REV. A

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a

Variable Resolution, Monolithic

Resolver-to-Digital Converter

AD2S80A

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

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.

FUNCTIONAL BLOCK DIAGRAM

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

“Ordering Information.”

AD2S80A

SEGMENT

SWITCHING

R-2R

DAC

A3

A1

A2

PHASE

SENSITIVE

DETECTOR

VCO DATA

TRANSFER

LOGIC

OUTPUT DATA LATCH

16-BIT UP/DOWN COUNTER

SIN I/P

SIG GND

COS I/P

ANALOG

GND

RIPPLE

CLK

+12V

–12V

DATA

LOAD

16 DATA BITS

INTEGRATOR

O/P

VCO I/P

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703