AD2S90AP

Overview

The AD2S90AP is a complete monolithic resolver-to-digital converter with 12-bit resolution. It accepts differential 2 V rms signals at 3 kHz–20 kHz on SIN, COS, and REF inputs. The device features an internal Type II servo loop with a 1 kHz bandwidth and a maximum tracking rate of 500 rps. Position data is available as absolute serial binary (12-bit) via a 3-wire interface or incremental A/B/NM emulation equivalent to a 1024-line encoder. An analog velocity output provides angular speed information. Operating on ±5 V supplies, it consumes approximately 50 mW and ensures –10.6 arc minutes of angular accuracy within the industrial temperature range of –40°C to +85°C.

Feature Summary

• Complete 12-bit Resolver-to-Digital Conversion without external components
• Dual Output Formats: Absolute Serial Binary and Incremental Encoder Emulation (A, B, NM)
• Analog Velocity Output with 150 rps/V scaling
• Industrial Temperature Range (-40°C to +85°C) in 20-Lead PLCC Package

Applications

• Industrial Motor Control
• Servo Motor Control Systems
• Industrial Gauging and Factory Automation
• Encoder Emulation for Legacy System Upgrades
• Automotive Motion Sensing and Control

Procurement Notes

Verify the specific suffix 'AP' confirms the industrial temperature grade (-40°C to +85°C) and 10.6 arc minute accuracy. Confirm package type is 20-lead PLCC. Check current availability status as distribution may vary. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS input protection circuits.

Selection Notes

Select the AD2S90AP when a complete, low-power solution for digitizing resolver signals is required without external support circuitry. It is suitable for applications needing both absolute position data via serial interface and incremental feedback compatible with standard quadrature decoders. Verify that the input signal frequency falls within the 3 kHz to 20 kHz range and that the power supply requirements match the ±5 V specification.

Part Context

The AD2S90 belongs to Analog Devices' AD2S series of resolver-to-digital converters. It utilizes Linear Compatible CMOS (LC2MOS) technology to combine precision bipolar circuits with low-power CMOS logic. This integration allows for high accuracy and low power consumption in a single chip, distinguishing it from discrete solutions or earlier generations requiring multiple components for signal conditioning and conversion.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.