DSC-644 [ETC]
Resolver and Synchro Conversion Modules|LOW PROFILE. 1.5 VA ; 解析器和同步转换模块|低调。 1.5 VA\n
| 型号： | DSC-644 |
| 厂家： | 
ETC |
| 描述： | Resolver and Synchro Conversion Modules|LOW PROFILE. 1.5 VA
|
| 文件： | 总8页 (文件大小：207K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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DSC-644
14-BIT D/S AND D/R CONVERTER
LOW-PROFILE INDUSTRY STANDARD
FEATURES
• 1.5 VA Drive Capability
• Protected Output:
- Rugged Current-Limited Output
- Short-Circuit Protection
- Overvoltage Transient Protection
- Thermal Cutoff
• Metal Heatsink at Top of Case:
- Conservative Thermal Design
• Very Low Scale Factor Variation:
- 0.05% Typical
• Output:
- Internal 400 Hz Isolation Transformer
- All Common Synchro/Resolver
Voltage Levels and Frequencies
DESCRIPTION
• Digital Input:
- CMOS and TTL Compatible
- Parallel Binary Angle Input
The DSC-644 is a low-profile Digital-to-Synchro (D/S) and Digital-to-
Resolver (D/R) converter. It is only 0.52 inches high. The DSC-644
has a standard pin configuration and has a rugged design.The power
output stage has overload and transient protection, and a thermal cut-
off to prevent overheating. The output has short-circuit protection and
an aluminum top plate to improve thermal dissipation. The DSC-644
also has a circuit design that provides a more accurate output with an
improved transient response and a negligible scale factor variation.
Reliability has also been increased.
The DSC-644 module contains an input reference isolation trans-
former. An internal output transformer is also included for all 400 Hz
versions. The 60 Hz option requires a separate output transformer.
APPLICATIONS
The DSC-644 can be used when digitized shaft angle data must be
converted to synchro or resolver form to drive control transformers,
control differential transmitters and angle indicators. Because these
converters are very rugged and meet the requirements of MIL-STD-
202E, they are suitable for the most severe industrial and military
applications, including military ground support and avionics. They are
ideal for computer-based systems where digital information is
processed, such as simulators, flight trainers, flight instrumentation,
and fire control systems.
FOR MORE INFORMATION CONTACT:
Technical Support:
1-800-DDC-5757 ext. 7382
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
All trademarks are the property of their respective owners.
©
1999 Data Device Corporation
REFERENCE
ISOLATION
TRANS-
RH
RL
REF
INPUT
DIGITAL-TO-RESOLVER
CONVERTER
FORMER
SIN
(S)
OUTPUT
POWER
AMPLIFIERS
SYNCHRO
OR
RESOLVER
OUTPUT
OUTPUT
TRANSFORMER*
(HIGH ACCURACY:
LOW SCALE FACTOR
VARIATION)
COS
(C)
BIT 1
DIGITAL
ANGLE
INPUT
* OUTPUT TRANSFORMER IS INTERNAL
FOR 400 Hz. A SEPARATE TRANSFORMER
IS NEEDED FOR 60 Hz.
BIT 14
FIGURE 1. DSC-644 BLOCK DIAGRAM
TABLE 1. DSC-644 SPECIFICATIONS (CONT.)
TABLE 1. DSC-644 SPECIFICATIONS
Applies over operating temperatures and frequency ranges, ±5% varia-
tion of power supplies, ±10% reference amplitude variation, up to 10%
reference harmonic distortion, and for any balanced load up to full load.
Applies over operating temperatures and frequency ranges, ±5% varia-
tion of power supplies, ±10% reference amplitude variation, up to 10%
reference harmonic distortion, and for any balanced load up to full load.
PARAMETER
VALUE
PARAMETER
RESOLUTION
VALUE
14 bits
TEMPERATURE RANGES
Operating (Temperature of Metal
Plate on Top of Case)
-1 Option
ACCURACY (TO FULL LOAD)
Output Accuracy
Differential Linearity
±4 minutes
±1 LSB max.
