AD2S82AHP

Overview

The AD2S82AHP is a monolithic tracking-type resolver-to-digital converter (RDC) manufactured by Analog Devices Inc. It utilizes BiMOS II technology to integrate high-precision bipolar linear circuits with CMOS logic on a single chip. The device operates as a Type II servo loop system, continuously comparing internal digital angles against analog resolver inputs to generate error signals for closed-loop tracking. It supports configurable resolutions of 10, 12, 14, or 16 bits via external pin programming. Key electrical parameters include a supply voltage range of ±10.8V to ±13.2V, a maximum signal frequency of 20 kHz, and a maximum tracking rate of 16.25 revolutions per second in its highest resolution mode.

Feature Summary

• Closed-loop tracking architecture using phase-sensitive demodulation and VCO for continuous angle conversion without sampling latency
• Pin-programmable resolution supporting 10-bit, 12-bit, 14-bit, and 16-bit modes
• Parallel digital output interface with integrated speed and direction indication signals
• Configurable bandwidth and tracking rates through external resistor and capacitor selection

Applications

• High-precision position sensing in AC servo motor control systems
• Angle measurement in industrial machine tool axes
• Position feedback in robotic joint actuators
• Resolver digitization in aerospace flight control surfaces

Procurement Notes

Verify the specific suffix (e.g., HP vs HZ) against the current manufacturer datasheet, as package variations exist within the AD2S82 family. Confirm availability status, as certain variants may be discontinued or subject to limited supply constraints. Ensure the selected component matches the required operating temperature range and voltage specifications for the target application environment.

Selection Notes

Select the resolution mode based on the trade-off between angular accuracy and maximum tracking speed; higher bit counts reduce the maximum rotational velocity. Verify that the external RC network values are calculated to match the mechanical time constant of the load. Ensure the power supply provides stable ±10.8V to ±13.2V rails to maintain specified linearity and noise performance.

Part Context

The AD2S82AHP belongs to the AD2S82 series of resolver-to-digital converters. It serves as a legacy solution for applications requiring robust analog servo-based angle conversion. While newer digital RDCs offer different interfaces, this component remains relevant for designs utilizing traditional transformer-coupled resolvers where high reliability and immunity to electromagnetic interference are critical.

Replacement Considerations

Direct functional replacements within the same family include the AD2S82AJPZ, which offers an extended industrial temperature range (-55°C to +125°C) compared to the commercial grade of the AHP variant. Designers must verify pin compatibility and thermal management requirements when substituting between these packages.