AD2S1210WDSTZ

Overview

The AD2S1210WDSTZ is a complete monolithic resolver-to-digital converter (RDC) with 10-bit to 16-bit programmable resolution. It integrates an on-board sinusoidal oscillator for resolver excitation and employs a Type II tracking loop to convert sine/cosine inputs into digital angle and velocity data. The device supports differential inputs of 3.15 V p-p ± 27% at frequencies between 2 kHz and 20 kHz. It offers parallel and serial data ports, absolute position/velocity outputs, and incremental encoder emulation. Rated for -40°C to +125°C, it is AEC-Q100 qualified and approved for ASIL B automotive applications.

Feature Summary

• Complete monolithic RDC with integrated programmable sinusoidal oscillator (2 kHz to 20 kHz).
• Type II tracking loop provides continuous position output without conversion delay and noise immunity.
• Programmable resolution from 10-bit to 16-bit; maximum tracking rate of 3125 rps at 10-bit resolution.
• Dual interface options: 16-bit parallel port or 4-wire SPI serial interface.
• System fault detection for signal loss, overrange, mismatch, and tracking loss with programmable thresholds.

Applications

• DC and AC servo motor control
• Electric power steering systems
• Electric vehicle traction motors
• Integrated starter generators and alternators

Procurement Notes

Verify the specific grade suffix (e.g., WDSTZ indicates D-grade, wide temperature) against the required operating temperature range (-40°C to +125°C). Confirm that the ordering suffix matches the desired package and thermal characteristics as defined in the manufacturer's current ordering guide. Ensure compliance with ISO 26262 requirements if ASIL B certification documentation is needed for the final assembly.

Selection Notes

Select based on required angular accuracy grades (B/D grades offer ±2.5 arc min vs. A/C grades at ±5 arc min). Choose resolution (10-16 bit) considering the trade-off with maximum tracking rate and bandwidth. Ensure the system clock frequency (CLKIN) supports the desired resolution and tracking speed. Verify logic voltage compatibility (VDRIVE 2.3 V to 5.25 V) with the host microcontroller or DSP.

Part Context

The AD2S1210 series replaces older discrete RDC solutions by integrating the reference oscillator, analog front-end, and digital conversion engine into a single LQFP-48 package. The 'W' suffix denotes the extended industrial temperature range (-40°C to +125°C), making it suitable for harsh automotive environments compared to commercial grade variants.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD2S1210ASTZ and AD2S1210BSTZ, though these may differ in temperature rating or accuracy grade. Cross-family replacements require careful evaluation of oscillator integration and interface timing differences.