Variable Resolution, Monolithic
Resolver-to-Digital Converter
a
AD2S80A
FEATURES
FUNCTIO NAL BLO CK D IAGRAM
Monolithic (BiMOS ll) Tracking R/ D Converter
40-Pin DIP Package
44-Pin LCC Package
10-,12-,14- and 16-Bit Resolution Set by User
Ratiom etric Conversion
Low Pow er Consum ption: 300 m W typ
Dynam ic Perform ance Set by User
High Max Tracking Rate 1040 RPS (10 Bits)
Velocity Output
Industrial Tem perature Range Versions
Military Tem perature Range Versions
ESD Class 2 Protection (2,000 V m in)
/ 883 B Parts Available
AD2S80A
A1
A2
SIN I/P
A3
INTEGRATOR
O/P
SIG GND
R-2R
DAC
SEGMENT
SWITCHING
PHASE
SENSITIVE
DETECTOR
COS I/P
ANALOG
GND
RIPPLE
CLK
VCO DATA
TRANSFER
LOGIC
16-BIT UP/DOWN COUNTER
OUTPUT DATA LATCH
VCO I/P
+12V
–12V
APPLICATIONS
DC Brushless and AC Motor Control
Process Control
DATA
LOAD
16 DATA BITS
Num erical Control of Machine Tools
Robotics
Axis Control
Military Servo Control
P RO D UCT H IGH LIGH TS
Monolithic. A one chip solution reduces the package size re-
quired and increases the reliability.
GENERAL D ESCRIP TIO N
T he AD2S80A is a monolithic 10-, 12-, 14- or 16-bit tracking
resolver-to-digital converter contained in a 40-pin DIP or 44-
pin LCC ceramic package. It is manufactured on a BiMOS II
process that combines the advantages of CMOS logic and bipo-
lar high accuracy linear circuits on the same chip.
Resolution Set by User . T wo control pins are used to select
the resolution of the AD2S80A to be 10, 12, 14 or 16 bits al-
lowing the user to use the AD2S80A with the optimum resolu-
tion for each application.
Ratiom etr ic Tr acking Conver sion. Conversion technique
provides continuous output position data without conversion
delay and is insensitive to absolute signal levels. It also provides
good noise immunity and tolerance to harmonic distortion on
the reference and input signals.
T he converter allows users to select their own resolution and dy-
namic performance with external components. T his allows the users
great flexibility in defining the converter that best suits their sys-
tem requirements. T he converter allows users to select the reso-
lution to he 10, 12, 14 or 16 bits and to track resolver signals
rotating at up to 1040 revs per second (62,400 rpm) when set to
10-bit resolution.
D ynam ic P er for m ance Set by the User . By selecting exter-
nal resistor and capacitor values the user can determine band-
width, maximum tracking rate and velocity scaling of the
converter to match the system requirements. T he external com-
ponents required are all low cost preferred value resistors and
capacitors, and the component values are easy to select using
the simple instructions given.
T he AD2S80A converts resolver format input signals into a par-
allel natural binary digital word using a ratiometric tracking con-
version method. T his ensures high-noise immunity and tolerance
of lead length when the converter is remote from the resolver.
T he 10-, 12-, 14- or 16-bit output word is in a three-state digi-
tal logic available in 2 bytes on the 16 output data lines. BYT E
SELECT , ENABLE and INHIBIT pins ensure easy data trans-
fer to 8- and 16-bit data buses, and outputs are provided to al-
low for cycle or pitch counting in external counters.
Velocity O utput. An analog signal proportional to velocity is
available and is linear to typically one percent. T his can be used
in place of a velocity transducer in many applications to provide
loop stabilization in servo controls and velocity feedback data.
Low P ower Consum ption. T ypically only 300 mW.
An analog signal proportional to velocity is also available and
can be used to replace a tachogenerator.
Militar y P r oduct. T he AD2S80A is available processed in ac-
cordance with MIL-ST D-883B, Class B.
T he AD2S80A operates over 50 Hz to 20,000 Hz reference
frequency.
MO D ELS AVAILABLE
Information on the models available is given in the section
“Ordering Information.”
REV. A
Inform ation furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assum ed by Analog Devices for its
use, nor for any infringem ents of patents or other rights of third parties
which m ay result from its use. No license is granted by im plication or
otherwise under any patent or patent rights of Analog Devices.
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Tel: 617/ 329-4700
Fax: 617/ 326-8703