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AD2S81 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD2S81 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page REV. B 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 which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Variable Resolution, Monolithic Resolver-to-Digital Converters AD2S81A/AD2S82A An analog signal proportional to velocity is also available and can be used to replace a tachogenerator. PRODUCT HIGHLIGHTS Monolithic. A one-chip solution reduces the package size re- quired and increases the reliability. Resolution Set by User. Two control pins are used to select the resolution of the AD2S82A to be 10, 12, 14 or 16 bits al- lowing the user to use the AD2S82A with the optimum resolu- tion for each application. Ratiometric Tracking Conversion. Conversion technique provides continuous output position data without conversion delay and is insensitive to absolute signal levels. It also provides good noise immunity and tolerance to harmonic distortion on the reference and input signals. Dynamic Performance Set by the User. By selecting exter- nal resistor and capacitor values the user can determine band- width, maximum tracking rate and velocity scaling of the converter to match the system requirements. The external com- ponents required are all low cost, preferred value resistors and capacitors, and the component values are easy to select using the simple instructions given. Velocity Output. An analog signal proportional to velocity is available and is linear to typically one percent. This can be used in place of a velocity transducer in many applications to provide loop stabilization in servo controls and velocity feedback data. Low Power Consumption. Typically only 300 mW. MODELS AVAILABLE Information on the models available is given in the Ordering Guide. GENERAL DESCRIPTION The AD2S82A is a monolithic 10-, 12-, 14- or 16-bit tracking resolver-to-digital converter contained in a 44-lead J leaded PLCC package. Two extra functions are provided in the new surface mount package–COMPLEMENT and VCO output. The AD2S81A is a monolithic 12-bit fixed resolution tracking resolver-to-digital converter packaged in a 28-lead DIP. The converters allow users to select their own dynamic performance with external components. This allows the users great flexibility in defining the converter that best suits their system requirements. The AD2S82A allows users to select the resolution to be 10, 12, 14 or 16 bits and to track resolver signals rotating at up to 1040 revs per second (62,400 rpm) when set to 10-bit resolution. The AD2S81A and AD2S82A convert resolver format input signals into a parallel natural binary digital word using a ratio- metric tracking conversion method. This ensures high-noise immunity and tolerance of lead length when the converter is remote from the resolver. The output word is in a three-state digital logic form available in two bytes on the 16 output data lines for the AD2S82A and on eight output data lines for the AD2S81A. BYTE SELECT, ENABLE and INHIBIT pins ensure easy data transfer to 8- and 16-bit data buses, and outputs are provided to allow for cycle or pitch counting in external counters. AD2S82A FUNCTIONAL BLOCK DIAGRAM SIN I/P SIGNAL GND COS I/P ANALOG GND RIPPLE CLK +12V –12V COMP DATA LOAD SEGMENT SWITCHING SC1 SC2 16 DATA BITS BYTE SELECT BUSY DIR AC ERROR O/P VCO I/P AD2S82A VCO O/P 16-BIT UP/DOWN COUNTER VCO DATA TRANSFER LOGIC +5V DIGITAL GND R-2R DAC INTEGRATOR I/P PHASE SENSITIVE DETECTOR DEMOD I/P DEMOD O/P OUTPUT DATA LATCH INTEGRATOR O/P A2 A1 A3 INHIBIT ENABLE FEATURES Monolithic (BiMOS ll) Tracking R/D Converter Ratiometric Conversion Low Power Consumption: 300 mW Typ Dynamic Performance Set by User Velocity Output ESD Class 2 Protection (2,000 V Min) AD2S81A 28-Lead DIP Package Low Cost AD2S82A 44-Lead PLCC Package 10-, 12-, 14- and 16-Bit Resolution Set by User High Max Tracking Rate 1040 RPS (10 Bits) VCO Output (Inter LSB Output) Data Complement Facility Industrial Temperature Range APPLICATIONS DC Brushless and AC Motor Control Process Control Numerical Control of Machine Tools Robotics Axis Control One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1998 |
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