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AD2S1205 Datasheet(PDF) 1 Page - Analog Devices

Part No. AD2S1205
Description  12-Bit R/D Converter with Reference Oscillator
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD2S1205 Datasheet(HTML) 1 Page - Analog Devices

 
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12-Bit R/D Converter
with Reference Oscillator
Preliminary Technical Data
AD2S1205
Rev. PrB_10/06
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. Trademarks and
registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.326.8703
© 2006 Analog Devices, Inc. All rights reserved.
FEATURES
Complete monolithic R/D converter
Parallel and serial 12-bit data ports
System fault detection
Absolute position and velocity outputs
Differential inputs
±11 arc minutes of accuracy
1,250 rps maximum tracking rate, 12-bit resolution
Incremental encoder emulation (1,024 pulses/rev)
Programmable sinusoidal oscillator on-board
Compatible with DSP and SPI® interface standards
204.8 kHz square wave output
Single-supply operation (5.00 V ± 5%)
−40°C to +125°C temperature rating
44-lead LQFP package
4 kV ESD protection
GENERAL DESCRIPTION
The AD2S1205 is a complete 12-bit resolution tracking
resolver-to-digital converter, integrating an on-board
programmable sinusoidal oscillator that provides sine wave
excitation for resolvers. An external crystal is recommended to
provide a precision time reference.
The converter accepts 3.15 V p-p ± 27% input signals, in the
range of 10 kHz to 20 kHz on the Sin and Cos inputs. A Type II
servo loop is employed to track the inputs and convert the input
Sin and Cos information into a digital representation of the
input angle and velocity. The maximum tracking rate of the
converter is set internally by the input clock frequency. The
nominal clock frequency is 8.192MHz which allows a tracking
rate of 1,000rps. However by increasing the clock frequency to
10.24MHz a maximum tracking rate of 1,250 rps can be
achieved.
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
OSCILLATOR
(DAC)
ADC
ADC
EXCITATION
OUTPUTS
POSITION REGISTER
RESET
DATA I/O
AD2S1205
ENCODER
EMULATION
SYNTHETIC
REFERENCE
VOLTAGE
REFERENCE
INTERNAL
CLOCK
GENERATOR
FAULT
DETECTION
TYPE II TRACKING LOOP
VELOCITY REGISTER
MULTIPLEXER
DATA BUS OUTPUT
INPUTS
FROM
RESOLVER
FAULT
DETECTION
OUTPUTS
ENCODER
EMULATION
OUTPUTS
CRYSTAL
REFERENCE
PINS
Figure 1.


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