AD2S80ALD

Overview

The AD2S80ALD is a monolithic tracking resolver-to-digital converter manufactured by Analog Devices Inc. It converts resolver format input signals into a parallel natural binary digital word using a ratiometric tracking conversion method. The device supports user-selectable resolutions of 10, 12, 14, or 16 bits via SC1 and SC2 pins. It operates with a reference frequency range of 50 Hz to 20,000 Hz and requires dual power supplies of ±10.8 V to ±13.2 V. Typical power consumption is 300 mW. The component is housed in a 40-lead ceramic DIP package and is rated for an industrial operating temperature range of -40°C to +85°C.

Feature Summary

• Monolithic BiMOS II construction combining CMOS logic and bipolar linear circuits.
• User-selectable resolution (10, 12, 14, or 16 bits) via external control pins.
• Ratiometric tracking conversion providing high noise immunity and lead length tolerance.
• Analog velocity output proportional to rotation speed, replacing tachogenerators.

Applications

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

Procurement Notes

Verify the specific suffix 'LD' confirms the Industrial Temperature Grade (-40°C to +85°C) and 40-Lead DIP package. Confirm that the ordering part number matches the exact resolution and performance grade required, as other suffixes may indicate Commercial or Extended temperature ranges or different packaging options like LCC.

Selection Notes

Select external components R4 and R6 based on the chosen resolution and desired maximum tracking rate. Ensure the reference frequency to bandwidth ratio adheres to guidelines: 2.5:1 for 10-bit, 4:1 for 12-bit, 6:1 for 14-bit, and 7.5:1 for 16-bit resolution. Use preferred value resistors and capacitors with 5% tolerance to maintain system accuracy.

Part Context

The AD2S80A series includes variants such as AD2S80AJD (Commercial), AD2S80ALD (Industrial), and military-grade parts processed per MIL-STD-883B. The AD2S80ALD specifically denotes the industrial temperature version in the standard 40-lead DIP package. Other models in the family include the AD2S82 and AD2S90, which offer similar functionality with different pinouts or features.

Replacement Considerations

Direct replacements within the same package and temperature grade include the AD2S80AJD for commercial applications if temperature requirements allow. For military specifications, verify availability of /883 B parts. Cross-model substitutes like the AD2S82 require evaluation of pin compatibility and resolution settings.