AD2S80AUD

Overview

The AD2S80AUD is a monolithic resolver-to-digital converter manufactured on a BiMOS II process, housed in a 40-lead ceramic DIP package. It provides user-selectable resolution of 10, 12, 14, or 16 bits via SC1 and SC2 pins. The device operates with ±12 V analog supplies and +5 V logic supply, supporting reference frequencies from 50 Hz to 20 kHz. Angular accuracy is specified at ±8 arc minutes for the industrial grade. Maximum tracking rates vary by resolution: 1040 rps at 10-bit, down to 16.25 rps at 16-bit. It features a parallel natural binary output, an analog velocity signal, and ESD protection rated at 2,000 V minimum.

Feature Summary

• User-selectable resolution (10, 12, 14, or 16 bits) via SC1/SC2 control pins
• Ratiometric tracking conversion ensuring high noise immunity and tolerance to lead length
• Analog velocity output proportional to rotation speed, replacing tachogenerators
• Industrial temperature range operation (-40°C to +85°C)
• ESD Class 2 protection (2,000 V min)

Applications

• DC Brushless and AC Motor Control
• Process Control Systems
• Numerical Control of Machine Tools
• Robotics Axis Control
• Military Servo Control

Procurement Notes

Verify the suffix 'UD' corresponds to the extended temperature grade (-55°C to +125°C) as defined in the manufacturer's ordering information section. Confirm package type matches the 40-lead DIP requirement. Ensure power supply polarity is strictly maintained (+VS positive, -VS negative) to prevent damage. Check for MIL-STD-883B qualification if military-grade reliability is required, noting that standard commercial parts may differ.

Selection Notes

Select external components R4 and R6 based on the chosen resolution and desired maximum tracking rate. For 16-bit resolution, ensure the system bandwidth does not exceed 1/7.5 of the reference frequency. Use low-cost preferred value resistors and capacitors with 5% tolerance. Connect SIN/COS signals using individually screened twisted pairs joined at the SIGNAL GROUND pin to minimize coupling. Decouple power lines with 100 nF ceramic and 10 µF tantalum capacitors adjacent to the device.

Part Context

The AD2S80A series includes variants such as AD2S80AJD (commercial), AD2S80ABD (industrial), and AD2S80AUD (extended). The AD2S80AUD specifically denotes the extended temperature range version within the 40-lead DIP package family. It shares the same core functionality and pinout with other AD2S80A models but is qualified for harsher environmental conditions up to +125°C.

Replacement Considerations

Direct pin-compatible replacements include other AD2S80A variants (e.g., AD2S80ABD) if temperature ranges align. For higher performance or different packages, consider the AD2S82A or AD2S90, though these may require schematic adjustments due to differing pinouts or feature sets.