SBCD1752

SBCD1752_15 AD | Alldatasheet

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~ ANALOGW DEVICES I

FEATURES

BCD (BinaryCoded Decimal)Output Representing0 to 359.9° or 0 to t179.9° -15V Power Supply Requirement Optional High TrackingRate (75 revs/sect InternalMicrotransformersfor60Hz, 400Hz and 2.6kHz Options VoltageScalingwith ExternalResistors(UniqueFeature) TransformerIsolatedOutputs Low Cost MI L Spec/HiRei OptionsAvailable

APPLICATIONS

VisualDisplayof Angular Information ValvePositionIndication Antenoa Monitoring IndustrialControls GENERAL DESCRIPTION The SBCDI752, SBCDI753, SBCD1756 and the S~CD1757 aremodular, continuous trackingSynchro/Resolver-to-Digital converterswhich employ a type 2 servo loop. They are intended for use in both Industrialand Military applicationseitherfor displayingangular data directly,or for inputtingBCD information directlyinto a data processing system. The input signalscan be either3 wire synchro plus reference or 4 wire resolverplus reference,depending on the option. The ou tputswillbe presented inparallelBinary Coded Decimal (BCD). Particularattentionhas been paid in the design,to achieving the highesttrackingratesand accelerationspossible,com- patiblewith the resolutionand carrierfrequency used, while at the same time obtaining a high overallaccuracy. One of the outstanding featUresof these convertersisthe use made of precisionScott T and referencemicrotransformers. This has made itpossibleto include the transformerswithin the module, even for the 60Hz versionas well as providing facilitiesfor externalvoltagescaling. MODELS AVAILABLE The four Synchro-to-Digitalconvertersdescribed inthisdata sheet,differprimarilyin the areasof output format and power supply requirements. Model SBCD1752XYZ isa 13-bitplus sign.BCD output con- verter,giving-180.0° to -0.1° and +0.0 to +179.9° requiring tIS V and +5 V power supplies,and having an overallaccuracy of :to.2Degrees. BCD Output Synchro-to-0igitalConverters SBCD1752/1753/1756/1757I Model SBCD1753XYZ isa 14-bit,BCD output converter, giving0 to 359.9°, requiringt15V and +5V power supplies, and having an overallaccuracy of to.2 Degrees. Model SBCD1756XYZ isa 13-bitplus'sign,BCD output con- verter,giving-180.0° to -0.1° and +0.0 to +179.9" requiring +15V and +5V power supplies,and having an overallaccuracy of to.2 Degrees. Model SBCD1757XYZ isa 14-bit.BCD output converter, giving0 to 359.9°, requiring+15V and +5V power supplies, and having an overallaccuracy of :to.2Degrees. The XYZ code definesthe option thus: X signifiesthe operating temperature range. Y signifiesthe referencefrequency. Z signifiesthe input voltage and range and whether itwill accept Synchro or Resolver information. More information about the option code isgiven under the heading "Ordering Information". DATA TRANSFER (ALL MODELS) The readinessof the convertersfor data transferisindicated by the stateof the BUSY pin. The voltage appearing on the BUSY pin consistsof a trainof pulses,atTTL levels,of length according to the option (see Specificationstable).The con- verterisbusy when the BUSY pin isat TTL "High" level.The pulsesoccur for increasingand decreasingcounts. The most suitabletime for transferringdata is400ns afterthe tra:lingedge of the BUSY pulse,and the times allowable for data transferare shown in the specification.Even at the maxi- mum speed of the option, these times willbe sufficientto transferdata before the next BUSY pulse occurs. II - - SYNCHRO & RE~OLYER CONVERTERS VOL. II.13-41 OBSOLETE

" LUll IU" IIUI1I" (typicalat25uCunlessotherwisestated) MODELS ACCURACY' (max Error) All Frequency Options OUTPUT RESOLUTION SBCDI7S2 :to.2Degrees ParallelBCD, 8TTL Loads J3-Bit+ Sign Representing -180.0° to -0.1° and +0.0° to + 179.9° SBCDI753 SBCD1757SBCD1756

