PDF AD2S1210 Data sheet ( Hoja de datos )

Número de pieza	AD2S1210
Descripción	10-Bit to 16-Bit R/D Converter
Fabricantes	Analog Devices
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Variable Resolution, 10-Bit to 16-Bit R/D Converter with Reference Oscillator AD2S1210 FEATURES Complete monolithic resolver-to-digital converter 3125 rps maximum tracking rate (10-bit resolution) ±2.5 arc minutes of accuracy 10-/12-/14-/16-bit resolution, set by user Parallel and serial 10-bit to 16-bit data ports Absolute position and velocity outputs System fault detection Programmable fault detection thresholds Differential inputs Incremental encoder emulation Programmable sinusoidal oscillator on-board Compatible with DSP and SPI interface standards 5 V supply with 2.3 V to 5 V logic interface −40°C to +125°C temperature rating APPLICATIONS DC and ac servo motor control Encoder emulation Electric power steering Electric vehicles Integrated starter generators/alternators Automotive motion sensing and control GENERAL DESCRIPTION The AD2S1210 is a complete 10-bit to 16-bit resolution tracking resolver-to-digital converter, integrating an on-board program- mable sinusoidal oscillator that provides sine wave excitation for resolvers. The converter accepts 3.15 V p-p ± 27% input signals, in the range of 2 kHz to 20 kHz on the sine and cosine inputs. A Type II servo loop is employed to track the inputs and convert the input sine and cosine information into a digital representation of the input angle and velocity. The maximum tracking rate is 3125 rps. Rev. A 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 rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. FUNCTIONAL BLOCK DIAGRAM REFERENCE PINS CRYSTAL EXCITATION OUTPUTS REFERENCE OSCILLATOR (DAC) VOLTAGE REFERENCE INTERNAL CLOCK GENERATOR SYNTHETIC REFERENCE AD2S1210 INPUTS FROM RESOLVER ADC ADC TYPE II TRACKING LOOP FAULT DETECTION FAULT DETECTION OUTPUTS ENCODER EMULATION OUTPUTS POSITION VELOCITY REGISTER REGISTER CONFIGURATION REGISTER DATA I/O MULTIPLEXER DATA BUS OUTPUT RESET DATA I/O Figure 1. PRODUCT HIGHLIGHTS 1. Ratiometric tracking conversion. The Type II tracking loop provides continuous output position data without conversion delay. It also provides noise immunity and tolerance of harmonic distortion on the reference and input signals. 2. System fault detection. A fault detection circuit can sense loss of resolver signals, out-of-range input signals, input signal mismatch, or loss of position tracking. The fault detection threshold levels can be individually programmed by the user for optimization within a particular application. 3. Input signal range. The sine and cosine inputs can accept differential input voltages of 3.15 V p-p ± 27%. 4. Programmable excitation frequency. Excitation frequency is easily programmable to a number of standard frequencies between 2 kHz and 20 kHz. 5. Triple format position data. Absolute 10-bit to 16-bit angular position data is accessed via either a 16-bit parallel port or a 4-wire serial interface. Incremental encoder emulation is in standard A-quad-B format with direction output available. 6. Digital velocity output. 10-bit to 16-bit signed digital velocity accessed via either a 16-bit parallel port or a 4-wire serial interface. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2008–2010 Analog Devices, Inc. All rights reserved. 1 page AD2S1210 Parameter POWER REQUIREMENTS AVDD DVDD VDRIVE POWER SUPPLY IAVDD IDVDD IOVDD Min Typ 4.75 4.75 2.3 Max Unit Conditions/Comments 5.25 V 5.25 V 5.25 V 12 mA 35 mA 2 mA 1 Temperature ranges are as follows: A, B grades: –40°C to +85°C; C, D grades: –40°C to +125°C. 2 The voltages, SIN, SINLO, COS, and COSLO, relative to AGND, must always be between 0.15 V and AVDD − 0.2 V. 3 All specifications within the angular accuracy parameter are tested at constant velocity, that is, zero acceleration. 4 The velocity accuracy specification includes velocity offset and dynamic ripple. 5 For example when RES0 = 0 and RES1 = 1, the position output has a resolution of 12 bits. The velocity output has a resolution of 11 bits with the MSB indicating the direction of rotation. In this example, with a CLKIN frequency of 8.192 MHz the velocity LSB is 0.488 rps, that is, 1000 rps/(211). 6 The clock frequency of the AD2S1210 can be supplied with a crystal, an oscillator, or directly from a DSP/microprocessor digital output. When using a single-ended clock signal directly from the DSP/microprocessor, the XTALOUT pin should remain open circuit and the logic levels outlined under the logic inputs parameter in Table 1 apply. Rev. A \| Page 5 of 36 5 Page AD2S1210 TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, AVDD = DVDD = VDRIVE = 5 V, SIN/SINLO = 3.15 V p-p, COS/COSLO = 3.15 V p-p, CLKIN = 8.192 MHz , unless otherwise noted. 9000 8000 7000 6000 5000 4500 4000 3500 3000 5000 4000 3000 2000 2500 2000 1500 1000 500 1000 0 CODE Figure 3. Typical 16-Bit Angular Accuracy Histogram Of Codes, 10,000 Samples 8000 7000 6000 5000 4000 3000 2000 1000 0 CODE Figure 4. Typical 14-Bit Angular Accuracy Histogram of Codes, 10,000 Samples, Hysteresis Disabled 12000 10000 8000 6000 CODE Figure 6. Typical 12-Bit Angular Accuracy Histogram of Codes, 10,000 Samples, Hysteresis Disabled 12000 10000 8000 6000 4000 2000 0 510 511 512 513 CODES 514 Figure 7. Typical 12-Bit Angular Accuracy Histogram of Codes, 10,000 Samples, Hysteresis Enabled 1400 1200 1000 800 600 4000 400 2000 0 2046 2047 2048 CODES 2049 2050 Figure 5. Typical 14-Bit Angular Accuracy Histogram of Codes, 10,000 Samples, Hysteresis Enabled 200 0 CODE Figure 8. Typical 10-Bit Angular Accuracy Histogram of Codes, 10,000 Samples, Hysteresis Disabled Rev. A \| Page 11 of 36 11 Page

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