Modules
`
`Subsystems
`
`E ANALOG
`
`DEVICES
`
`s
`
`
`
`E
`
`‘
`
`Micro Motion 1043
`
`1
`
`Micro Motion 1043
`
`

`
`"ANALOG
`..... OEVICES
`DATA-ACQUISITION
`DATABOO_K 1984
`
`VOLUME II
`MODULES-SUBSYSTEMS
`
`PICTORIAL GUIDE TO PRODUCT CATEGORIES
`
`INPUT. TltANSDUC'.ERS
`T...,........
`1:8,0:9
`
`n-~13jaBoth
`V .......
`11:18 _ Seaioa 18 ill
`v_n
`
`General Information
`
`Table of Contents
`
`Ordering Guide
`
`Operational Amplifiers
`
`. Isolation Amplifiers
`-
`Analog Multipliers/Dividers
`
`RMS-to-DC Converters
`
`Log-Antilog Ampli'fiers
`Temperature Transducers &
`Signal Conditioners
`Digital-to-Analog Converters
`
`Analog-to-Digital Converters
`
`Voltage-Frequency Converters
`
`Synchro& Resolver Converters
`
`Sample/Track .. Hold Amplifiers
`
`Data Acquisition Subsystems
`
`Digital Panel Instruments
`
`Microcomputer Analog I/O Subsystems
`,..MAC
`Measurement-and-Control Subsystems
`MACSYM
`Measurement & Control Systems .
`Power Supplies
`
`2
`
`

`
`.... ANALOG
`"'OEVICES
`DATA-ACQUISITI,ON
`DATABOOK 1984
`
`VOLUME II
`MODULES-SUBSYSTEMS
`
`© Analog Devices. Inc .• 1984
`All Rights Reserved
`
`Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is as(cid:173)
`sumed 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.
`Specifications and prices shown in this Databookare subject to change without notice.
`PrQducts in this boc;>k may be covered by one or more of the following patents. Additional patents are pending.
`See individual data sheetsforfurther information:
`.
`U.S.: 3,007.114,3.278.736,3.355.670.3.441.913, 3.467.908, 3.500.218, 3.530,390. 3.533.002, 3,685,045, 3.729,660.
`3,747,088. 3.793,563. 3.803.590 •. 3.842,412. 3.868,583. 3.872.466. 3.887.863. 3.890.611. 3,906.486. 3.909.908.
`3.932.863. 3,940.760. 3,942,173, 3.946,324, 3.950,603. 3,961,326. 3.978;473. 3,979,688. 4,016,559, 4.020,486,
`4,029.974. 4,034,366. 4,054.829. 4,092,698, 4.123,698. 4,136.349, 4.141,004. 4,213,806. 4.250.445, 4,270.118.
`4.268.759. 4.286.225. 4.309.693. 4.313.083. 4.323.795. 4.338.591. 4.349.811. 4.363,024. 4.374.314. 4,383.222.
`4,395.647.4.399.345,4.400,689.4.400.690, DES 233.909. U.K.: 964.513. 1.310.591, 1.310.592, 1,364.233, 1,470,673,
`1,470.674. 1.537.542, 1,531.931. 1.571.869, 1.590.136. 1.590.137, 1,599,538, 2.008,876, 2,012.135. 2,032,659,
`. 2,040,087,2,050,740, 2;081,040. France: 70.10561,71.28952, 74.25263, 7~27557. 7601788.7608238 • .77 20799. 79
`24021.8000960.111833. West Ger(nany: 20 14034,2139 560, MR 9379. Italy: 933,798. Japan: 452,263, 1,092,928,
`1,101.824, 1,180,463. Canada: 984,015,1,006.236,1.025,558, 1,035,464, 1,054,248, 1.141,034, 1.141,820, 1,143,306,
`1,150.414. 1,153,607. 1.157,571. Sweden: 7603320-8.
`
`3
`
`

`
`rill ANALOG
`WDEVICES·
`
`. [owProfUe
`Synchro/Resolver-to-DigitaIConverter
`. SilC1700/1702/1104SERIES. I
`
`Extended temperature range versions of all the converters
`are available.
`.
