AD2S1205WSTZ

Overview

The AD2S1205WSTZ is a complete monolithic 12-bit resolver-to-digital converter (RDC) featuring an on-board programmable sinusoidal oscillator. It accepts differential Sin/Cos input signals ranging from 2.3 V p-p to 4.0 V p-p and operates on a single 5.00 V ± 5% supply. The device utilizes a Type II tracking loop to convert analog resolver inputs into digital absolute position and velocity data without conversion delay. It provides parallel and serial 12-bit data ports, incremental encoder emulation, and comprehensive system fault detection for loss of signal, degradation, or tracking errors.

Feature Summary

• 12-bit resolution with ±11 arc minutes accuracy (Y grade) and 1250 rps maximum tracking rate at 10.24 MHz clock.
• Integrated programmable sinusoidal oscillator with selectable frequencies: 10 kHz, 12 kHz, 15 kHz, or 20 kHz.
• Triple format output including absolute 12-bit angular position/velocity via parallel or serial interfaces, plus A-quad-B incremental encoder emulation.
• Built-in fault detection circuitry monitoring Loss of Signal (LOS), Degradation of Signal (DOS), and Loss of Tracking (LOT).

Applications

• Automotive motion sensing and control systems
• Hybrid-electric vehicle powertrains
• Electric power steering (EPS)
• Industrial motor control and process control

Procurement Notes

Verify the specific suffix 'WSTZ' corresponds to the industrial temperature grade (-40°C to +125°C) in the 44-lead LQFP package. Confirm that the ordering documentation specifies tray packaging quantities, as reel options may exist for other variants in the family. Ensure compatibility with 5V logic levels for the parallel and serial interfaces.

Selection Notes

Select this component when a high-accuracy RDC with integrated excitation is required to minimize external BOM. The AD2S1205 supports both parallel and serial data access, offering flexibility for microcontroller integration. Ensure the application clock frequency aligns with the desired tracking rate, as performance scales with CLKIN up to 10.24 MHz for maximum dynamic specifications.

Part Context

The AD2S1205 belongs to Analog Devices' AD2S1200 series of 12-bit resolver-to-digital converters. It is functionally similar to the AD2S1200 but includes an on-board reference oscillator, eliminating the need for an external signal generator. The WSTZ suffix denotes the industrial temperature range variant packaged in a 44-lead LQFP.

Replacement Considerations

The AD2S1200YSTZ serves as a direct functional substitute if an external reference oscillator is already present in the design. Both devices share identical pinouts, electrical characteristics, and software interfaces, differing only in the internal oscillator presence.