AD2S80ASD

Overview

The AD2S80ASD is a monolithic resolver-to-digital converter manufactured on a BiMOS II process, housed in a 40-lead DIP package. It provides variable resolution of 10, 12, 14, or 16 bits, selectable via external logic inputs SC1 and SC2. The device utilizes ratiometric tracking conversion to translate sine/cosine resolver signals into parallel natural binary digital words. It operates with ±12 V analog supplies and +5 V logic supply, supporting reference frequencies from 50 Hz to 20,000 Hz. The extended temperature grade (SD suffix) ensures functionality from -55°C to +125°C.

Feature Summary

• Variable Resolution: User-selectable 10, 12, 14, or 16-bit output via SC1/SC2 pins.
• High Tracking Rate: Up to 1040 rps at 10-bit resolution; up to 16.25 rps at 16-bit resolution.
• Velocity Output: Analog signal proportional to velocity, linear to typically 1% FSD.
• Ratiometric Conversion: High noise immunity and tolerance to lead length variations.

Applications

• DC Brushless and AC Motor Control
• Robotics and Axis Control
• Military Servo Control Systems

Procurement Notes

Verify the 'SD' suffix indicates the Extended Temperature Range (-55°C to +125°C). Confirm the package is the 40-lead Ceramic DIP. Ensure the specific revision matches system requirements, as specifications are subject to change without notice. Cross-reference pinout for SIN, COS, REF, and data lines DB1-DB16.

Selection Notes

Select external components R4 and R6 based on the chosen resolution and desired maximum tracking rate. Ensure bandwidth selection capacitors C4/C5 maintain the recommended reference frequency to bandwidth ratio. Use shielded twisted pair cables for resolver connections to minimize coupling between sine and cosine signals.

Part Context

The AD2S80A series includes commercial (JD/KD/LD), industrial (AD/BD), and extended (SD/SE/TD/TE/UD/UE) temperature grades. The AD2S80ASD specifically denotes the extended temperature variant in the 40-lead DIP package. Other variants include the AD2S80AJD and AD2S80ABD.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.

FAQ

How is the resolution configured?

Resolution is set by the logic states of the SC1 and SC2 pins: 0/0 for 10-bit, 0/1 for 12-bit, 1/0 for 14-bit, and 1/1 for 16-bit.

What is the function of the AC Error Output?

The AC Error Output provides a signal proportional to the error between the input angle and the output digital angle, which can be used for built-in-test applications.

How does the Ripple Clock operate?

A positive pulse is generated when the output changes from all 1s to all 0s or vice versa, indicating the completion of a revolution or pitch.