`
`:ed
`:by
`,ing
`( i~
`livalent
`nna
`: an
`t
`
`t be
`ore
`uency
`oltage
`. the
`
`nee
`
`nee
`
`Ice
`
`Ice
`
`.ce
`
`nce
`
`ce
`
`FEATURES
`Internal Microtransformers for 60Hz, 400Hz and 2.ekHz
`ReferenC8$
`Low Profile (0.4")
`10,,12- or 14-Bit Resolution for 360°
`High Tracking~ates (75 revs/sec)
`Voltage Scaling with External Resistors (Unique, Featurel
`DC Voltage. Output Proportional to Angular VelQCity ..
`,Low Cost
`Lightweight 3oz. (85 grams.
`. MIL Spec/Hi Rei Options Available
`APPLICATIONS
`Servo Mechanisms
`Retransmission Systems
`Coordinate Conversion
`Antenna Monitoring
`Simulation
`Industrial Controls
`Fire Control Systems
`. Machine Tool Control Svstems.
`
`GENERAL DESCRIPTION
`The SDC1700, 'SOC1 702 and SDCl704 are. modular, contin(cid:173)
`uous tracking Synchro/Resolver-to-Digital Converters which
`employ a type 2 servo loop.
`They are intended for use.in both Industrial and Military
`applications.
`The input signals can be either; wire synchro plus referenee
`or 4 Wire resolver plus reference, depending on the option.
`The outputs will be presented in TTL compatible,parallel
`natural binary.
`
`One of the outstanding features of the converters is the lise
`of precision Scotr T andreferencemicrotransformers. This
`has made it possible to include the transformers within· the
`module, even on the 60Hz option, and yet still maintain
`. the profile height of 0.4".
`Particul¥ attention has been paid in the design, to achieving
`the highest tracking rates and accelerations possible,· com(cid:173)
`patible with the resolution and carrier frequency. used, while
`at the same time obtaining a high overal\accuracy.
`When SDC's are used in control loops, it is often useful to
`have a voltage which is proportional to angular velocity; This
`voltage is available and has been brought out on all the
`SDC 1700 converters.
`
`MODELS AVAILABLE
`The three. Synchro-to-Digital Converters described in this
`data sheet differ primarily in the. areas of reSolution, accu-
`. racy and dynamic performance as follows:
`Model SDC1702XYz"is a to-bit converter whichhasan
`overall ac~racy of ±22 arc-:minutes and a resolution, of 21
`arc-minutes.
`, Model SDCl700XYZ'is a 12-bit convener with- an overall
`accuracy of ±8.5 arc-minutes and a resolution of5.3 arc- .
`.
`.
`.
`min~tes.
`.
`.
`. Model SDC1704XYZ is a 14-bit converter with an overall
`accuracy of ±2.2 arc-minutes ±1LSB and a resolution of 1.3
`arc-minu tes.
`
`-
`
`.
`
`.
`
`The XYZ code defines the option thus: (~) signifies the
`operating, temperature range, (Y) signifies the reference fre(cid:173)
`quency, (Z) signifies the input voltage and range, and whether
`it will acceptsynchro or .resolver format.
`More informatiQn about the option code is given under the
`heading of "Ordering Information".
`
`NOTE
`For a1Ithe'standa:rd options, no· external transformers are needed
`with these c~verters.
`
`sYNCHRO lit RESOLVER CONVERtERS VOL II, 1a:-:49
`
`4
`
`

`
`SPECIFICATIONS (typical @+25°C unless otherwise noted)
`
`MODELS
`
`SDC1702
`
`SDC1700
`
`SD.CI704
`
`±22· arc-minutes
`±22· arc~minutes
`±22 arc~minutes
`10 Bits (lLSB
`2.1 arc-mins)
`10 Bits (Natural Binary)
`
`±S.5 arc~minutes
`:t8.S arc~minutes
`±8.S arc~minutes
`11 Bits (lLSB 5.3 arc-mins)
`12 Bits (Natural Binary)
`
`±2.'9 arc-minutes ±lLSB
`:12.2 are-minutes: .±lLSB
`±2.9 arc~minutes ±lLSB
`14 Bits (lLSB = 1.3 arc-mins)
`14 Bit. (Natural Binary)
`
`Soo·/sec
`12 Revolutions Per Second
`25 Revolutions Per Second
`
`520/sec'
`36,OOO/sec'
`
`±s%
`
`±ISV@3OmA
`+SV®8SmA
`1.3 Watt.
