AD2S80ATD/B

Overview

The AD2S80ATD/B is a monolithic, variable-resolution tracking resolver-to-digital converter manufactured by Analog Devices Inc. using BiMOS II technology. It converts analog resolver sine/cosine signals into parallel natural binary digital words with user-selectable resolutions of 10, 12, 14, or 16 bits. The device operates within an industrial temperature range of -40°C to +85°C and utilizes a ratiometric conversion method for high noise immunity. Key electrical parameters include a maximum tracking rate of 16.25 rps at 16-bit resolution, a signal frequency range of 50 Hz to 20,000 Hz, and typical power consumption of 300 mW. It features a velocity output proportional to angular speed.

Feature Summary

• Variable Resolution: User-selectable 10, 12, 14, or 16-bit resolution via SC1/SC2 pins.
• Ratiometric Tracking: Continuous position data without conversion delay; insensitive to absolute signal levels.
• Velocity Output: Analog signal proportional to velocity, linear to typically one percent.
• Industrial Grade: Qualified for operation between -40°C and +85°C.

Applications

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

Procurement Notes

Verify the suffix 'TD' indicates the Industrial Temperature Range (-40°C to +85°C) and 'B' denotes the package style or revision as per the manufacturer's current ordering guide. Confirm that the component is sourced from authorized distributors to ensure authenticity, as the device is ESD sensitive. Check for specific MIL-STD-883B processing requirements if military qualification is needed, though standard commercial versions are available.

Selection Notes

Select this component when a single-chip solution for resolver feedback is required with adjustable dynamic performance. The resolution and bandwidth must be configured using external resistors and capacitors (R4, R6, C4, etc.) to match system tracking rates. Ensure the reference signal frequency is between 50 Hz and 20,000 Hz. For systems requiring tachogenerator replacement, utilize the analog velocity output pin.

Part Context

The AD2S80A series includes variants such as AD2S80AJD (Military), AD2S80JD (Commercial), and AD2S80ATD (Industrial). The AD2S80ATD/B specifically refers to the industrial temperature grade version in a 40-lead DIP package. It belongs to the AD2S8X family of variable resolution RDCs, designed to replace discrete multi-chip solutions, thereby reducing board space and increasing reliability through monolithic BiMOS integration.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD2S80AJD (Military Temp) and AD2S80JD (Commercial Temp). Other models like AD2S82A offer similar functionality but may differ in package type (LCC) or accuracy specifications. Verify that any substitute supports the required 10-16 bit resolution selection and industrial temperature range.

FAQ

How is the resolution of the AD2S80ATD/B configured?

Resolution is set by the logic states of the SC1 and SC2 control pins. SC1=0, SC2=0 selects 10 bits; SC1=0, SC2=1 selects 12 bits; SC1=1, SC2=0 selects 14 bits; and SC1=1, SC2=1 selects 16 bits.

What is the maximum tracking rate for 16-bit resolution?

At 16-bit resolution, the maximum tracking rate is 16.25 revolutions per second (rps). Higher tracking rates are achievable at lower resolutions, up to 1040 rps at 10-bit resolution.

Can the AD2S80ATD/B replace a tachogenerator?

Yes, the device provides an analog velocity output signal that is proportional to the input rotation speed. This signal is linear to typically one percent and can be used for loop stabilization in servo controls.