~
ANALOG
W DEVICES
I
BCDOutput
Synchro-o- 0igital Converters
t
SBCD1752/1753/1756/1757
I
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.
OBS
APPLICATIONS
Visual Display of Angular Information
Valve Position Indication
Antenoa Monitoring
Industrial Controls
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
MIL Spec/Hi Rei Options Available
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.
The input signals can be either 3 wire synchro plus reference
or 4 wire resolver plus reference, depending on the option.
The ou tpu ts will be presented in parallel Binary Coded
Decimal (BCD).
OLE
TE
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,
and having an overall accuracy of :to.2 Degrees.
The XYZ code defines the option thus:
X signifies the operating temperature range.
Y signifies the reference frequency.
Z signifies the input voltage and range and whether it will
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
pulses occur for increasing and decreasing counts.
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.
II
Particular attention has been paid in the design, to achieving
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
The four Synchro-to-Digital converters described in this data
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.
-
-
SYNCHRO
&
RE~OLYER CONVERTERS
VOL. II.
13-41
"
LUll IU" IIUI1I"
SBCDI7S2
:to.2 Degrees
(typicalat 25uC
unless
otherwise
stated)
SBCDI753
SBCD1756
SBCD1757
MODELS
ACCURACY' (max Error)
All Frequency Options
OUTPUT
RESOLUTION
Parallel BCD, 8TTL Loads
J3-Bit + Sign Representing
-180.0° to -0.1° and
+0.0° to + 179.9°
60Hz, 400Hz and 2.6kHz
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
26HZ (Resistive)
2ookil (Resistive)
26V (11.SV Signal)
115V (90V Signal)
56kil (Resistive)
270HZ (Resistive)
OBS
500V dc
Accel. I Constant Ka
60Hz
400Hz
2.6kHz
2oo0/sec2
120.oo0/sec2
6oo,ooO/sec2
STEP RESPONSE (179° Step)
(For 0.1° Error)
60Hz
400Hz
2.6kHz'
POWER LINES
1.5sec
125ms
5Oms
+15V@25mA
-15V @ 25mA
+5V @ 50OmA
POWER DISSIPATION
3.25 Watts
60Hz
400Hz
2.6kHz
MAX DATA TRANSFER
TIME (From 400ns After
Trailing Edge of BUSY
at max Velocity)
60Hz
400Hz
2.6kHz
3.5 to
4.5/.1s
0.5 to 1.25/1s
0.5 to
1.25/.1s
4o,.ts
5.0/ls
I.S/ls
5 Revolutions Per Second
36 Revolutions Per Second
75 Revolutions Per Second
BUSY LOGIC OUTPUT, POSITIVE PULSE (1 TTL Load)
OLE
TE
+15V @ SOmA
..
+5V @ 50OmA
...
3.7Watts
...
iNillBi'f
INPUT
(To Inhibit)
Logic "0" ITTL Load
0 to +70°C Standard
-55°C to +105°C Extended
-55°C to +125°C
3.125. x 2.625" x O.S"
(79.4 x 66.7 x 20.4mm)
6.4 ozs. (1 SOgrams)
range and for
TEMPERATURE
Operating
Storage
DIMENSIONS
WEIGHT
RANGE
6.5ozs. (1S5 grams)
.Specifications same.. SBCDI7'2
"Specifications
same u SBCD17H
",!"Specifications same as SBCDI756
Specifications
subject to change without notice.
...
NOTES
I Specified over the appropriate operating temperature
(a) :1:10%signal and reference amplitude variation
(b) 10% signal and reference harmonic diStortion
(c)
t'%
power supply variation
(d) tlO% variation in reference frequency.
VOL. /I,
13-42
SYNCHRO
&
RESOLVER
CONVERTERS
Applying
theSBCD1752/1753/1756/1757
-1
I--
WIDTH DEPENDS
ON
I
I
OPTION SPECJ
ISH
BUSY
I
r--DI~i.tCE
DEPENDS
r--OOno
VElOCITY ~
_I
The digital output connections in the case of the SBCDI753
and SBCDI757 should be taken from the pins marked "0.1"
through to "200"; these values being 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
values also being represented in degrees. In the case of these
latter units the "SIGN" pin will indicate the polarity of the
output, Logic "0" representing positive angles and Logic "I"
representing negative angles.