`2TTL Loads on
`All Options
`
`:130%
`
`9.0p.s
`2.0p.s
`L3p.s
`
`Hp.s
`3.Op..s
`0.8p.s
`
`Logic "0" 2 TTL Loads
`
`2TTL Loads SDC1 7006YZ
`4TTL Load. SDC17005YZ
`
`ACCURACY" (max error)·
`60Hz'
`400Hz
`
`OUTPur (In Parallel)
`SIGNAL AND REFERENCE
`FREQUENCY
`SIGNAL VOLTAGE (Line-to-Line)
`Low Level
`High Level
`SIGNAL IMPEDANCES
`Low Level
`. High Level
`REFERENCE VOLTAGE
`Low Level
`High Level
`REFERENCE IMPEDANCE
`
`TRANSFORMER ISOLA1'ION
`TRACKING RATE (min)
`60Hz
`400Hz
`2.6kHz
`Accel. l
`Constant Ka
`60Hz
`400Hz
`2.6kHz
`STEP RESPONSE
`(For lLSB Error)
`60Hz
`400Hz
`2.6kHz
`
`60Hz, 400Hz. 2.6kHz
`
`1l.8V rms
`90V rms
`
`26kn (Resistive) ..
`200kn (Re.istive)
`
`26V 0 l.8V Signal)
`llSV (90y Signal)
`270kn (lISV Signal)
`S6kn (26V Reference)
`(Impedance is Resistive)
`SOOV de
`
`5 Revolutions Per Second
`36 Revolutions Per Second
`i'S Revolutions Per Second
`
`1880/sec'
`
`Usee
`125m.
`sOms
`
`POWER LINES
`
`±ISV @ 25mA} ±S%
`+5V ® 70mA
`POWER DISSIPATION
`1.1 Watts
`2TTL LoadsSDCI7026YZ'
`DATA LOGIC OUTPUT'
`4TTL Loads SDC1702SYZ
`(TTL Compatible)
`BUSY LOGIC OUTPUT, POSITIVE PULSE: (l TTL Load)
`60Hz
`9.0p.s
`400Hz
`2.0p.s
`2.6kHz
`2.Op..
`MAX DATA TRANSFER TIME
`
`±30%
`
`60Hz
`400Hz
`2.6kHz
`
`INHIBIT INPUT (To Inhibit)
`WARM UPTIME
`TEMPERATURE RANGE
`Operating
`
`Storage
`
`DIMENSIONS
`
`WEIGHT
`
`Logic "0" 1 TTL Load
`1 sec to Rated Accuracy
`
`o to +70·C Standard
`-55·C to +10S·C Extended
`-SSoC to +12S·C
`
`3.125' x 2.62S" x 0.4"
`(79.4·x 66.7 x 1O.2mml
`3 ozs. (8 S grams)
`
`NOTES
`·Specifications same as SDC170Z.
`1 Specified over the appropriate operating tempcnu:ure ran&! of the option and for:
`~ (a) 1:: l~.signat and reference amplitude vari.tion (b) 10% signal and reference
`Harmonic Distortion (c) ±Sex, power supply variation (d) ±10% variation in reference
`f1<quency.
`1: It is re,commended that buHer, should be used if the above converters
`are required to drive ~ a distance greater t:han 6",
`Specifications subject to change without noti"-
`
`VOL. /I, 13-50 SYNCHRO & RESOLVER CONVERTERS
`
`5
`
`

`
`DATA TRANSFER (All Models)
`The· readiness of the converters for dataitransfer is indicated
`by the state of the BUSYpTIl.
`The voltag~ appearing on tl:te BUSY pin konsists of a trai~ of
`pulses, In TTL levels, of lengthaccording to ~e model ~nd
`option (see specification table). The converter is busy when
`the BUSY pin is at a TTL "High" level. These pulses corres(cid:173)
`pond to those delivered by the VCO to increment or decre(cid:173)
`merit the up-down coullter (see schematic diagra.lll). Thus
`the pulses will occur for increasing and decreasing counts.