-55°C to +85°C
0°C to +70°C
-3 Option
Storage
-55°C to +125°C
DIGITAL INPUT
Logic Type
Natural binary angle.
parallel positive logic
TTL compatible
Transient protected CMOS
33 kΩ pull-up to +5V
PHYSICAL CHARACTERISTICS
Converter Module (encapsulated)
Size
3.125 x 2.625 x 0.52 inch
(7.94 x 6.67 x 1.32 cm)
5.1 oz max
Weight
(145 g)
Loading
0.13 Std TTL loads
60Hz Transformer Module
(encapsulated)
Size
REFERENCE INPUT
(TRANSFORMER-ISOLATED)
Units with 90 Vrms L-L Output 115 Vrms
Units with 11.8 Vrms L-L Output 26 Vrms
REFERENCE
VOLTAGE LEVEL*
MAX REF.
CURRENT
0.6 mA
2.25 x 2.25 x 0.81 inch
(5.7 x 5.7 x 2.1 cm)
10.5 oz max
0.6 mA
Weight
* +20% absolute max.
to avoid damage.
(298 g)
ANALOG OUTPUT
(TRANSFORMER-ISOLATED)
Drive Capability (L-L Balanced*)
Synchro Output
90 Vrms L-L, 360-440 Hz
(Option H)
90 Vrms L-L, 57-440 Hz
(Option 6)
11.8 Vrms L-L, 360-440 Hz
(Option L)
4 kΩ min
4 kΩ min
70 Ω min
Resolver Output
11.8 Vrms L-L, 360-440 Hz
(Option L)
TABLE 2. BIT WEIGHT TABLE
BIT
DEG/BIT
MIN/BIT
10,800
5,400
2,700
1,350
675
93 Ω min
1 MSB
180
90
Output Scale Factor
Absolute (All Causes)
±2% max simultaneous amplitude
variation on all output lines, including
variation with digital angle. Output
amplitude tracks reference input
amplitude.
2
3
45
4
22.5
5
11.25
5.625
2.813
1.406
0.7031
0.3516
0.1758
0.0879
0.0439
0.0220
Variation with Digital Angle
Output Quadrature
±0.1% max
±0.3% max
6
337.5
168.75
84.38
42.19
21.09
10.55
5.27
7
* The output amplifiers will drive loads
with any phase angle from -90° to
+90°
8
9
10
POWER SUPPLY
Voltage
Max Voltage without Damage
Average Current
Peak Current with Normal Load 330mA max 330mA max 5mA max
Peak Current at Power Turn-on
+15V
+18V
-15V
-18V
+5V
+7V
11
12
150mA max 150mA max 5mA max
13
2.64
14 LSB
1.32
or Short Circuit
600mA max 600mA max 5mA max
Data Device Corporation
www.ddc-web.com
DSC-644
G-02/03-0
3
INTRODUCTION
7Vrms nominal ±2% resolver signal for the external transformer
when the reference input is 115Vrms.
The DSC-644 (see FIGURE 1) contains an internal digital-to-
resolver (D/R) converter which has an inherently high accuracy
and low scale factor variation. The circuit in the internal D/R con-
verter is based on an algorithm whose theoretical math error is
only ±3.5 arc-seconds (less than 5% of 1 LSB), and whose the-
oretical scale factor variation with angle is less than ±0.015%.
The output is well behaved, with negligible glitches at major tran-
sition points. The accuracy and scale factor error are now limited
by the physical components, not by the algorithm.
Minimum load impedances are listed in the Specifications Table
under Drive Capability. The DSC-644 can drive these imped-
ances under the worst case conditions stated in the table. The
minimum load impedances correspond to a 1.5VA drive capabil-
ity when the line voltages and frequencies are at their nominal
values. The metal top of the converter module should be provid-
ed with sufficient air circulation.
DDC also manufactures the DSC-544, another D/S converter
which provides 60 and 400 Hz 90V L-L synchro output. The
DSC-544 is a high efficiency, reference powered converter with
a standard 0.82 inch high profile. It does not require ±15V power
supplies. When driving the same load, the DSC-544 dissipates
half as much power as the DSC-644. At 400 Hz the DSC-544 can
drive 4.5VA compared to 1.5VA for the DSC-644. Both units can
drive 1.5VA at 60 Hz, but the DSC-544 does not require an exter-
nal transformer at this frequency.
