AD2S1210DSTZ

Overview

The AD2S1210DSTZ is a monolithic resolver-to-digital converter (RDC) from Analog Devices, housed in a 48-lead LQFP package. It provides 10-bit to 16-bit programmable resolution for absolute position and velocity measurements. The device integrates an on-board programmable sinusoidal oscillator with frequencies ranging from 2 kHz to 20 kHz. It accepts differential sine/cosine input signals of 3.15 V p-p ± 27% and utilizes a Type II tracking loop for ratiometric conversion. Operating at a single 5 V supply, it supports both parallel and serial data interfaces and includes system fault detection capabilities.

Feature Summary

• Integrated programmable sinusoidal oscillator providing excitation between 2 kHz and 20 kHz
• Type II tracking loop enabling continuous position output without conversion delay
• Programmable resolution options: 10, 12, 14, or 16 bits
• System fault detection for signal loss, overrange, mismatch, and tracking errors

Applications

• DC and AC servo motor control
• Electric power steering systems
• Automotive motion sensing and control
• Encoder emulation applications

Procurement Notes

Verify the specific grade suffix (e.g., C or D) against the required operating temperature range, as the base model number does not specify the thermal rating. Confirm interface requirements for the host controller, as the device supports both parallel and serial modes selectable via hardware pins. Ensure proper decoupling of AVDD, DVDD, and VDRIVE pins during PCB layout to maintain signal integrity.

Selection Notes

Select based on the required angular accuracy and maximum tracking rate. B and D grades offer ±2.5 arc minutes accuracy, while A and C grades provide ±5 arc minutes. Higher resolutions (14/16-bit) reduce the maximum allowable tracking rate compared to 10-bit mode. Verify that the host logic voltage (VDRIVE) falls within the 2.3 V to 5.25 V range if it differs from the analog supply.

Part Context

This component belongs to the AD2S1210 family of variable resolution R/D converters. It is designed to replace discrete solutions by integrating the oscillator, tracking loop, and digital interface into a single chip. The device is suitable for high-reliability environments, with specific variants available for automotive ASIL B applications.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD2S1210ASTZ, AD2S1210BSTZ, AD2S1210CSTZ, and AD2S1210DSTZ. These variants differ primarily in angular accuracy grades and operating temperature ranges rather than functional architecture.