`
`The most suitable time for transferring data is when the
`BUSY is at a logic "La" state, and· the times allowable for
`data transfer ~shown in the specification. Even at the
`maximum speed of the option, these times .. will. be sufficient •
`to transfer data before the next .BUSY pulse occurs;
`
`L-- WIDTH .DEPENDS ON OPTION
`, -
`AND MODEL ISEE SPEC)
`
`. INTERFACING WITH A COMPUTER
`It is recommended that external· latches are used to enable
`data to be transferred onto a computer data bus. One method
`is shown in the diagram. Using this method will mean that th~
`latcbes are constantly updated by the BUSY signal,while a~
`the same time enabling inputs to be made to the computer
`by means of normal data t{ansferprocedures. The AC175 5
`mounting card contains these external cOmponents.
`
`TO LATCHES
`
`TO COMPUTER INPUT PORT
`
`•
`
`74173
`TRI'&TATE
`LATCHES
`
`I
`
`DISTANCE DEPENDS
`
`I
`
`Suggested External Computer Interface Circuitry
`:----ON VELOCITY .--:-i.
`THEORY OF OPERAT.ION
`e~I~D~~~
`If the unit is a Synchro-to-Digital Converter, then the 3 wire
`synchre output will be connected to 51, 52 and sr on the
`module and the Scott T transformer pair will convert these
`signals into resolver format.
`VI K Eo Sin wt Sin 8
`i.e.,
`V2 K Eo Sin Wt Cos 8
`
`Data Transfer Diagram
`
`DATA TRANSFER DIAGRAM
`Taking the INHIBIT to a logic "Lo" state prevents the VCO
`(BUSY) pulses from updating the up-down counter. How(cid:173)
`ever, if applied during .. a BUSY pulse, the INHIBIT will not
`become effective until the end of the BUSY pulse.
`The best method of transferring the data is by applying the
`INHIBIT (taking it to a logic "Lo" state), waiting for at
`least the width of a BUSY pulse, transferring the data and
`releasing the INHIBIT.
`.
`Note that sustained application of the INHIBIT opens the
`internal control'loop and the convener may take on ap(cid:173)
`preciable time to recover to full accuracy when the loop
`is restored.
`' .
`'.
`.'.
`
`Where 8 is the ~gle of the Synchro Shaft.
`If the unitis a Resolver-to-Digital Convener, then the 4 wire
`resolver output will be connected to SI, 52, 53 and S4 on
`the module and the microtransformer will act purely as an
`i so l a to r . '
`.
`
`To understand the conversion process, then assume that the
`current word state of the up-downcounter is tP.
`The VI is multiplied by Cos tP and V2 is multiplied by Sin tP
`to give
`K Eo Sin Wt Sin 8 Cos tP .
`and K Eo Sin wt Cos.8 Sin tP
`
`RHI
`
`REf -
`
`RLO
`S1 "--''----'
`
`S2
`sa
`S4 0----
`
`MICRO ..
`TRANS·
`• FORMERS
`
`PHASE
`SENSITIVE
`DETECTOR
`
`SIN (8
`
`II)
`
`INHIBIT o--+_------l
`
`HIGH
`DYNAMIC
`RANGE VCO
`
`FREOUENCY
`SHAPING
`
`"---.... -_.-1' BUSY
`
`VEL
`
`DIGITAL
`OUTPUT WORD
`Functional Diagram of the SDC170012/4Converters
`
`SYNCHRO& RESOLVER CONVERTERS VOL. II, 13-51
`
`6
`
`

`
`These signals are subtraCted by the error amplifier to give:
`K Eo Sin wt (Sin () Cos f/J Cos 8 Sin ¢)
`or K Eo Sin wt Sin (8 - ¢)
`A phase sensitive detector, integrator and Voltage Controlled
`Oscillator (VCO) form a closed loop system which seeks to
`null Sin (8 - f/J).
`When this is accomplished, the word state of the up-down
`counter (¢), equals within the rated accuracy of the con(cid:173)
`verter, the synchro shaft angle 8.
`CONNECTING THE CONVERTER
`The electrical connections to the converter are straightfor(cid:173)
`ward. The power lines, which must not be reversed, are ±lSV
`and SV. They must be connected to the "±15V" and "sv"
`pins with the .commdn connection to the ground pin GND.
