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AD2S1200YST Datasheet

  • AD2S1200YST

  • 12-Bit R/D Converter with Reference Oscillator

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12-Bit R/D Converter
with Reference Oscillator
AD2S1200
FEATURES
Complete monolithic R/D converter
Parallel and serial 12-bit data ports
System fault detection
Absolute position and velocity outputs
Differential inputs
鹵11 arc minutes of accuracy
1,000 rps maximum tracking rate, 12-bit resolution
Incremental encoder emulation (1,024 pulses/rev)
Programmable sinusoidal oscillator on-board
Compatible with DSP and SPI廬 interface standards
204.8 kHz square wave output
Single-supply operation (5.00 V 鹵 5%)
鈭?0擄C
to +125擄C temperature rating
44-lead LQFP package
4 kV ESD protection
GENERAL DESCRIPTION
The AD2S1200 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 8.192 MHz crystal is required to provide
a precision time reference. This clock is internally divided to
generate a 4.096 MHz clock to drive all the peripherals.
The converter accepts 3.6 V p-p 鹵 10% 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 bandwidth of the converter is set
internally to 1.7 kHz with an external 8.192 MHz crystal. The
maximum tracking rate is 1,000 rps.
FUNCTIONAL BLOCK DIAGRAM
REFBYP
REFOUT
FS1
FS2
CLKIN
XTALOUT (8.192MHz)
AD2S1200
EXC
EXC
VOLTAGE
REFERENCE
REFERENCE
OSCILLATOR
(DAC)
(4.096MHz)
INTERNAL
CLOCK
GENERATOR
(204.8kHz)
CLOCK
DIVIDER
FAULT
INDICATORS
CPO
SYNTHETIC
REFERENCE
SinLO
Sin
ADC
ANGLE
胃
CosLO
Cos
ADC
ANGLE
蠁
A
B
NM
POSITION REGISTER
SAMPLE
MULTIPLEXER
ENCODER
EMULATION
POSITION
INTEGRATOR
ERROR
CALCULATION/
ERROR
SIGNAL
MONITOR
MONITOR
DEMODULATOR
MONITOR
ERROR
DOS
LOT
DIGITAL
FILTER
VELOCITY
INTEGRATOR
DIR
VELOCITY REGISTER
DATA BUS OUTPUT
CS
RD
04406-0-001
RESET
RDVEL
SOE
DB11
SO
DB10
SCLK
DB9鈥揇B0
Figure 1.
Rev. 0
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
漏 2003 Analog Devices, Inc. All rights reserved.

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