The digital inputs are transient protected CMOS switches with 33
kΩ pull up resistors to the +5V supply, and can be driven by all
standard TTL gates. If the TTL gates drive other loads as well,
the circuit must allow the 33 kΩ resistors to pull up the logic level
to within 1.0V of the +5V supply. Bit weights for the 14 binary
inputs are given in the bit weight table. The angle is determined
by adding bits in the logic 1 state.
The internal reference input transformer provides isolation at
both 60 Hz and 400 Hz, so a change of frequency will not cause
damage. The input is specified for operation at a reference level
of either 115V or 26Vrms. The output signals are proportional to
the applied reference, and any distortion in the reference input
will appear in the output signals.
OUTPUT PHASING AND SCALE FACTOR
The analog output signals have phasing as shown in FIGURES
2A and 2B.
The output amplitudes simultaneously track reference voltage
fluctuations since they are proportional to RH-RL. The amplitude
factor A0 is 90/115V for 90 Vrms L-L output and 11.8/26V for
11.8 Vrms L-L output.The maximum variation in A0 from all caus-
es is ±1.9%. The term A(θ) represents the variation of the ampli-
tude with respect to the digital input angle. The scale factor vari-
ation, A(θ), is a smooth function of θ without discontinuities and
is less than ±0.001 for all values of θ. The total maximum varia-
tion in A0 (1 + A(θ)) is therefore ±2%. The low value of Aθ allows
the DSC-644 to be used to drive systems such as X-Y plotters or
CRT displays in which the sin and cos outputs are used inde-
pendently (not ratiometrically as in a control transformer).
A thermal cutout disables the output power amplifiers when the
internal temperature reaches 125°C. The output is automatically
restored when the temperature drops again.
The DSC-644 will not be damaged by any sequencing order or
interruptions in either the dc supplies or the reference input.
However, if one of the dc supplies is shut down or subsequently
powered up, maximum turn on current (450mA) will be drawn
from the other 15V supply until the missing 15V supply is
restored.
Note: RH & RL ref input is 180° out of phase with modern Synchro/Digital con-
verters per ARINC 407 compliant standard. Swap the RH & RL to the con-
verter to become 407 compliant. Also reference Synchro standards MIL-S-
20708.
The 60 Hz synchro unit requires both a converter module (DSC-
644-6) and a separate transformer because of the transformer
size. The output power amplifiers on the -6 module provide a
COS θ
S2 - S4 = V
MAX
S1-S3 = V
SINθ
+V
MAX
+ V
MAX
MAX
θ
(DEGREES)
CCW
0
360
210
330 360
150
240 300
30 60
120
0
30
90
150
210
270
330
θ
(DEGREES)
CCW
-V
MAX
S1-S3 = -V
SIN θ
MAX
- V
MAX
RESOLVER OUTPUT SIGNALS
Resolver output
S3-S2 = V
SIN(θ + 120°)
MAX
S1 - S3 = -(RH-RL) A (1+ A(θ)) sin θ
0
S2-S1 = V
SIN(θ + 240°)
S2 - S4 = (RH-RL) A (1+ A(θ)) cos θ
MAX
0
FIGURE 2A. SYNCHRO OUTPUT SIGNALS
FIGURE 2B. RESOLVER OUTPUT SIGNALS
Data Device Corporation
www.ddc-web.com
DSC-644
G-02/03-0
4
S3
ACCURACY TESTS
2/3 Z
so
The accuracy of the DSC-644 may be tested with a high accura-
cy synchro/resolver angle indicator and a load such as a control
transformer, as shown in FIGURE 5. The bit switches are set to
the desired test angles and the output angle is measured under
load. The accuracy should conform to the specifications.
Z
= R + jX
L
so
2/3 Z
2/3 Z
so
so
S1
S2
FIGURE 3. Z
MEASUREMENT
SO
REFERENCE
SYNCHRO OR
RESOLVER
SIGNALS
TABLE 3. TYPICAL CONTROL TRANSFORMERS AND
THEIR LOAD IMPEDANCES
MSB
LSB
BIT 1
DSC-644
BIT 14
S/R ANGLE
INDICATOR
AP-30711
MILITARY PART NUMBER
SIZE
Z
SO
26V 08CT4c
26V 11CT4d
11CT4e
08
11
11
15
15
18
18
23
23
100 + j490
21 + j132
838 + j4955
1600 + j9300
1170 + j6780
1420 + j13260
1680 + j5040
1460 + j11050
1250 + j3980
15CT4c
CT LOAD
15CT6b
FIGURE 5. ACCURACY TEST CIRCUIT
18CT4c
18CT6b
23CT4a
TEST METHODS
23CT6a
The DSC-644 converter modules are high-quality products.