`
`It is suggested that O.lJ.lF and 6.8J.1F capacitors be placed in
`parallel from +15V to GND, from -15V to GND and from
`+5V to GND.
`The digital. output is taken from pins:
`1 through to 10 for the SDC1702
`1 through to 12 for the SDC1700
`1 through to 14 for the SDCI704
`Pin 1 represents the MSB in each case; The reference con(cid:173)
`nections are made to pins "RHI" and '·~o".
`In the case of a Synchro, the signals are connected to "51",
`"52" and "53" according to the following convention:
`S3 = ERLO RHI Sin wt Sin 8
`ES1
`Es3 _ S2 = ~LO RHI Sin wt Sin (8 + 120°)
`Es2 - Sl ERLO RHI Sin wt Sin (8 + 240°)
`For a resolver, the signals are connected to "51 ", "52",
`"53" and "54" according, to the following convention:
`
`53 =ERLO _ RHI Sin Wt Sin 8
`Es1
`ES2 :.. S4 = ~HI _ RLO Sin wt Cos 8
`
`The analog voltage representing velocity is available between
`"VEL" and "GND".
`The "BUSY" and "INHIBIT" pin (if used), should be con(cid:173)
`nected as described under the heading "Data Transfer".
`NOTE: If the INHIBIT pin is used (Le., driven to 0 volts),
`the control loop will be opened and a·finite time will be
`required (see spec) for the converter to recover.
`OUTLINE DIMENSIONS AND
`PIN CONNECTION DIAGRAM
`Dimensions are shown in inches and (mm).
`
`"
`
`54 PIN PRESEI\IT
`FOR RESOt. VI: R
`ONLYiROCf
`
`NOTE
`A60:Ve DtAGRAM ILlUSTflAl£S t;ONkECTtONS FOA SOCl7U4.
`FOR soe1700. PINS 13 AND 14 ARE OMITTEO. Pf!Ii 12 IS lS8
`FOR SOCl702, PINS 11. 12; 13,14 ARe OM1TrED. PIN. to IS lSB
`
`MATING SOCKET, CAMBION 450-3388-1)1-1)3
`
`VOL. 1/, 13-52 SYNCHRO ill RESOLVER CliNVERTERS
`
`RESISTIVE SCALING OF INPUTS
`A unique feature of the SDC1700 series of converters is that·
`the inputs can b<;. resistively scaled to accommodate any range·
`of input signal and reference voluges.
`This means that a standard converter can. be used with a
`personality card in systems where a: wide range· of input and
`reference voltages are encountered. In addition it should be
`noted that a 400Hz unit will operate from a 2.6kHz reference.
`It will however have the velocity and acceleration character(cid:173)
`istics as specified for the 400Hz converter. A 60Hz converter
`will operate "fr~m a 400Hz reference and will have the veloc(cid:173)
`ity and acceleration characteristics as specified for the 60Hz
`converter.
`To calcula1'ethe values of the external scaling resistors for a
`synchro converter, add l.11k.n in series with 51, S2 and 53
`per extra volt in the case of the signal, and 2.2k.n in the case
`of the reference. In the case of a resolver converter add
`2.22k.n per extra volt in series with S 1 and S2 for the signal
`and 2.2k.n per extra volt in series with RHI for the reference.
`For example, aSSUme that we have an 11.8 volt line to line
`signa1!26.0 volt reference converter, and we wish to use a
`60 volt line to line signal with a 115 volt reference.
`Thus in each signal input line, tfie extra voltage capability
`required is:
`60 - 11.8 = 48_2 volts
`Therefore each resistor needs to have a value of 48.2 x
`1.11 = S3.5k.n. In the case of the reference, the extra volt(cid:173)
`age capability required is:
`115 - 26.0 = 89 volts
`. Therefore the resistor needs to have a value of:
`89.0 x 2.2 19S.8k.n
`Thus the inputs can .be scaled as in the diagram below.
