SBCD1756_15 Datasheet, PDF (1/4 Pages) Analog Devices – BCD OUTPUT SYNCHRO TO DIGITAL CONVERTERS

~ ANALOG
W DEVICES
BCDOutput
Synchro-to- 0igital Converters
I
SBCD1752/1753/1756/17I57
FEATURES
BCD (Binary Coded Decimal) Output Representing 0 to 359.9°
or 0 to t179.9°
-15V Power Supply Requirement Optional
High Tracking Rate (75 revs/sect
Internal Microtransformers for 60Hz, 400Hz and 2.6kHz
Options
Voltage Scaling with External Resistors (Unique Feature)
Transformer Isolated Outputs
Low Cost
OBSOLETE ^{MILSpec/Hi ReiOptions Available}
APPLICATIONS
Visual Display of Angular Information
Valve Position Indication
Antenoa Monitoring
Industrial Controls
GENERAL DESCRIPTION
The SBCDI752, SBCDI753, SBCD1756 and the S~CD1757
are modular, continuous tracking Synchro/Resolver-to-Digital
converters which employ a type 2 servo loop.
They are intended for use in both Industrial and Military
applications either for displaying angular data directly, or for
inputting BCD information directly into a data processing
system.
Model SBCD1753XYZ is a 14-bit, BCD output converter,
giving 0 to 359.9°, requiring t15V and +5V power supplies,
and having an overall accuracy of to.2 Degrees.
Model SBCD1756XYZ is a 13-bit plus' 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 overall accuracy
of to.2 Degrees.
Model SBCD1757XYZ is a 14-bit. BCD output converter,
giving 0 to 359.9°, requiring +15V and +5V power supplies,
The input signals can be either 3 wire synchro plus reference
and having an overall accuracy of :to.2 Degrees.
or 4 wire resolver plus reference, depending on the option.
The ou tpu ts will be presented in parallel Binary Coded
Decimal (BCD).
The XYZ code defines the option thus:
X signifies the operating temperature range.
Y signifies the reference frequency.
Particular attention has been paid in the design, to achieving
Z signifies the input voltage and range and whether it will
II
the highest tracking rates and accelerations possible, com-
patible with the resolution and carrier frequency used, while
at the same time obtaining a high overall accuracy.
One of the outstanding featUres of these converters is the use
made of precision Scott T and reference microtransformers.
This has made it possible to include the transformers within
the module, even for the 60Hz version as well as providing
facilities for external voltage scaling.
MODELS AVAILABLE
accept Synchro or Resolver information.
More information about the option code is given under the
heading "Ordering Information".
DATA TRANSFER (ALL MODELS)
The readiness of the converters for data transfer is indicated
by the state of the BUSY pin. The voltage appearing on the
BUSY pin consists of a train of pulses, at TTL levels, of length
according to the option (see Specifications table). The con-
verter is busy when the BUSY pin is at TTL "High" level. The
The four Synchro-to-Digital converters described in this data
pulses occur for increasing and decreasing counts.
sheet, differ primarily in the areas of output format and power
supply requirements.
Model SBCD1752XYZ is a 13-bit plus 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 overall accuracy
of :to.2 Degrees.
The most suitable time for transferring data is 400ns after the
tra:ling edge of the BUSY pulse, and the times allowable for
data transfer are shown in the specification. Even at the maxi-
mum speed of the option, these times will be sufficient to
transfer data before the next BUSY pulse occurs.
- - SYNCHRO & RE~OLYER CONVERTERS VOL. II. 13-41