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Número de pieza SD-146220x-xx
Descripción 2-Channel Synchro / Resolver to Digital Converter
Fabricantes DDC 
Logotipo DDC Logotipo



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SD-14620 SERIES
TWO-CHANNEL SYNCHRO/RESOLVER-
TO-DIGITAL (S/R-D) CONVERTERS
DESCRIPTION
The SD-14620 Series converters are small, low-cost, two-channel
hybrid Synchro- or Resolver-to-Digital converters based on a single-
chip monolithic. The SD-14620X“S” option offers synthesized refer-
ence circuitry to correct for phase shifts between the reference and
signal inputs. The two channels are independent but share the digital
output and +5 VDC power pins. The package is 54-pin ceramic, yet is
the size of a 28-pin DDIP.
Resolution programming allows selection of 10-, 12-, 14- or 16-bit
modes. This feature allows selection of either low-resolution for fast
tracking or higher resolution for higher accuracy.
The velocity outputs (VEL A, VEL B) of the SD-14620 Series, which can
be used to replace a tachometer, are ±4 V signals referenced to analog
ground.The SD-14620 Series also offers Built-In-Test outputs for each
channel (BIT-A, BIT-B). The converters are available with operating
temperature ranges of 0°C to +70°C, -40°C to +85°C and -55°C to
+125°C. MIL-PRF-38534 processing is available.
Make sure the next
Card you purchase
has...
®
FEATURES
Synthesized Reference Option
1 Minute Accuracy Available
(“S” Option only)
Single +5 V Power Supply
10-, 12-, 14- or 16-Bit Programmable
Resolution
Small 54-Pin Ceramic Package
BIT Output
Velocity Output Replaces
Tachometer
High Reliability Single Chip
Monolithic
-55°C to +125°C Operating
Temperature Range
MIL-PRF-38534 Processing Available
APPLICATIONS
With its low-cost, small size, high accuracy and versatile performance,
the SD-14620 Series converters are ideal for use in modern high-per-
formance military, commercial and position control systems. Typical
applications include radar antenna positioning, motor control, robotics,
navigation and fire control systems.
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
FOR MORE INFORMATION CONTACT:
Technical Support:
1-800-DDC-5757 ext. 7771
All trademarks are the property of their respective owners.
© 1991, 1999 Data Device Corporation