`
`6OVL .... {
`tNPUT
`
`115VoEF{
`
`R3
`
`R2
`
`RI
`
`""
`
`53
`
`S2
`
`SI
`
`soc
`
`n.SY SIGNAL
`28VAEF
`
`.... 0
`
`"",
`
`R1. R2. R3 • 53.SkU
`RF
`'" 195.8krl
`
`NOTE
`IN THE CASE "OF R1, R2 AND R3, THE RATIO ERRORS
`BETWEEN THE REStSTANCES tS MORE lMPORTANT
`THAN THE ABSOLUTE RESISTANCE VAlUES.
`
`IN GENERAL A ,~ RATIO ERROR WiLL GIVE fUSE
`TO AN EXTRA INACCURACY OF;11 ARCMINUTES
`WHILE A RATtO ERROR OF 0.1% WILL GIVE RISE
`TO AN EXTRA iNACCURACY OF 1.1 ARC-MINUTES,
`
`THE ABSOLUTE VALUE OF RF IS NOT CRITICAL.
`
`ees
`
`Bit Number
`1 (MSB)
`2
`3
`4
`5
`6
`7
`8
`9
`10 (LSB for SDC1702)
`11
`12. (LSB for SOC 1700)
`13
`14 (LSB for SDC17Q4)
`
`BIT WEIGHT TABLE
`Weight in D
`180.0000
`90.0000
`45.0000
`22.5000
`11.2500
`5.6250
`2.8125
`1.4063
`0.7031
`0.3516
`0.1758
`0.0879
`0.0439
`0.0220
`
`.
`
`v
`g
`a
`
`}
`fi
`T
`tI
`
`Dii.
`SD
`for
`
`Di~
`an f
`
`7
`
`

`
`VEWCITY PIN
`'\
`This pin provides a voltage output which is proportional to
`the angular velocity of the input. The voltage. goes negative
`for an increasing digital angle and goes positive for a de(cid:173)
`creasing digital angle.
`The.characteristics of the velocity pin output are given in
`the table below.
`
`APPLICATIONS OF SYNCHRO-TO-DIGITAL
`CONVERTERS
`SOC::;s can be JlSedin a variety of ways in control loops as.
`well as for the conversion of angular data into a form which
`is readily acceptable to digital displays or computers.
`'
`The diagram below shows an SOC being used ina digitally
`controlled feedbaCk loop ..
`
`SCaling of output Voltage
`for One Fifth max, Velocity
`Output Voltage Temp. Coeff.
`
`Output Voltage Drift (All Models)
`
`Linearlty:
`
`Noise: (0 to ,20Hz)
`
`2Volu (Nominal)
`
`O.OS%I"C of
`Output
`o (Q + 70Q C
`±50PVj~C
`-55~C to +105°C
`:tlOOpV/C
`&$I:;;C to 8001'1 Is«: SDC1704
`400Hz 1%
`Otsec to 100° lsec SDC 1704
`60Hz 1%
`'.
`O/se< to SOOolsec SDCI100/2
`400Hz 2%
`&'tsee to 1000 lsec SDC1700/2
`60Hi 1.5%
`@1600'I .. cSDC17ooI214
`400Hz. 2mV'rms
`@200' Iseo SDC 1700/2/4
`60Hz. 2mV rIDS
`
`Impedan<e (Output)
`max Current Available
`ImA
`The velocity voltage can be used.in closed loop servo systems
`for stabilization instead of a tachometer.
`The SOC1700/214 velocity outputs do not have the disad(cid:173)
`vantages of being inefficient at low speeds and do not need
`gearing required by tachometers. In addition, the output is
`available at no extra COSt.
`For other velocity output scaling'and linearity consult the
`factory.
`.
`
`Two examples of the use of the velocity pin are shown in
`the diagram below.
`
`DEMANDED YELOCITY
`
`~4~
`
`":-y-t"-'
`
`REF {
`
`FINE {
`DATA
`
`2 SPEED
`SVNCHRO
`DEMAND
`
`{
`
`COARSE {
`DATA
`
`.
`
`AERIAL,"
`GUN
`MOUNTING
`ETC
`
`Diagram showing a velocity feed forward application. The
`SOC is used to produce the demanded velocity from Synchro
`form inputs.
`
`INI>UT'
`
`REF
`
`I
`
`, ,
`I GE~"NG I
`---~------0~
`
`TO LOAD
`
`Diagram showing the velocity voltage being used to stabilize,
`an electro·mechanicar control loop
`
`C£MANDEO
`DIGITAL ANGLE ~I)
`
`~·-:--,---6MOTOR
`~OLOAD
`
`An SOC Being Used in a Digitally Controlled
`Feedback Loop
`, .
