a
FEATURES
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
Ratiometric Conversion
Low Power Consumption: 300 mW typ
Dynamic Performance Set by User
High Max Tracking Rate 1040 RPS (10 Bits)
Velocity Output
Industrial Temperature Range Versions
Military Temperature Range Versions
ESD Class 2 Protection (2,000 V min)
/883 B Parts Available
APPLICATIONS
DC Brushless and AC Motor Control
Process Control
Numerical Control of Machine Tools
Robotics
Axis Control
Military Servo Control
GENERAL DESCRIPTION
Variable Resolution, Monolithic
Resolver-to-Digital Converter
AD2S80A
FUNCTIONAL BLOCK DIAGRAM
DEMOD
O/P
INTEGRATOR
I/P
AC ERROR
O/P
DEMOD
I/P
AD2S80A
SIN I/P
SIG GND
COS I/P
ANALOG
GND
RIPPLE
CLK
+12V
鈥?2V
DATA
LOAD
SC1
BYTE
SELECT
+5V
DIG GND
BUSY
SC2
DIR
ENABLE
A1
SEGMENT
SWITCHING
A2
R-2R
DAC
A3
PHASE
SENSITIVE
DETECTOR
INTEGRATOR
O/P
16-BIT UP/DOWN COUNTER
VCO DATA
TRANSFER
LOGIC
VCO I/P
OUTPUT DATA LATCH
16 DATA BITS
PRODUCT HIGHLIGHTS
Monolithic.
A one chip solution reduces the package size re-
quired and increases the reliability.
Resolution Set by User.
Two 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.
Ratiometric Tracking Conversion.
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.
Dynamic Performance 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. The 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.
Velocity Output.
An analog signal proportional to velocity is
available and is linear to typically one percent. This can be used
in place of a velocity transducer in many applications to provide
loop stabilization in servo controls and velocity feedback data.
Low Power Consumption.
Typically only 300 mW.
Military Product.
The AD2S80A is available processed in ac-
cordance with MIL-STD-883B, Class B.
MODELS AVAILABLE
Information on the models available is given in the section
鈥淥rdering Information.鈥?/div>
The 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.
The converter allows users to
select their own resolution and dy-
namic performance with external components.
This allows the users
great flexibility in defining the converter that best suits their sys-
tem requirements. The 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.
The AD2S80A converts resolver format input signals into a par-
allel natural binary digital word using a ratiometric tracking con-
version method. This ensures high-noise immunity and tolerance
of lead length when the converter is remote from the resolver.
The 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. BYTE
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.
An analog signal proportional to velocity is also available and
can be used to replace a tachogenerator.
The AD2S80A operates over 50 Hz to 20,000 Hz reference
frequency.
REV. A
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703
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