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DSC1705 Dataheets PDF



Part Number DSC1705
Manufacturers Analog Devices
Logo Analog Devices
Description DIGITAL TO SYNCHRO CONVERTERS
Datasheet DSC1705 DatasheetDSC1705 Datasheet (PDF)

-. ANALOG W DEVICES Digital- to-Synchro Converters I DSC1705/1706 I FEATURES Very Low Radius Vector Variation (Transformation Ratio) (:to.1%) High Accuracy (:t2 arc-mins at +25°C) 12- or 14.Bit Resolution No 5 Volt Power Supply Required MIL Spec/Hi Rei Versions Available Internal 1.3VA Amplifiers Internal Transformers (40PHz Option) No Trims or Adjustments Necessary APPLICATIONS Driving Control Transformers Driving Torque Receivers (with External Amplifiers) OServo Mechanisms Retransmis.

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-. ANALOG W DEVICES Digital- to-Synchro Converters I DSC1705/1706 I FEATURES Very Low Radius Vector Variation (Transformation Ratio) (:to.1%) High Accuracy (:t2 arc-mins at +25°C) 12- or 14.Bit Resolution No 5 Volt Power Supply Required MIL Spec/Hi Rei Versions Available Internal 1.3VA Amplifiers Internal Transformers (40PHz Option) No Trims or Adjustments Necessary APPLICATIONS Driving Control Transformers Driving Torque Receivers (with External Amplifiers) OServo Mechanisms Retransmission Systems BPositional Control SGENERAL DESCRIPTION OThe DSC1705 and DSC1706 are Digital-to-Synchro and Digital- to-Resolver converters capable of driving electromechanical Lloads of up to 1.3VA. EThey accept a 14- or 12-bit digital input representing angle Tand a reference voltage of either 60Hz or 400Hz, and produce Ea 3 wire or 4 wire output suitable for driving Synchros or MODELS AVAILABLE The two Digital to Synchro/Resolver converters described in this data sheet differ primarily in the areas of resolution and accuracy as follows: Model DSC1705XYZ is a 14-bit converter with an overall accuracy of :t4 arc-minutes. Model DSC 1706XYZ is a 12-bit converter with an overall Resolvers. accuracy of 18 arc-minutes. The 400Hz converters contain internal1.3V A amplifiers as well as output and reference transformers. The 60Hz versions contain internal 1.3VA amplifiers but require external output and reference transformers. If it is necessary to drive a load requiring more than 1.3VA, options for both the 400Hz and 60Hz converters are available allowing the use of external amplifiers and transformers. The XYZ option code defines the option thus: (X) signifies the operating temperature range, (Y) signifies the reference frequency, (Z) signifies the output and the reference voltages, whether the output is in ~ynchro or Resolver format and whether external transformers are required. II RHi RADIUS VECTOR One of the outstanding features of these converters is the almost negligible Radius Vector variation (Transformation Ratio). REFERENCE TRANS. FORMERS SCOTT TEE TRANSFORMERS 53 On many Digital-to-Synchro converters presently available, the individual sine and cosine outputs produced do not follow the exact sine and cosine laws, and depending upon angle can vary up to :t7%. This is not always important as the ratio of the sine to the cosine, i.e., the tangent, is always correct to the specified accuracy of the converter. There are cases however, when driving torque receivers and certain servo control loops when this variation is unacceptable. "MSB OIGiTAL INPUT WI / Principle of Operation FUNCTIONAL DIAGRAM, DSC170S and DSC1706 The principle of operation of the converters described in this data sheet is shown in the diagram above. The design of the DSC1705 and DSC1706 has reduced this variationto lessthan to.l%. This meansthat when the convertersare usedin closedloop servosystems,the gain of the closed loop is independent of the digital input angle, thus making reference correction unnecessary. Model DSC170S DSC1706 ACCURACY. :1:4arc-minutes :t8 arc-minutes RESOLUTION INPUT CODE 14 Bits (lLSB =1.3 arc-minutes) M14S-BB=its1N80a°tural ParallelBinarywith 12 Bits (lLSB = 5.3 arc-minutes) M12S-BBi=ts Natural 180° Parallel Binary with REFERENCE VOLTAGE INPUT With Internal Transformers . Low Level High Level External Transformer Options2 REFERENCE FREQUENCY 26V rms 115V rms 4V rms 60Hz or 400Hz .. . . REFERENCE INPUT IMPEDANCE With Internal Transformers Low Level . High Level External Transformer Options2 DIGITAL IN,PUT(TTL COMPATIBLE) OUTPUT VOLTAGE AND FORMAT With Internal1ransformers Low Level OHigh Level BExternal :Transformer Options3 SLOAD CAPABILITY OSHORT CIRCUIT PROTECTION LOUTPUT SETTLING TlME4 ERADIUS VECTOR VARIATION (Transformation Ratio) TEINTERNAL TRANSFORMER ISOLATION 20kQ 200kQ lOkQ lTTL Load 11.8V rms Line-to-Line Synchro or Resolver 90V rms Line-o-Line Synehro or Resolver 7V rms Sineand Cosine 1.3VA ContlDuousfor 5 minutes ° 50/Js for 180 Step to.1% max Sineand Cosine 500V de . . . . . . . . . . . . POWER SUPPLIES Voltage Current. (a) No Load (b) Full Load Mean WARM-UP TIME OPERATING TEMPERATURE RANGE STORAGE TEMPERATURE RANGE SIZE t15V de :1:5% 95mA per Line 225mAper Line lsee to Full Accuracy 0 to +700C Standard -55°C to +105°CExtended -55°C to +125°C 3.125" x 2.625" x 0.8" (79.4mm x 66.7mm x 20.3mm) . . . . . . . . . WEIGHT MEAN TIME BETWEEN FAILURES (MTBF) CALCULATED 8 ounces(224 grams)max 150,000 Hours . . NOTES .Specifications same as DSC1705. I Accuracy applies over the full operating temperature range of the option and for: (a) :1:10%reference frequency and amplitude variation. (b) 10% harmonic distortion on the reference. (c) :t5% power supply variation. (d) Any balanced load from no load to full load. 2 Refers to input to converter and not to external transformers. 3 Refers to output from internal converter amplifiers and not from external transformers. .


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