14 Bit Representing

0 to 359.9° SIGNAL AND REFERENCE FREQUENCY SIGNAL VOLTAGE (Line to Line) Low Level 11.8V rms High Level 90.0V rms SIGNAL IMPEDANCES Low Level High Level REFERENCE VOLTAGE Low Level High Level REFERENCE IMPEDANCE Low Level High Level TRANSFORMER ISOLATION TRACKING RATE" (min) 60Hz 400Hz 2.6kHz Accel.I Constant Ka 60Hz 400Hz 2.6kHz STEP RESPONSE (179° Step) (For 0.1° Error) 60Hz 400Hz 2.6kHz' POWER LINES POWER DISSIPATION 60Hz, 400Hz and 2.6kHz 26HZ (Resistive) 2ookil (Resistive) 26V (11.SV Signal) 115V (90V Signal) 56kil (Resistive) 270HZ (Resistive) 500V dc

5 Revolutions Per Second

36 RevolutionsPer Second

75 Revolutions Per Second

120.oo0/sec2 6oo,ooO/sec2 1.5sec 125ms 5Oms +15V@25mA -15V @ 25mA +5V @ 50OmA

3.25 Watts

BUSY LOGIC OUTPUT, POSITIVE PULSE (1 TTL Load) 60Hz 3.5 to 4.5/.1s 400Hz 0.5 to 1.25/1s 2.6kHz 0.5 to 1.25/.1s MAX DATA TRANSFER TIME (From 400ns After TrailingEdge of BUSY at max Velocity) 60Hz 400Hz 2.6kHz iNillBi'fINPUT (To Inhibit) TEMPERATURE RANGE Operating Storage DIMENSIONS WEIGHT 4o,.ts 5.0/ls I.S/ls Logic "0" ITTL Load 0 to +70°C Standard -55°C to +105°C Extended -55°C to +125°C (79.4 x 66.7 x 20.4mm) NOTES ISpecifiedover the appropriate operating temperature range and for (a):1:10%signaland referenceamplitude variation (b) 10% signaland referenceharmonic diStortion (c)t'% power supply variation (d) tlO% variationin referencefrequency. .Specificationssame.. SBCDI7'2 "Specifications same u SBCD17H ",!"Specificationssame as SBCDI756 Specificationssubjectto change without notice. VOL. /I,13-42 SYNCHRO & RESOLVER CONVERTERS +15V @ SOmA .. +5V @ 50OmA ... 3.7Watts ... OBSOLETE

ApplyingtheSBCD1752/1753/1756/1757 I-- WIDTH DEPENDS ON I OPTIONISH SPECJ BUSY I I r--DI~i.tCE DEPENDS _I r--OOno VElOCITY ~ ~ t-- «IOno JL --I I- WIDTH DEPENDS ON OPTION n RECOMMENDED J LDATA TRANSFER TIME IHIOH STATE I NOT TO SCALE Data TransferDiagram The function of the INHIBIT pin isto enable the user to inh,bitthe update of the converter'soutput counter. This is achieved by taking the INHIBIT pin to a TTL Logic zero.If used, the INHIBIT should be applied 400ns afterthe trailing edge of the BUSY pulse.This willensure that the data on the output pins isvalid.The data should then be transferredand the INHIBIT releasedbefore the next BUSY pulse occurs. The worst case times allowable for data transferin thiscase are shown in the Specificationsunder the heading of "MAX DATA TRANSFER TIME (from 400ns After TrailingEdge of BUSY at Max Velocity)". Itshould be noted that the applica- tion of the INHlBlTwill not prevent the BUSY pulsesappear- ing on the BUSY pin, and thus ifthe INHIBIT isnot released by the time that the next BUSY pulse occurs,the BUSY pulse willstillappear, although the internalconverter loop willhave been opened. Under thiscondition,a worst case recovery time, equivalentto that of a step of 179 degrees may be encountered (seeSpec.).To avoid thisand to ensure validdata transfer,the system shown in the diagram isrecommended.

