AD2S44TM14B Analog Devices Inc, AD2S44TM14B Datasheet

AD2S44TM14B

Manufacturer Part Number

AD2S44TM14B

Description

IC SYNC-R/D CONV 14BIT 2CH 32DIP

Manufacturer

Analog Devices Inc

Type

R/D Converterr

Datasheet

1.AD2S44-TM11B.pdf (12 pages)

Specifications of AD2S44TM14B

Rohs Status

RoHS non-compliant

Resolution (bits)

14 b

Data Interface

Parallel

Voltage Supply Source

Dual ±

Voltage - Supply

±14.25 V ~ 15 V

Operating Temperature

-55°C ~ 125°C

Mounting Type

Through Hole

Package / Case

32-CDIP (0.900", 22.86mm)

Sampling Rate (per Second)

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FEATURES

Low per-channel cost

32-lead DIL hybrid package

2.6 arc minute accuracy

14-bit resolution

Built-in test

Independent reference inputs

High tracking rate

APPLICATIONS

Gimbal/gyro control systems

Robotics

Engine controllers

Coordinate conversion

Military servo control systems

Fire control systems

Avionic systems

Antenna monitoring

CNC machine tooling

GENERAL DESCRIPTION

The AD2S44 is a 14-bit dual channel, continuous tracking synchro/

resolver-to-digital converter. It has been designed specifically

for applications where space, weight, and cost are at a premium.

Each 32-lead hybrid device contains two independent Type II servo

loop tracking converters. The ratiometric conversion technique

employed provides excellent noise immunity and tolerance of

long lead lengths.

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 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.

S1 (A)

S2 (A)

S3 (A)

S4 (A)

S1 (B)

S2 (B)

S3 (B)

S4 (B)

(A)

(B)

CONDITIONER

REFERENCE

RESOLVER

SYNCHRO/

AD2S44

MULTIPLIER

SIN/COS

SPEED

HIGH

FUNCTIONAL BLOCK DIAGRAM

ERROR

AMP

Synchro/Resolver-to-Digital Converter

DETECTION

BUILT-IN

TEST

DETECTOR

Figure 1.

SENSITIVE

PHASE-

Low Cost, 14-Bit, Dual Channel

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

Tel: 781.329.4700

Fax: 781.461.3113

The core of each conversion is performed by state-of-the-art mono-

lithic, integrated circuits manufactured by the Analog Devices, Inc.,

proprietary BiMOS II process, which combines the advantages of

low power CMOS digital logic with bipolar linear circuits. The

use of these ICs keeps the internal component count low and

ensures high reliability.

The built-in test ( BIT ) facility can be used in failsafe systems to

provide an indication of whether the converter is tracking

accurately.

Each channel incorporates a high accuracy differential condi-

tioning circuit for signal inputs providing more than 74 dB of

common-mode rejection. Options are available for both synchro

and resolver format inputs. The converter output is via a three-state

transparent latch allowing data to be read without interruption of

the converter operation. The A/ B and OE control lines select the

channel and present the digital position to the common data

outputs.

The AD2S44 also features independent reference inputs where

different reference frequencies can be used for each channel.

All components are 100% tested at −55°C, +25°C, and +125°C.

Devices are processed to high reliability screening standards

and receive further levels of testing and screening to ensure

high levels of reliability.

INTEGRATOR

VCO

UP-DOWN

COUNTER

UP-DOWN

COUNTER

LATCHES

OUTPUT

THREE-

STATE

A/B

DB1 (LSB)

DB14 (MSB)

GND

–V

BIT

AD2S44

www.analog.com

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AD2S44TM14B Summary of contents

Page 1

FEATURES Low per-channel cost 32-lead DIL hybrid package 2.6 arc minute accuracy 14-bit resolution Built-in test Independent reference inputs High tracking rate APPLICATIONS Gimbal/gyro control systems Robotics Engine controllers Coordinate conversion Military servo control systems Fire control systems Avionic systems ...

Page 2

AD2S44 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagram .............................................................. 1 Table of Contents .............................................................................. 2 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 Absolute Maximum Ratings ............................................................ 5 ESD Caution .................................................................................. 5 ...

Page 3

SPECIFICATIONS V = ± 25°C, unless otherwise noted Table 1. Parameter PERFORMANCE 1 Accuracy 2 AD2S44-UMB 2 AD2S44-TMB Tracking Rate Resolution (1 LSB = 1.3 Arc Minutes) Repeatability Signal/Reference Frequency Bandwidth SIGNAL INPUTS Signal ...

Page 4

AD2S44 Parameter DATA TRANSFER Time to Data Stable (After Negative Edge Change of Level of A/B) Time to Data in High Impedance State (After Positive Edge of OE) Time for Repetitive Strobing of Selected Channel BUILT-IN TEST ...

Page 5

ABSOLUTE MAXIMUM RATINGS Table 2. Parameter +V to GND S –V to GND S Any Logic Input to GND Any Logic Input to GND Maximum Junction Temperature 1 S1, S2, S3, S4 Pins (Line-to-Line Option 11.8 V Option ...

Page 6

AD2S44 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 3. Pin Function Descriptions Pin No. Mnemonic DB8 to DB14 (LSB A/B 10 BIT (A) ...

Page 7

THEORY OF OPERATION The AD2S44 operates on a tracking principle. The output digital word continually tracks the position of the synchro/resolver shaft without the need for external convert commands and status wait loops. As the transducer moves through a position ...

Page 8

AD2S44 OUTPUT ENABLE (OE the output enable input; the signal is active low. When set to Logic 1, DB1 to DB14 are in high impedance state. When OE is set to Logic 0, DB1 to DB14 represent the ...

Page 9

SCALING FOR NONSTANDARD SIGNALS A feature of these converters is that the signal and reference inputs can be resistively scaled to accommodate nonstandard input signal and reference voltages that are outside the nominal ±10% limits of the converter. Using this ...

Page 10

AD2S44 K does not define maximum acceleration; it defines only the a error due to acceleration. The maximum acceleration of which the AD2S44 keeps track is approximate to 5 × about 800 revolutions/sec . K can be ...

Page 11

OUTLINE DIMENSIONS 0.225 (5.72) MAX 0.192 (4.88) 0.152 (3.86) 0.025 (0.64) MIN 0.023 (0.58) 0.014 (0.36) ORDERING GUIDE Model Temperature Range AD2S44–TM11B −55°C to +125°C AD2S44–TM12B −55°C to +125°C AD2S44–TM18B −55°C to +125°C AD2S44–UM18B −55°C to +125°C ORDERING INFORMATION When ...

Page 12

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