These modules were designed to meet the specific test methods
and conditions of MIL-STD-202E (see TABLE 4) unless alterna-
tive methods are specified by the customer in the customer’s
procurement documentation.
DRIVING CT LOADS
When driving CT loads the DSC-644 must have enough power
drive capability to drive the Z of the load. Z (stator imped-
ance with rotor open-circuited) is measured as shown in FIG-
URE 3. TABLE 3 shows the load impedance of some typical con-
trol transformers.
so so
PRINTED CIRCUIT BOARD MOUNTING
When mounting a converter on a printed circuit board, it is very
important to keep logic level signals as far away from the AC and
power signals as possible. Under no circumstances should AC or
power pins be adjacent to data pins at the connector. It is also
prudent to keep the AC and power pins separated from each
other. The intent is to make it impossible to short circuit logic
inputs/outputs to AC or power pins with scope probes, etc.
Control transformers are highly inductive loads and it is possible
to save power by tuning such loads. Three capacitors may be
placed across the legs of the synchro stator in a delta configura-
tion:
S3
C
C
It is strongly recommended that circuit layouts be designed in
such a way that plated through-holes are not required when
mounting hybrid or discrete modules. If all lands connecting to
pins are located on the opposite (DIP) side of the PC board from
the module, there will be no risk of destroying a pin connection
by ripping out the plated through-hole connection if the module
has to be removed. It will also be much easier to unsolder a
module without damaging it.
S1
S2
C
FIGURE 4. DELTA TUNING CONFIGURATION
The correct value of the capacitance in Farads is given by:
X L
C =
2
4πf (R2 + XL )
TABLE 4. MIL-STD-202E TEST METHODS
where f is the carrier frequency and R and XL are the series real
and reactive components of Z . High grade capacitors must be
used and they must be able to withstand the full AC output voltage.
METHOD
CONDITION
COMMENT
so
204C
213B
106D*
107D
101D
105C
C
A
10G, 2000 Hz vibration
50G, 11ms shock
Moisture
—
A
When the load has been tuned more loads can be driven in par-
allel, because the load impedance is increased to:
Thermal shock
Salt spray
B
R2 + XL
2
B
50,000 ft, altitude
Z =
* when conformally coated on P.C. board
R
Data Device Corporation
www.ddc-web.com
DSC-644
G-02/03-0
5
.040±.0020 DIA
(TYP) x .2 MIN
3.80±.06
.30 ± .03 typ.
NON-CUMULATIVE
SILVER
DOT
NEAR PIN 1
2.3 MAX
2.0
.50 ± .06
.20 ± .03
.82 MAX
.15 MAX (TYP)
1
2
3
7
8
10 1112
9
4
6
5
1.50 MAX
TRANSFORMER
PART NUMBER 3932
4
5
1
2
0.7
1.0
1.3
TOP VIEW
2.0
2.3 MAX
6
7
6.32 NC-2B X 1/4 MIN BRASS
INSERTS (4 ON EACH SIDE)
3
.30 MAX
.25 MAX
CRES OR BRASS
INSERT 4-40 THRU (2)
BOTTOM (PIN) VIEW
PIN NUMBERS NOT
LABELED ON BOTTOM
1.90
.1.375±.01
TERMINAL ENVELOPE
MAX
.30 MAX
3.813 ± .01
4.40 MAX
4
1
2
SIDE VIEW
1
4
S1
+ S
5
Dimensions are in inches.
DETAIL OF PIN
DDC 25924
SYNCHRO
OUTPUT
90V L-L
RESOLVER
INPUT
7V
6
7
5
7
2
3
S3
S2
- S
+C
TRANSFORMER CONNECTIONS
3
Transformer
Pin Number
Connect
To
6
.096
-C
PIN NUMBERS MARKED
ON TOP FACE ONLY
TOP VIEW
S1
S3
S2
1
2
3
Synchro Output
90v rms L-L
47-440 Hz
.071
.187
.125
.035
(Dimensions in inches, ± 0.01 inch,
unless otherwise indicated.)