3 STATE

SuggestedExternalInterfaceCircuitry In caseswhere the converter isconnected to a data bus or used as a peripheral,the method outlined in the above diagram is recommended. The INHIBIT isnot necessary in thiscase,and the external "Enable" has control of the converter output. The AC1755 mounting card described laterin thisdata sheet contains the external components shown in the diagram. CONNECTING THE CONVERTER The power lines,which should not be reversed,should be con- nected to "+15V", "-15V" and "+5V" in the case of the SBCD1752 and SBCDI753, and to "+15V" and "+5V" in the case of the SBCDI756 and SBCDI757, with the common con- nection to "GND" in allcases. ItissuggestedthatO.lJlFand 6.8JlFcapacitorsbe placedin parallelfrom +15V to GND, from -15V to GND and from +5V to GND. The digitaloutput connections in the case of the SBCDI753 and SBCDI757 should be taken from the pins marked "0.1" through to "200"; thesevaluesbeing represented in degrees. In the case of the SBCDI752 and SBCDI756, the data should be taken from the pins marked "0.1" through to "100", these valuesalsobeing represented in degrees.In the case of these latterunitsthe "SIGN" pin willindicatethe polarityof the output, Logic "0" representingpositiveanglesand Logic "I" representingnegativeangles. In the case of a synchro, the signalsare connected to S 1,S2 and S3 according to the following convention: Synchro connection Esl - 53 = ERLO - RHI Sin wt Sin 8 Es3 - 52 = ERLO - RHI Sin wt Sin (8 + 1200) Es2 - 51 = ERLO - RHI Sin wt Sin (8 + 2400) For a resolver,the signalsareconnected to "S I", "S2", "S3" and "S4" according to the following convention: Resolver Connection Esl -53 = ERLO - RHI Sinwt Sin8 Es2 - 54 = ERHI - RLO Sin wt Cos 8 The BUSY and INHIBIT pin (ifused),should be connected as describedunder the heading "DATA TRANSFER". The referenceconnections are made to pins RHI and RLO' PIN CONNECTION DIAGRAM Dimensionsshown ininchesand (mm). r 1 141 2.625 166,11 PINS 0.040 '0.001 110.16 '0.031 DIA BRASS HARD GeLD PLATED 02115.31 ---.,- IISEE NOTE +-ICI 11'+54 0,1 0.2 0.< 0.8 SI +--+-+ BUSY 3.125 179.<1 INHIBIT +15V 10 SEE - aNY NOTE ~-;- IAI

40 NOTES

SBCD115] IBI ON SBCD1152 AND SBCD1156MARKED AS SIGN ICI PRESENT ON RE, SOLVER TO 0101. TAL CONVERTER IRBCDI ONL y, BO SEE NOTE~: '001 IBI "t ~L RLo RHo 0,2616.61 t TOPVIEW --11--0RIDOI12.51 MATING SOCKET: CAMBION 450-3388-01-03 RESISTIVE SCALING OF INPUTS A unique featureof the SBCD17521175 3/1756/1757 con- vertersistha'tthe inputscan be resistivelyscaledto accommo- date any value of input signaland referencevoltage. In order to calculatethe valuesof the externalscalingresistors necessary,add 1.11kS1 inserieswith the input per extra volt in the case of the signal,and 2.2kS1 per extravolt in the case of the reference. For example, assume that itisrequired to use a standard 11.8V lineto linesignal,26V referenceconverter with 60V lineto linesignaland a 115V reference.The resistorsshould be ar- ranged as in the diagram. SYNCHRO & RESOL VER CONVERTERS VOL. /I,13-43~.- --- ~ OBSOLETE

