Variable Resolution, a Resolver-to-Digital Converter AD2S83 FEATURES FUNCTIONAL BLOCK DIAGRAM Tracking R/D Converter REFERENCE High Accuracy Velocity Output I/P OFFSET ADJUST R9 High Max Tracking Rate 1040 RPS (10 Bits) HF FILTER C3 +12V 12V 44-Lead PLCC Package R2 R3 R8 C1 10-, 12-, 14-, or 16-Bit Resolution Set by User C2 BANDWIDTH R1 Ratiometric Conversion SELECTION R4 Stabilized Velocity Reference AC ERROR O/P INTEGRATOR C5 Dynamic Performance Set by User I/P DEMOD R5 O/P Industrial Temperature Range C4 SIN A1 SIG SEGMENT PHASE R 2R DAC A3 APPLICATIONS GND SWITCHING SENSITIVE INTEGRATOR VELOCITY DETECTOR O/P SIGNAL COS A2 DC and AC Servo Motor Control GND AD2S83 R6 Process Control TRACKING RIPPLE VCO Numerical Control of Machine Tools RATE 16-BIT UP/DOWN COUNTER CLOCK I/P SELECTION Robotics VCO + DATA +12V C7 TRANSFER OUTPUT DATA LATCH Axis Control 12V LOGIC VCO R7 O/P 3K3 C6 DATA SC1 SC2 ENABLE DIG BUSY DIRECTION INHIBIT BYTE 5V LOAD 390pF GND SELECT 16 DATA BITS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD2S83 is a monolithic 10-, 12-, 14-, or 16-bit tracking High Accuracy Velocity Output. A precision analog velocity resolver-to-digital converter. signal with a typical linearity of 0.1% and reversion error less than 0.3% is generated by the AD2S83. The provision of this The converter allows users to select their own resolution and dynamic signal removes the need for mechanical tachogenerators used in performance with external components. The converter allows users to servo systems to provide loop stabilization and speed control. 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) Resolution Set by User. Two control pins are used to select when set to 10-bit resolution. the resolution of the AD2S83 to be 10, 12, 14 or 16 bits allow- ing optimum resolution for each application. The AD2S83 converts resolver format input signals into a paral- lel natural binary digital word using a ratiometric tracking con- Ratiometric Tracking Conversion. This technique provides version method. This ensures high noise immunity and tolerance continuous output position data without conversion delay. It of long leads allowing the converter to be located remote from also provides noise immunity and tolerance of harmonic distor- the resolver. tion on the reference and input signals. The position output from the converter is presented via 3-state Dynamic Performance Set by the User. By selecting external output pins which can be configured for operations with 8- or resistor and capacitor values the user can determine band- 16-bit bus. BYTE SELECT, ENABLE and INHIBIT pins width, maximum tracking rate and velocity scaling of the ensure easy data transfer to 8- and 16-bit data bus, and outputs converter to match the system requirements. The component are provided to allow for cycle or pitch counting in external values are easy to select using the free component selection counters. software design aid. A precise analog signal proportional to velocity is also available MODELS AVAILABLE and will replace a tachogenerator. Information on the models available is given in the Ordering The AD2S83 operates over reference frequencies in the range Guide. 0 Hz to 20,000 Hz. REV. E Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. use, nor for any infringements of patents or other rights of third parties Tel: 781/329-4700 World Wide Web Site: ( V = 12 V dc 5% V = 5 V dc 10% T = 40 C to +85 C) AD2S83SPECIFICATIONS S L A Parameter Conditions Min Typ Max Unit SIGNAL INPUTS (SIN, COS) 1 Frequency 0 20,000 Hz Voltage Level 1.8 2.0 2.2 V rms Input Bias Current 60 150 nA Input Impedance 1.0 M REFERENCE INPUT (REF) Frequency 0 20,000 Hz Voltage Level 1.0 8.0 V pk Input Bias Current 60 150 nA Input Impedance 1.0 M PERFORMANCE Repeatability 1 LSB Allowable Phase Shift (Signals to Reference) 10 +10 Degree Max Tracking Rate 10 Bits 1040 rps 12 Bits 260 rps 14 Bits 65 rps 16 Bits 16.25 rps Bandwidth User Selectable ACCURACY Angular Accuracy A, I 8 +1 LSB arc min Monotonicity Guaranteed Monotonic Missing Codes (16-Bit Resolution) A, I 4 Codes VELOCITY SIGNAL 2, 3, 4 LINEARITY AD2S83AP 0 kHz500 kHz 40C to +85C 0.15 0.25 % FSR 0.5 MHz1 MHz 40C to +85C 0.25 1.0 % FSR AD2S83IP 0 kHz500 kHz 40C to +85C 0.25 0.5 % FSR 0.5 MHz1 MHz 40C to +85C 0.25 1.0 % FSR Reversion Error AD2S83AP 40C to +85C 0.5 1.0 % O/P AD2S83IP 40C to +85C 1.0 1.5 % O/P 5 DC Zero Offset 3mV Gain Scaling Accuracy 1.5 3 % FSR Output Voltage 1 mA Load 8V Dynamic Ripple Mean Value 1.0 % rms O/P INPUT/OUTPUT PROTECTION Analog Inputs Overvoltage Protection 8V Analog Outputs Short Circuit O/P Protection 5.6 8 10.4 mA DIGITAL POSITION Resolution 10, 12, 14, and 16 Bits Output Format Bidirectional Natural Binary Load 3 LSTTL 6 INHIBIT Sense Logic LO to INHIBIT Time to Stable Data 240 390 490 ns 6 ENABLE Logic LO Enables Position Output Logic HI Outputs in High 6 ENABLE /Disable Time Impedance State 35 110 ns 6 BYTE SELECT Sense Logic HI MS Byte DB1DB8 Logic LO LS Byte DB1DB8 Time to Data Available 60 140 ns SHORT CYCLE INPUTS Internally Pulled High via 100 k to +V S SC1 SC2 0 0 10-Bit Resolution 0 1 12-Bit Resolution 1 0 14-Bit Resolution 1 1 16-Bit Resolution 2 REV. 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