4
5
6
7
SIN
To
Converter
Module
GND
GND
COS
.125
TRANSFORMER CONNECTIONS
SIDE VIEW
Transformer
Pin Number
Connect
To
RH
RL
8
9
Do Not Use
Do Not Use
1
2
3
4
5
6
7
S1
S3
S2
Synchro Output
90v L-L
57-440 Hz
10
11
12
+R
RC
-R
SIN
To
PIN CALL-OUTS SHOWN
FOR REFERENCE ONLY.
GND
GND
COS
Converter
Module
*For 50Hz applications P/N DDC-3932 must be ordered.
FIGURE 6. MECHANICAL OUTLINE, 60 HZ
FIGURE 7. MECHANICAL OUTLINE, 50 HZ
EXTERNAL SYNCHRO TRANSFORMER - DDC-25924
EXTERNAL SYNCHRO TRANSFORMER - DDC-3932*
Dimensions in inches (mm).
.040 Dia
(±.002)
0.52
MAX
±
0.26 0.01
±
2.625
0.26 0.01
2.625
0.015
±
0.015
±
14 LSB
13
14 LSB
+
+
+
+
13
12
11
10
9
+
+
+
12
11
S4
S3
S2
S1
0.2±001
Non Cumulative
10
SIN
DSC-644-H
or
DSC-644-6
9
8
COS
2.60
8
+
+
3.125
±0.015
2.60
DSC-644-L
or
+15V
GND
7
6
5
4
3
2
1
7
6
5
4
3
2
+
15V
GND
DRC-644-L
+
-15V
-15V
+5V
RL
RL
RH
MSB
RH
1
MSB
0.25
(Min)
±
0.21 0.01
0.21
2.20
2.20
±0.10
±
±
0.10
0.01
SIDE VIEW
(H, L, or 6)
BOTTOM VIEW
BOTTOM VIEW
Notes:
4. Case material is glass filled Diallyl Phthalate per MIL-M-14, Type
SDG-F, except top surface is a black anodized aluminum plate for
heat transfer.
1. Pin labels on bottom view are for reference only.
2. All dimensions shown are in inches.
3. Pin material meets solderability requirements of MIL-STD-202E,
Method 208C.
5. Pin S4 is present on resolver units only.
6. Any LSB pins not used should be grounded.
FIGURE 8. DSC-644 MECHANICAL OUTLINE
Data Device Corporation
www.ddc-web.com
DSC-644
G-02/03-0
6
ORDERING INFORMATION
1. Order converter modules as follows:
400 Hz units (H and L) have an internal output transformer.
60 Hz units require an external transformer that must be ordered separately as shown below.
If a converter socket is required, order socket number 9010.
DXC–644–X–X–X
Reliability
R = Enhanced Reliability*
Operating Temperature Range of Metal Top
1 = -55°C to +85°C
3 = 0°C to +70°C
Output Voltage Level and Frequency
H = 90 Vrms L-L, 360-440 Hz (Synchro only)
L = 11.8 Vrms L-L, 360-440 Hz (Synchro or Resolver)
6 = 90 Vrms L-L, 47-440 Hz (Synchro only). See Number 2 below.
Output Type
DSC = Synchro
DRC = Resolver
2. For -6 Option:
a) For 57-440 Hz application, either the transformer P/N DDC-3932 or DDC-25924 may be used.
b) For 47-440 Hz applications, transformer P/N DDC-3932 must be used. Reference pins should not be connected.
* “R” option only available in -55°C to +85°C temperature range (Option “1”).
Enhanced Reliability processing provides an additional 160 hour, 105°C burn-in and temperature cycling in accordance with MIL-
STD-202.
Data Device Corporation
www.ddc-web.com
DSC-644
G-02/03-0
7
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.
105 Wilbur Place, Bohemia, New York, U.S.A. 11716-2482
For Technical Support - 1-800-DDC-5757 ext. 7382
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)8141-349-087, Fax: +49-(0)8141-349-089
Japan - Tel: +81-(0)3-3814-7688, Fax: +81-(0)3-3814-7689
World Wide Web - http://www.ddc-web.com
U
®
DATA DEVICE CORPORATION
REGISTERED TO ISO 9001
FILE NO. A5976
G-02/03-0
8
PRINTED IN THE U.S.A.
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