`
`Such loops as shown in the diagram above require .the high
`dynamic performance of the SOC1700 series converters. It
`should be noted that in this application, the SOC 1700 series
`will replace conventional tachometers and phase sensitive
`detectors while at the same time provide' digital position
`feedback.
`Many synchro systems employ a tWO speed, geared arrange(cid:173)
`ment utilizing onesynchro for the fine'shaftand one for the
`coarse. An example of .this type is shown below ..
`
`lNPUT MECHANtcAl
`ANGLE
`I
`I
`I
`
`I
`GEARING
`I
`RAllO N
`~_ I HI
`
`REf
`
`(slOWI
`
`REF
`
`(FAST)
`
`~~~::~--~::~,..
`.,: -~ "'~
`
`uP TO 7 BITS
`
`uP r.o J4 BITS
`
`UP TO 19BJts
`OVTf'uT
`Diagram Showing Coarse/Fine Synchro ProceS$()r
`System
`In the above example, two tracking SOC's are being used to
`provide data for coarse/fine (two speed) data transmission
`systems.
`
`The TSL1612 is a processor which combines the outputs of
`two SOC's to provi4e one output word of up to 19 bits in
`length.
`The TSL1612 is available for any ratio between 2: 1 and 36: 1
`and provides automatic compensation for misalignment of the
`coarse synchro relative to its shaft. It also corrects for any
`overlap between the digits of the coarse and fine shafts.
`
`SYNCHRO & RESOLVER CONVERTERS VOL. II, 13-53
`
`8
`
`

`
`MEAN TIME BETWEEN FAILURES (M.T.B.F.)
`The estimated mean time between failures is given as follows:
`SDC170012
`174,000 Hours
`SDC1704
`167,000 Hours
`Further information relating to M.T.B.F. and to the quality
`control and test procedures employed by us can be obtained
`from the factory on request.
`
`TRANSFER FUNCTION
`The transfer function of the SDC1700/2 and SDC1704,
`400Hz versions, is given below.
`For the transfer functions of the other models or for a de(cid:173)
`tailed analysis of those given here, please contact us.
`SDC1700/2 400Hz
`S.SX10?(1+6.SXlO-3s)
`80
`'ii;' = s3 + S.04 XI02s2 + 6.1 X 105 s:':+-s-'.:.!.S-X-1-0-?--
`SDC1704400Hz
`
`80
`
`2.9.5 X 10?(1+S.2X 10-3s) -----
`
`81
`s3 +8.05 X 102S2 + 1.9.5 X 105 s+ 2.9.5 X 10'
`CARD MOUNTING
`All the converters can be mounted on an AC1755 mounting
`card.,This card contains the latches described under the "Data
`Transfer" heading, which are necessary to transfer the data on
`to a compu ter bus system, and sockets for the converter.
`The latches have a tri-state output'to facilitate ease of use.
`The AC175 S also contains facilities for the inclusion of in(cid:173)
`put signal and reference scaling resistors as described under
`the heading "Resistive Scaling of Inputs".
`
`The card uses a 22122 0.156" pitch edge connector. The pin
`out is shown below. If it is not required to use the external
`latches, they can be jumpered on the board.
`
`AC17SS MOUNTING CARD
`Dimensions shown in inches and (mm).
`
`First Angle
`Projection
`
`.. ~~ ~-, ~~ ......
`
`L
`o.HfiUlil r-
`
`-j.J:;U1J
`
`EDGE CONNECTIONS AC17H
`Ed;< !'in
`...... n
`Numb«
`Letter
`I
`
`•
`
`l
`4
`S
`6
`8
`Il
`IS
`
`Fll1Ictino
`F'vtu:ritm
`R (La)
`Tri-Sutc Enable
`A
`F
`R(Hi)
`+lSV
`53
`H
`+15V
`sz
`J
`~lSV
`51
`K
`-l$V
`GND
`L
`S4
`VEL
`M
`GND
`BUSY
`+SV
`N
`' P
`INHIBIT
`+SV
`BIT 14
`BIT 7
`T
`BIT 6
`BIT IJ
`U
`BlT 12
`V
`BJT 5
`w
`BIT 11
`BIT 4
`BIT 10
`BIT l
`X
`. BIT .2
`BIT 9
`Y
`BIT 8
`BIT 1 .
