AD2S1200WST

Overview

The AD2S1200WST is a 12-bit resolution tracking resolver-to-digital converter (RDC) from Analog Devices, housed in a 44-lead LQFP package. It integrates an on-board programmable sinusoidal oscillator for resolver excitation and requires an external 8.192 MHz crystal for precision timing. The device operates on a single 5.00 V ± 5% supply across a temperature range of −40°C to +125°C. It provides absolute position and velocity outputs via parallel or serial interfaces, supporting a maximum tracking rate of 1,000 rps with ±11 arc minutes accuracy.

Feature Summary

• Complete monolithic R/D converter with integrated programmable sinusoidal oscillator
• Differential Sin/Cos inputs with ±11 arc minutes angular accuracy
• Triple format data: 12-bit absolute position, 12-bit signed velocity, and incremental encoder emulation
• System fault detection for loss of signal, degradation, and tracking loss

Applications

• Electric power steering systems
• Automotive motion sensing and control
• Integrated starter generator/alternator applications
• Encoder emulation in electric vehicles

Procurement Notes

Verify the specific suffix 'WST' against the manufacturer's current ordering guide to confirm the exact grade and packaging configuration. Ensure compatibility with the required 8.192 MHz external crystal for clock generation. Confirm that the 44-lead LQFP footprint matches the target PCB design constraints.

Selection Notes

Select this component when a complete 12-bit RDC solution with built-in excitation is required. The AD2S1200 supports frequencies of 10 kHz, 12 kHz, 15 kHz, and 20 kHz via FS1/FS2 pins. It is suitable for environments requiring operation up to 125°C and offers 4 kV ESD protection. Ensure the application does not exceed the 1,000 rps maximum tracking rate specification.

Part Context

The AD2S1200 belongs to the Analog Devices AD2S1200 series of resolver-to-digital converters. It is designed to replace discrete analog solutions by integrating the tracking loop, oscillator, and digital interface into a single chip. The WST suffix typically denotes a specific industrial or automotive grade variant within the LQFP-44 package family.

Replacement Considerations

Direct pin-compatible replacements may include other members of the AD2S1200 family such as the AD2S1200YSTZ, provided the temperature grade and accuracy specifications meet the system requirements. Verify that any substitute maintains the same 44-lead LQFP outline dimensions and electrical characteristics.