In the case of a synchro, the signals are connected
and S3 according to the following convention:
Synchro connection
Esl - 53
Es3
-
52
Es2
-
51
~
,
I
t-- «IOno
JL
--I
I-
NOT TO SCALE
J
WIDTH DEPENDS
ON OPTION
n
RECOMMENDED
LDATA
TRANSFER
TIME IHIOH STATE I
Data Transfer Diagram
The function of the INHIBIT pin is to enable the user to
inh,bit the update of the converter's output counter. This is
achieved by taking the INHIBIT pin to a TTL Logic zero. If
used, the INHIBIT should be applied 400ns after the trailing
edge of the BUSY pulse. This will ensure that the data on the
output pins is valid. The data should then be transferred and
the INHIBIT released before the next BUSY pulse occurs.
The worst case times allowable for data transfer in this case
are shown in the Specifications under the heading of "MAX
DATA TRANSFER TIME (from 400ns After Trailing Edge of
BUSY at Max Velocity)". It should be noted that the applica-
tion of the INHlBlTwill not prevent the BUSY pulses appear-
ing on the BUSY pin, and thus if the INHIBIT is not released
by the time that the next BUSY pulse occurs, the BUSY pulse
will still appear, although the internal converter loop will have
been opened. Under this condition, a worst case recovery time,
equivalent to that of a step of 179 degrees may be encountered
(see Spec.). To avoid this and to ensure valid data transfer, the
system shown in the diagram is recommended.
to S 1, S2
=
ERLO
-
OBS
3 STATE
ENABLE
TO COMPUTER
INPUT PORT
RHI Sin wt Sin 8
=
ERLO - RHI Sin wt Sin (8 + 1200)
=
ERLO
-
RHI Sin wt Sin (8 + 2400)
For a resolver, the signals are connected to "S I", "S2", "S3"
and "S4" according to the following convention:
Resolver Connection
OLE
TE
Es2 - 54
Esl
-
53
=
ERLO-
=
ERHI -
RHI Sin wt Sin 8
RLO Sin wt Cos 8
The BUSY and INHIBIT pin (if used), should be connected
as described under the heading "DATA TRANSFER".
PIN CONNECTION DIAGRAM
Dimensions shown in inches and (mm).
2.625
166,11
The reference connections
are made to pins RHI and RLO'
r
1
f.
PINS 0.040 '0.001 110.16 '0.031
BRASS HARD GeLD PLATED
DIA
141
02115.31
---.
,-
+-
<
74113
TRI STATE
LATCHES
SEE
NOTE
ICI
11'+
54
......
53
S2
SI
+--+-+
BUSY
0,1
0.2
.....
0.<
0.8
II
3.125
179.<1
INHIBIT
+15V
aNY
~-;-
SEE -
NOTE
IAI
SEE
NOTE~:
IBI "t
Suggested External Interface Circuitry
In cases where the converter is connected
to a data bus or used
as a peripheral, the method outlined in the above diagram is
recommended. The INHIBIT is not necessary in this case, and
the external "Enable" has control of the converter output.
The AC1755 mounting card described later in this data 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 all cases.
10
20
40
BO
NOTES
IAI NOT PRESENT ON
SBCD1156 AND
SBCD115]
IBI ON SBCD1152 AND
SBCD1156MARKED
AS SIGN
ICI PRESENT ON RE,
SOLVER TO
0101.
TAL CONVERTER
IRBCDI ONL y,
~
L
0,2616.61
RLo
RHo
'001
.
~
t
TOPVIEW
--11--0RIDOI12.51
MATING SOCKET: CAMBION 450-3388-01-03
RESISTIVE SCALING OF INPUTS
A unique feature of the SBCD17521175 3/1756/1757 con-
verters is tha't the inputs can be resistively scaled to accommo-
date any value of input signal and reference voltage.
In order to calculate the values of the external scaling resistors
necessary, add 1.11 kS1 in series with the inpu t per extra volt
in the case of the signal, and 2.2kS1 per extra volt in the case
of the reference.
For example, assume that it is required to use a standard 11.8V
line to line signal, 26V reference converter with 60V line to
line signal and a 115V reference. The resistors should be ar-
ranged as in the diagram.
SYNCHRO
&
RESOL VER CONVERTERS
~.-
VOL. /I,
13-43
---
~
It is suggested that
O.lJlF
and
6.8JlF
capacitors be placed in
parallel from +15V to GND, from -15V to GND and from
+5V to GND.
n,
6OV II
INPU'
S,
R, . R,. R,. "510"
STANDARD
11 SV SIGNAL
'"VA"
SBCD SERIES
CONVERTER
'-' ,"'
,"" ",,'VnlnnlIVI'I
A, S,
R,. ,"'..."