`Z
`NOTE: SDC11014oc:! IlOt \lSt: PiIU 16.17, U-orI9. SDC1700 docs CO/: UK piaa 16 and 17.
`
`,.
`••
`
`17
`
`'9
`20
`Z,
`22
`
`ORDERING INFORMATION
`Parts should be ordered by the appropriate part number (i,e.,
`
`VOL. II- 13-54 SYNCHRO & RESOLVER CONVERTERS
`
`SDC17oo, SDC1702, SDC1704) followed by the appropriate
`XYZ option code.
`If the unit is to be a Resolver-to-Digital Converter, the SOC
`should be replaced by ROC in the part number.
`The XYZ options are as follows:
`X signifies the operating temperature range and the options
`are:
`X = 5 signifies 0 to +70°C (commercial) temperature.
`X = 6 signifies -55°C to +105°C (extended) temperature.
`Y signifies the reference frequency and the options are:
`Y
`1 signifies 400Hz
`Y = 2 signifies 60Hz *
`Y = 4 signifies 2.6kHz
`Z signifies the input signal and reference voltages and
`whether the converter is an SDC or an RDC. The options are:
`
`Z 1 signifies synchro, signal 11.SV rms, reference 26V rms
`Z = 2 signifies synchro, signal 90V r!Ds, reference 115V rms
`Z = 3 signifies resolver, signal !l.8V rms, reference 11.SV rms
`Z = 4 signifies resolver, signal 26V rms, reference 26V rms
`Z = 8 signifies resolver, signal n.sv rms, reference 26V rms
`
`Thus, for example, an SDC1704 with a commercial (0 t'o
`+70oC) operating range, using a 400Hz, 26V reference with
`an B.SV signal would be ordered as an SDC1704511.
`For other than these options, consult the factory,
`
`CAUTIONS
`Do not reverse the power supplies,
`Do not connect signal andlor reference inputs to other than
`S1, S2, S3, 54, ~I or Rw.
`Do not connect signals andlor references to a lower vol tllge
`rated converter. (Such as a 115V Synchro into a 26V Con(cid:173)
`verter).
`Misconnections as per the above will damage the units and
`void the warranty.
`
`OTHER PRODUCTS
`The SOC1700/214 converters are just a few of the modules
`and instruments concerned with Synchro and Resolver con(cid:173)
`version manufactured by us.
`Other products are listed below and technical data is avail(cid:173)
`able. If you have any questions about our products, or
`require advice about the use of them for a particular applica(cid:173)
`tion, please contact our Applications Engineering Department.
`TWO SPEED PROCESSORS
`Which utilize the digital outputs of two SDCs in a 2 speed
`coarse/fine system to produce one combined digital word of
`up to 19 bits in length. The TSL1612 in particular is available
`for any ratio between 2: 1 and 36: L
`.
`
`DIGIT AL·TO-SYNCHRO CONVERTERS
`ResolutIons of between 10 and 14 bits are available.
`BCD OUTPUT SYNCHRO-TO-DIGlTAL CONVERTERS
`The SBCD1752 and SBCD1753 are converters with a BCD
`instead of a binary output based upon the SDC1700. They
`have outputs of ±1S0.0 degrees and 0 to 360.0 degrees
`respectively.
`
`• 50Hz Ol!erlltiQn
`For 50Hz operation, a 60Hz converter can be used with no
`reducaon in accuracy.
`
`I:
`[
`
`FEj
`Higl
`16-E
`Thr.
`Simi
`Inte
`Con'
`Exu
`APP
`Repl
`Test
`Serv.
`AntE
`Simu
`Artil
`
`GENE]
`The Sr:
`tracki.n;
`State lal
`Loop 31
`The inp
`or4wi!
`outputs
`binary, I
`The thr!
`of more
`the "INI
`verter 10
`The SD(
`Standard
`isolation
`The COOl
`compom
`MODELl
`Options.
`Synchro
`temperat
`
`More infl
`ingcodei
`
`9