AD2S81A

a 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 GENERAL DESCRIPTION Variable Resolution, Monolithic Resolver-to-Digital Converters AD2S81A/AD2S82A AD2S82A FUNCTIONAL BLOCK DIAGRAM DEMOD DEMOD INTEGRATOR I/P O/P I/P AD2S82A SIN I/P SIGNAL GND COS I/P ANALOG GND RIPPLE CLK +12V –12V COMP DATA LOAD A1 SEGMENT SWITCHING A2 PHASE SENSITIVE DETECTOR R-2R DAC INTEGRATOR O/P A3 AC ERROR O/P VCO I/P INHIBIT VCO O/P +5V 16-BIT UP/DOWN COUNTER VCO DATA TRANSFER LOGIC OUTPUT DATA LATCH SC2 SC1 ENABLE BUSY DIR BYTE SELECT DIGITAL GND 16 DATA BITS 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 required 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 allowing the user to use the AD2S82A with the optimum resolution for each application. Ratiometric...