Variable Resolution, 10-Bit to 16-Bit R/D Converter with Reference Oscillator Data Sheet AD2S1210 FEATURES FUNCTIONAL BLOCK DIAGRAM REFERENCE CRYSTAL PINS Complete monolithic resolver-to-digital converter 3125 rps maximum tracking rate (10-bit resolution and CLKIN = 10.24 MHz) REFERENCE INTERNAL VOLTAGE EXCITATION CLOCK OSCILLATOR REFERENCE 2.5 (+ 1 LSB) arc minutes of angular accuracy (B and D grades) OUTPUTS (DAC) GENERATOR 10-/12-/14-/16-bit resolution, set by user Parallel and serial 10-bit to 16-bit data ports SYNTHETIC AD2S1210 REFERENCE Absolute position and velocity outputs System fault detection ADC Programmable fault detection thresholds INPUTS FAULT TYPE II FAULT FROM DETECTION TRACKING LOOP DETECTION Differential inputs RESOLVER OUTPUTS ADC Incremental encoder emulation Programmable sinusoidal oscillator on-board POSITION VELOCITY CONFIGURATION Compatible with DSP and SPI standards REGISTER REGISTER DATA I/O REGISTER 5 V supply with 2.3 V to 5.25 V logic interface ENCODER 40C to +125C temperature rating (C, D, and W grades) EMULATION MULTIPLEXER OUTPUTS AEC-Q100 qualified for automotive applications ASIL B safety assessment certificate available DATA BUS OUTPUT Safety manual available DATA I/O RESET APPLICATIONS Figure 1. DC and ac servo motor control PRODUCT HIGHLIGHTS Encoder emulation Electric power steering 1. Ratiometric tracking conversion. The Type II tracking loop Electric vehicles provides continuous output position data without conversion Integrated starter generators and alternators delay. It also provides noise immunity and tolerance of Automotive motion sensing and control harmonic distortion on the reference and input signals. 2. System fault detection. A fault detection circuit can sense GENERAL DESCRIPTION loss of resolver signals, out-of-range input signals, input The AD2S1210 is a complete 10-bit to 16-bit resolution tracking signal mismatch, or loss of position tracking. The fault resolver-to-digital converter, integrating an on-board programmable detection threshold levels can be individually programmed sinusoidal oscillator that provides sine wave excitation for by the user for optimization within a particular application. resolvers. 3. Input signal range. The sine and cosine inputs can accept differential input voltages of 3.15 V p-p 27%. The converter accepts 3.15 V p-p 27% input signals, in the range 4. Programmable excitation frequency. Excitation frequency of 2 kHz to 20 kHz on the sine and cosine inputs. A Type II servo is easily programmable to a number of standard frequencies loop is employed to track the inputs and convert the input sine between 2 kHz and 20 kHz. and cosine information into a digital representation of the input 5. Triple format position data. Absolute 10-bit to 16-bit angular angle and velocity. The maximum tracking rate is 3125 rps. position data is accessed via either a 16-bit parallel port or a The AD2S1210WDSTZ and the AD2S1210WDSTZRL7 models 4-wire serial interface. Incremental encoder emulation is in have been approved by an independent accredited body for use standard A-quad-B format with direction output available. in Automotive Safety Integrity Level B rated applications according 6. Digital velocity output. 10-bit to 16-bit signed digital velocity to ISO 26262. Contact your local Analog Devices, Inc., sales accessed via either a 16-bit parallel port or a 4-wire serial office to obtain a copy of the safety manual and ASIL B safety peripheral interface (SPI). assessment certificate. Rev. B Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082021 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com ENCODER EMULATION 07467-001AD2S1210 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 LOS Threshold Register ............................................................ 21 Applications ....................................................................................... 1 DOS Overrange Threshold Register ........................................ 21 General Description ......................................................................... 1 DOS Mismatch Threshold Register ......................................... 21 Functional Block Diagram .............................................................. 1 DOS Reset Maximum and Minimum Threshold Registers . 22 Product Highlights ........................................................................... 1 LOT High Threshold Register .................................................. 22 Table of Contents .............................................................................. 2 LOT Low Threshold Register ................................................... 22 Revision History ............................................................................... 2 Excitation Frequency Register .................................................. 22 Specifications ..................................................................................... 3 Control Register ......................................................................... 22 Timing Specifications .................................................................. 6 Software Reset Register ............................................................. 23 Absolute Maximum Ratings ............................................................ 8 Fault Register .............................................................................. 23 ESD Caution .................................................................................. 8 Digital interface .............................................................................. 24 Pin Configuration and Function Descriptions ............................. 9 SOE Input .................................................................................... 24 Typical Performance Characteristics ........................................... 11 SAMPLE Input............................................................................ 24 Resolver Format Signals ................................................................. 15 Data Format ................................................................................ 24 Theory of Operation ...................................................................... 16 Parallel Interface ......................................................................... 24 Resolver to Digital Conversion ................................................. 16 Serial Interface ............................................................................ 28 Fault Detection Circuit .............................................................. 16 Incremental Encoder Outputs .................................................. 31 On-Board Programmable Sinusoidal Oscillator .................... 18 Supply Sequencing and Reset ................................................... 31 Synthetic Reference Generation ............................................... 18 Circuit Dynamics ........................................................................... 32 Connecting the Converter ......................................................... 19 Loop Response Model ............................................................... 32 Configuration of AD2S1210 ......................................................... 20 Sources of Error .......................................................................... 33 Modes of Operation ................................................................... 20 Outline Dimensions ....................................................................... 34 Register Map .................................................................................... 21 Ordering Guide .......................................................................... 34 Position Register ......................................................................... 21 Automotive Products ................................................................. 34 Velocity Register ......................................................................... 21 REVISION HISTORY 3/2021Rev. A to Rev. B 2/2010Rev. 0 to Rev. A Changes to Features Section and General Description Section ........ 1 Changes to Typical Performance Characteristics Section .. 11, 12 Changes to Specifications Section and Table 1 ..................................... 3 Changes to Ordering Guide .......................................................... 34 Deleted Note 1, Timing Specifications Section .................................... 6 Changes to LOT Low Threshold Register Section ..................... 22 8/2008Revision 0: Initial Version Changes to Where List of Equation 16 ........................................ 32 Changes to Ordering Guide .......................................................... 34 Added Automotive Products Section .......................................... 34 Rev. B Page 2 of 34