AD2S82AHPZ

Overview

The AD2S82AHPZ is a monolithic, variable-resolution resolver-to-digital converter manufactured by Analog Devices Inc. It converts analog sine and cosine signals from a resolver into a parallel natural binary digital word using a ratiometric tracking method. The device supports user-selectable resolutions of 10, 12, 14, or 16 bits via SC1 and SC2 pins. It operates with dual power supplies ranging from ±10.8 V to ±13.2 V and a logic supply of +5 V to +V_S. The component is housed in a 44-lead Plastic Leaded Chip Carrier (PLCC) package and provides an analog velocity output proportional to the rate of change of the input angle.

Feature Summary

• Variable Resolution: User-selectable 10, 12, 14, or 16-bit resolution via SC1/SC2 control pins.
• Ratiometric Tracking: Continuous position data conversion insensitive to absolute signal levels and lead length.
• Velocity Output: Analog signal linear to typically one percent, usable as a tachogenerator replacement.
• Dynamic Performance: Bandwidth and maximum tracking rate are set by external resistor and capacitor values.

Applications

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

Procurement Notes

Verify the specific accuracy grade required for the application, as the HP suffix denotes industrial temperature range (-40°C to +85°C) with 22 arc min accuracy. Confirm that the 44-PLCC surface mount package matches the PCB footprint. Check current availability status, as older generation components may have limited stock or end-of-life implications compared to newer integrated solutions.

Selection Notes

Select the AD2S82AHPZ when variable resolution and high tracking rates are required. Ensure external components for bandwidth selection (C4, C5, R5) and tracking rate (R6) are chosen according to the reference frequency and desired dynamic response. Verify that the system can accommodate the ±12 V power supplies and that the resolver signal amplitudes remain within 10% of nominal for optimal performance.

Part Context

The AD2S82AHPZ belongs to the AD2S81A/AD2S82A family of monolithic BiMOS II tracking converters. Unlike the fixed 12-bit AD2S81A, the AD2S82A offers flexible resolution settings and additional features such as a VCO output and data complement facility. The HP suffix specifically indicates the plastic PLCC package and industrial temperature rating, distinguishing it from ceramic DIP or commercial grade variants.

Replacement Considerations

Direct pin-compatible replacements are not explicitly listed in the provided documentation. Consider the AD2S82ALP for lower angular accuracy requirements (2 arc min vs 22 arc min) or different temperature grades if available. For modern designs, evaluate newer single-chip solutions like the AD2S1210 or AD2S90 families which may offer integrated excitation and digital interfaces.