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THEORY OF OPERATION
GENERAL SET-UP CONSIDERATIONS
The SD-14620 Series of converters are based upon a single
chip CMOS custom monolithic. Using the latest technology, pre-
cision analog circuitry is merged with digital logic to form a com-
plete, high-performance tracking Synchro/Resolver-to-Digital
(S/D, R/D) converter.
CONVERTER OPERATION
FIGURE 1 is the Functional Block Diagram of the SD-14620
Series. The converter operates with a single +5 VDC power sup-
ply and each channel internally generates a negative voltage of
approximately 5 volts. These negative voltages are connected to
pin 52 (channel “A” filter point) and pin 24 (channel “B” filter
point) — see GENERAL SETUP CONSIDERATIONS.
The following recommendations should be considered when
connecting the SD-14620 Series converters:
1) The +5 VDC power supply input is on pin 18. For performance
with the lowest amount of noise it is recommended that a
10 µF/10 VDC (or larger) tantalum filter capacitor be connect-
ed to ground (pin 19) near the converter package.
2) Direct inputs are referenced to Analog Ground (A GND).
Connections should be made as close to the converter pack-
age as possible to minimize noise. Channel A should be ref-
erenced to A GND-A (pin 5) and Channel B should be refer-
enced to A GND-B (pin 32).
The converter is made up of three main sections; an input front-
end, an error processor, and a digital interface. The converter
front-end differs for synchro, resolver and direct inputs. An elec-
tronic Scott-T is used for synchro inputs, a resolver conditioner
for resolver inputs, and a sine and cosine voltage follower for
direct inputs. These amplifiers feed the high accuracy Control
Transformer (CT). Its other input is the 16-bit digital angle φ. Its
output is an analog error angle, or difference angle, between the
two inputs. The CT performs the ratiometric trigonometric com-
putation of SINθCOSφ - COSθSINφ = SIN(θ - φ) using amplifiers,
switches, logic, and capacitors in precision ratios. The converter
accuracy is limited by the precision of the computing elements in
the CT. For enhanced accuracy, the CT in these converters use
capacitors in precision ratios, instead of the more conventional
precision resistor ratios. Capacitors that are used as computing
elements with op-amps are sampled at a high rate to eliminate
drift and the op-amp offsets.
3) A 47 µF/10 V tantalum filter capacitor must be added exter-
nally from pin 52 (channel “A” filter point) to pin 19 (ground). In
addition, a 47 µF/10 Vdc tantalum filter capacitor must be
added externally from pin 24 (channel “B” filter point) to pin 19
(ground).
SPECIAL FUNCTIONS
PROGRAMMABLE RESOLUTION
Resolution is controlled by pins 49 and 50 for channel A; pins 21
and 22 for channel B. The resolution can be changed during con-
verter operation, so the appropriate resolution and velocity
dynamics can be changed as needed. To insure that a race con-
dition does not exist between counting and changing the resolu-
tion, the resolution control is latched internally. Refer to TABLE 2
for Channel A and B resolution control.
The error processing is performed using the industry standard
technique for type II tracking R/D converters. The DC error is
integrated yielding a velocity voltage which in turn drives a volt-
age-controlled oscillator (VCO). This VCO is an incremental inte-
grator (constant-voltage input to position-rate output) that,
together with the velocity integrator, forms a type II servo feed-
back loop. A lead in the frequency response is introduced to sta-
bilize the loop and a lag at a higher frequency is introduced to
reduce the gain and ripple at the carrier frequency and above.
TABLE 2. RESOLUTION CONTROL (A AND B)
RESOLUTION
10 bit
12 bit
14 bit
16 bit
B
0
0
1
1
A
0
1
0
1
TABLE 3. DIGITAL ANGLE OUTPUTS
BIT
1 (MSB ALL MODES)
2
3
4
5
6
7
8
9
10 (LSB 10-BIT MODE)
11
12 (LSB 12-BIT MODE)
13
14 (LSB 14-BIT MODE)
15
16 (LSB 16-BIT MODE)
DEG/BIT
180
90
45
22.5
11.25
5.625
2.813
1.406
0.7031
0.3516
0.1758
0.0879
0.0439
0.0220
0.0110
0.0055
MIN/BIT
10800
5400
2700
1350
675
337.5
168.75
84.38
42.19
21.09
10.55
5.27
2.64
1.32
0.66
0.33
Note: EM enables the MSB byte and EL enables the LSB byte.
Data Device Corporation
www.ddc-web.com
5
SD-14620
M-03/06-0

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STANDARD DDC PROCESSING
FOR HYBRID AND MONOLITHIC HERMETIC PRODUCTS
TEST
INSPECTION
SEAL
TEMPERATURE CYCLE
CONSTANT ACCELERATION
BURN-IN
MIL-STD-883
METHOD(S)
CONDITION(S)
2009, 2010, 2017, and 2032
1014
A and C
1010
C
2001
3000g
1015 (note 1), 1030 (note 2)
TABLE 1
Notes:
1. For Process Requirement "B*" (refer to ordering information), devices may be non-compliant with MIL-
STD-883, Test Method 1015, Paragraph 3.2. Contact factory for details.
2. When applicable.
The information in this data sheet is believed to be accurate; however, no responsibility is
assumed by Data Device Corporation for its use, and no license or rights are
granted by implication or otherwise in connection therewith.
Specifications are subject to change without notice.
Please visit our web site at www.ddc-web.com for the latest information.
M-03/06-0
105 Wilbur Place, Bohemia, New York, U.S.A. 11716-2482
For Technical Support - 1-800-DDC-5757 ext. 7771
Headquarters, N.Y., U.S.A. - Tel: (631) 567-5600, Fax: (631) 567-7358
Southeast, U.S.A. - Tel: (703) 450-7900, Fax: (703) 450-6610
West Coast, U.S.A. - Tel: (714) 895-9777, Fax: (714) 895-4988
United Kingdom - Tel: +44-(0)1635-811140, Fax: +44-(0)1635-32264
Ireland - Tel: +353-21-341065, Fax: +353-21-341568
France - Tel: +33-(0)1-41-16-3424, Fax: +33-(0)1-41-16-3425
Germany - Tel: +49-(0) 89-150012-11, Fax: +49-(0) 89-150012-22
Japan - Tel: +81-(0)3-3814-7688, Fax: +81-(0)3-3814-7689
World Wide Web - http://www.ddc-web.com
U
®
STERED
DATA DEVICE CORPORATION
REGISTERED TO ISO 9001:2000
FILE NO. A5976
11 PRINTED IN THE U.S.A.

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