{
"'V." {
R,
5,
R,o
Converters should be ordered by the appropriate part number
(i.e., SBCDI752, SBCDI75 3, SBCD1756 or SBCDI757) fol-
lowed by the appropriate option code.
If the unit is to be a Resolver-to-Digital converter, the SBCD
should be replaced by RBCD in the part number.
The XYZ options are as follows:
X signifies the operating temperature
X
R, R.,
OBS
r4..
11T4.JI--j
Note: In the case of R J , R2' and R3, the ratio error between
the resistances is more critical than the absolute value. In
general a 1% ratio error will give rise to an extra inaccuracy of
0.28 Degrees, while a ratio accuracy of 0.1 % will give rise to
an extra inaccuracy of 0.028 Degrees. The absolute value of
RF is not critical.
CARD MOUNTING
All the converters can be mounted on an AC1755 mounting
card. This card contains the latches and monostable, described
under the "DATA TRANSfER" heading, which are necessary
to transfer the data on to a computer bus system, as well as
sockets for the converter. The latches have a tri-state output
to facilitate ease of use. The AC1755 also contains facilities
for the inclusion of input signal scaling and reference resistors
as described under the heading "RESISTIVE SCALING OF
INPUTS". The card uses a 22/22 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.
range thus;
Temp.)
=
5
0 to +70°C (Commercial
X
=
6
-55°C to +105°C (Extended Temp.)
Y signifies the reference frequency thus;
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 a Synchro-to-Digital or a Resolver-to-Digital
converter. The options for Z are:
signal 11.8 Volts
Z
=
1 signifies Synchro,
.
reference 26 Volts
Z
=
2 signifies Synchro,
signal 90 Volts
reference 115 Volts
Z
=
8 signifies Resolver,
signal 11.8 Volts
reference 26 Volts
Thus an SBCD1753 with a commercial (0 to +70°C) operating
range, using a 400Hz, 26 volt reference with an 11.8 volt
signal would be ordered as an SBCD17535f1.
*For 50Hz operation, a 60Hz convener can be used with no reduction
inaccuracy.
In addition a 400Hz unit will work with a 2.6kHz reference and a 60Hz
unit will work with a 400Hz reference; however they will have the
velocity and acceleration characteristics of the lower frequency rated
unit.
BOTTOM
,---,
I
0.36
19.251
I
T
60
1
A
1---
I
"si'4'
L___;
L
c:~ C1 =.1 c:::::
U
t1--J.57
190
1
AC1755 Mounting Card (First Angle Projection).
Dimensions Shown in Inches and (mm).
Edge Pin
Number
1
2
3
4
5
6
13
15
16
17
18
19
20
21
22
Edge-Pin
Letter
A
F
H
OLE
TE
O.S
120.J)
0.15
tJ.B"
Funcrion
R (Lo)
R (Hi)
S3
S2
SI
S4
BUSY
INHIBIT
0.1
0.2
0.4
0.8
1
2
4
Function
Tri-State Enable
+15 Volts
+15 Volts
-15 Volts (3)
-15 Volts (3)
GND
GND
+5 Volts
+5 Volts
8
10
20
40
80
100
200 (1) SIGN (2)
OTHER PRODUCTS
The SBCD series of Synchro-to-Digital converters are just a few
of the modules and instruments concerned with Synchro con-
version manufactured by us. Some of our other products are
listed below and technical data is available. If you have any
questions about our products or require advice about the use
of them for a particular application, please contact our
Applications Engineering Department.
SYNCHRO-TO-DIGIT AL CONVERTERS
The SDC1700 is a low profile (0.4") converter with a 12-bit
natural binary output. Its overall accuracy is :t8.5 arc-minutes,
and the module contains internal transformers for all reference
frequency options including 60Hz. The SDCI702 is similar to
the SDC1700 but has a to-bit natural binary output and an
overall accuracy of :t22 arc-minutes.
The SDC1704 is similar to the above two converters, but has a
14-bit natural binary output and an overall accuracy of :t2.0
arc-minutes :tILSB.
TWO SPEED PROCESSORS
The TSL1612 and the TSL1729 both produce one digital out-
put word up to 20 ~its in length from the outputs of 2 Synchro-
to-Digital converters in a coarse/fine system. The TSL1612 is
used for ratios of 9: 1, 18: 1 and 36: I, while the TSLI729 is
programmable for all ratios from 1: 1 to 63: 1.
J
K
L
M
N
P
T
U
V
W
X
Y
Z
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
-
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