AD2S1205 Datasheet, PDF (1/25 Pages) Analog Devices – 12-Bit R/D Converter with Reference Oscillator

Preliminary Technical Data
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
12-Bit R/D Converter
with Reference Oscillator
AD2S1205
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.
AD2S1205
EXCITATION
OUTPUTS
FUNCTIONAL BLOCK DIAGRAM
REFERENCE
PINS
CRYSTAL
REFERENCE
OSCILLATOR
(DAC)
VOLTAGE
REFERENCE
INTERNAL
CLOCK
GENERATOR
SYNTHETIC
REFERENCE
INPUTS
FROM
RESOLVER
ADC
ADC
TYPE II TRACKING LOOP
FAULT
DETECTION
FAULT
DETECTION
OUTPUTS
ENCODER
EMULATION
OUTPUTS
ENCODER
EMULATION
POSITION REGISTER
VELOCITY REGISTER
MULTIPLEXER
DATA BUS OUTPUT
RESET
DATA I/O
Figure 1.
Rev. PrB_10/06
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