and includes a built-in clock generator. The component is housed in a 40-pin plastic DIP package and is designed for professional audio applications requiring high fidelity and low power consumption.

Feature Summary

• Integrates dual sigma-delta modulators with digital decimation filters for direct audio digitization
• Provides high-resolution 20-bit data output with low distortion characteristics
• Includes an internal clock generator to simplify system design
• Supports serial data interface compatible with standard microprocessors

Applications

• Professional audio recording equipment
• High-fidelity CD players and disc drives
• Digital audio workstations and mixing consoles
• Broadcasting studio monitoring systems

Procurement Notes

Verify the specific suffix JS indicates the plastic DIP package variant when sourcing replacements. Confirm that the component meets the required voltage and interface specifications for the target circuit. Check for availability of obsolete or end-of-life status as this model may be discontinued. Ensure compatibility with existing clock and data lines before integration.

Selection Notes

Select this component for applications requiring stereo input conversion with integrated filtering. Compare against newer sigma-delta ADCs if higher resolution or lower power is needed. Verify that the 48 kHz maximum sampling rate meets the bandwidth requirements of the audio signal chain. Ensure the 5 V supply voltage aligns with the system power rails.

Part Context

The AD1806 belongs to a family of audio ADCs designed for high-quality sound reproduction. It was widely used in early digital audio hardware before the prevalence of multi-bit delta-sigma converters. The JS suffix typically denotes the industrial temperature range and plastic packaging option within the product line.

Replacement Considerations

Direct pin-compatible replacements are limited due to the age of the component. Consider modern stereo ADCs with similar interfaces such as the AD1865 or AD1867 series. Verify that alternative devices support the same 20-bit resolution and 48 kHz sampling rate. Check for any necessary level shifting or clock configuration changes.