INPU' n, S, R, .R,. R,. "510" R,.,"'..."A, S, STANDARD

11 SV SIGNAL

'"VA" SBCD SERIES CONVERTER R, 5, "'V." { R,o R, R., Note: In the case of R J,R2' and R3, the ratioerrorbetween the resistancesismore criticalthan the absolutevalue. In general a 1% ratioerrorwillgive riseto an extra inaccuracy of 0.28 Degrees, while a ratioaccuracy of 0.1% willgive riseto an extra inaccuracy of 0.028 Degrees. The absolutevalue of RF isnot critical. CARD MOUNTING All the converterscan be mounted on an AC1755 mounting card.This card contains the latchesand monostable, described under the "DATA TRANSfER" heading,which are necessary to transferthe data on to a computer bus system, as well as sockets for the converter.The latcheshave a tri-stateoutput to facilitateease of use.The AC1755 alsocontains facilities for the inclusionof input signalscalingand referenceresistors as described under the heading "RESISTIVE SCALING OF INPUTS". The card uses a 22/22 0.156" pitch edge connector. The pin-out isshown below. Ifitisnot requiredto use the externallatches,they can be jumpered on the board. r4.. 11T4.JI--j BOTTOM ,---, TI I 60 L___; U "si'4' 0.36 19.251 t1--J.57 190 1 1---O.S I 120.J) A 0.15 tJ.B" AC1755 Mounting Card (FirstAngle Projection). DimensionsShown inInchesand (mm). NOTES (1) SBCD1753 and SBCDl757 only (2) SBCD1752 and SBCD1756 only (3) SBCD1752 and SBCD1753 only AC1755 Mounting Card Edge Connections VOL. /I,13-44 SYNCHRO & RESOL VER CONVERTERS '-',"',""",,'VnlnnlIVI'I Converters should be ordered by the appropriatepart number (i.e.,SBCDI752, SBCDI75 3,SBCD1756 or SBCDI757) fol- lowed by the appropriateoption code. Ifthe unit isto be a Resolver-to-Digitalconverter,the SBCD should be replacedby RBCD inthe part number. The XYZ options are asfollows: X signifiesthe operating temperature range thus; X = 5 0 to +70°C (Commercial Temp.) X = 6 -55°C to +105°C (Extended Temp.) Y signifiesthe referencefrequency thus; Y = 1 signifies400Hz Y = 2 signifies60Hz* Y = 4 signifies2.6kHz Z signifiesthe input signaland referencevoltagesand whether the converterisa Synchro-to-Digitalor a Resolver-to-Digital converter.The options for Z are: Z = 1 signifiesSynchro, signal11.8 Volts . reference26 Volts Z = 2 signifiesSynchro, signal90 Volts reference 115 Volts Z = 8 signifiesResolver, signal11.8 Volts reference26 Volts Thus an SBCD1753 with a commercial (0 to +70°C) operating range,using a 400Hz, 26 volt referencewith an 11.8 volt signalwould be ordered as an SBCD17535f1. *For 50Hz operation,a 60Hz convenercanbe usedwithno reduction inaccuracy. Inadditiona 400Hz unitwillwork witha 2.6kHz referenceand a 60Hz unitwillwork witha 400Hz reference;however theywillhave the velocityand accelerationcharacteristicsofthelowerfrequencyrated unit. OTHER PRODUCTS The SBCD seriesof Synchro-to-Digitalconvertersarejusta few of the modules and instruments concerned with Synchro con- versionmanufactured by us. Some of our other products are listedbelow and technicaldata isavailable.Ifyou have any questions about our products or requireadvice about the use of them for a particularapplication,pleasecontact our Applications Engineering Department. SYNCHRO-TO-DIGIT AL CONVERTERS The SDC1700 isa low profile(0.4")converter with a 12-bit naturalbinary output. Itsoverallaccuracy is:t8.5arc-minutes, and the module containsinternaltransformersfor allreference frequency options including60Hz. The SDCI702 issimilarto the SDC1700 but has a to-bitnaturalbinary output and an overallaccuracy of :t22arc-minutes. The SDC1704 issimilarto the above two converters,but has a 14-bitnaturalbinary output and an overallaccuracy of :t2.0 arc-minutes:tILSB. TWO SPEED PROCESSORS The TSL1612 and the TSL1729 both produce one digitalout- put word up to 20 ~itsinlengthfrom theoutputs of 2 Synchro- to-Digitalconvertersin a coarse/finesystem. The TSL1612 is used for ratiosof 9:1, 18:1 and 36: I,while the TSLI729 is programmable for allratiosfrom 1:1 to 63: 1. Edge Pin Funcrion Edge-Pin FunctionNumber Letter

1 R (Lo) A Tri-StateEnable

2 R (Hi) F +15 Volts

3 S3 H +15 Volts

4 S2 J -15 Volts (3)

5 SI K -15 Volts (3)

6 S4 L GND

13 BUSY N +5 Volts

15 INHIBIT P +5 Volts

16 0.1 T 8 17 0.2 U 10 18 0.4 V 20 19 0.8 W 40 20 1 X 80 21 2 Y 100 22 4 Z 200 (1) SIGN (2) OBSOLETE