AD2S1200WSTZ

Overview

The AD2S1200WSTZ is a complete monolithic 12-bit resolver-to-digital converter (RDC) manufactured by Analog Devices Inc. It integrates an on-board programmable sinusoidal oscillator to provide excitation for resolvers, eliminating the need for external signal generation. The device accepts differential Sin and Cos input signals with a peak-to-peak voltage range of 3.24 V to 3.96 V. It operates on a single 5.00 V ± 5% supply and features both parallel and serial 12-bit data ports for absolute position and velocity outputs. The component supports a maximum tracking rate of 1,000 rps at 12-bit resolution and includes system fault detection capabilities.

Feature Summary

• Complete monolithic R/D converter with integrated programmable sinusoidal oscillator
• 12-bit resolution with ±11 arc minutes accuracy (Y Grade) or ±22 arc minutes (W Grade)
• Dual interface options: 12-bit parallel port and 3-wire serial interface compatible with SPI/DSP standards
• System fault detection for Loss of Signal (LOS), Signal Degradation (DOS), and Loss of Tracking (LOT)

Applications

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

Procurement Notes

Verify the specific grade suffix when ordering. The 'W' in AD2S1200WSTZ indicates the W Grade variant, which has an angular accuracy specification of ±22 arc minutes compared to the Y Grade's ±11 arc minutes. Confirm that the required package is the 44-lead LQFP and ensure the application utilizes an external 8.192 MHz crystal for the precision time reference as specified in the datasheet.

Selection Notes

Select this component for applications requiring high-resolution angle and velocity feedback from a resolver. Ensure the system design accommodates the fixed bandwidth of approximately 1.7 kHz and the maximum tracking rate of 1,000 rps. Verify that the host processor can interface with either the parallel or serial data ports. Note that the device requires an external 8.192 MHz crystal; internal clock generation is not supported.

Part Context

The AD2S1200 belongs to the AD2S1200 family of resolver-to-digital converters. It is functionally similar to the AD2S1205 but differs in maximum tracking rate specifications. The AD2S1200 is rated for 1,000 rps, whereas the AD2S1205 supports up to 1,250 rps. Both devices share the same 44-lead LQFP package and core architecture, including the integrated oscillator and fault detection logic.

Replacement Considerations

The AD2S1205WSTZ is a direct pin-compatible alternative within the same family. However, it offers a higher maximum tracking rate of 1,250 rps compared to the AD2S1200's 1,000 rps. If the application does not require speeds exceeding 1,000 rps, the AD2S1200WSTZ remains suitable. No other cross-model substitutes are documented in the provided source material.