DSC-11524
16-BIT HYBRID D/S AND D/R
CONVERTER PIN PROGRAMMABLE
FOR SYNCHRO OR RESOLVER OUTPUT
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FEATURES
• 15 mA RMS Output
• 11.8 VL-L Synchro, 11.8 VL-L
Resolver, or 6.81 VL-L Resolver Output
• 8 Bit/2 Byte Double-Buffered
Transparent Latches
• Pin Programmable for Synchro or
Resolver Output
• 16-Bit Resolution
• Complete D/S and D/R Converter
• Mate to DSC-36020 IBM® PC Card
• DC-Coupled Reference Accepts Any
Waveform
DESCRIPTION
The DSC-11524 is a versatile multiplying Digital-to-Synchro/Resolver converter.
The digital input represents an angle, and the output is pin programmable for
either Resolver, SIN/COS, or three-line synchro type output. The reference input
will accept any waveform, even a sawtooth for CRT drive. Because the reference
is DC coupled to the output, the DSC-11524 can be used in many configurations,
such as: a Digital-to-Synchro/Resolver converter using a sinusoidal reference as
an input; a Digital-to-SIN/COS DC converter using a DC reference; a polar-to-
rectangular converter using a reference input proportional to the radius vector; a
rotating cartwheel sweep generator for PPI displays using a sawtooth refer-
ence.
Packaged in a 36-pin DDIP, the DSC-11524 is a complete D/S and D/R con-
verter in one hybrid module. Hybrid technology results in low weight, low power
consumption, very high reliability, and a wide operating temperature range. The
DSC-11524 circuit design allows for higher accuracy and reduces the output
scale factor variation so that the output can drive displays directly. The output
line-to-line voltage can be scaled by external resistors. Other features include
high AC and DC common mode rejection at the reference input, and output short
circuit protection.
• Generates SIN/COS DC or Rotating
PPI Sweep
• High-Rel CMOS D/R Chip
• No +5 V Supply Required
• LVDT Simulation
APPLICATIONS
Because of its high reliability, small size and low power consumption the hybrid
DSC-11524 is ideal for the most stringent and severe industrial and military
ground or avionics applications. All units are available with MIL-PRF-38534 pro-
cessing as a standard option.
Among the many possible applications are computer-based systems in which
digital information is processed, such as simulators, flight trainers, flight instru-
mentation, fire control systems, radar and navigation systems, and PPI displays
including moving target indicators.
FOR MORE INFORMATION CONTACT:
Data Device Corporation
105 Wilbur Place
Bohemia, New York 11716
631-567-5600 Fax: 631-567-7358
www.ddc-web.com
Technical Support:
1-800-DDC-5757 ext. 7771
All trademarks are the property of their respective owners.
©
1998, 1999 Data Device Corporation
Data Device Corporation
www.ddc-web.com
TEST POINT -R
D/R
CONVERTER
S1
S2
´
S2
S3
S3
´
S4
SYNCHRO OR
RESOLVER
OUTPUT
(PIN JUMPER
PROGRAMMABLE)
HIGH ACCURACY
LOW SCALE FACTOR
VARIATION
REFERENCE
CONDITIONER
BITS 1-16
TRANSPARENT LATCH
TRANSPARENT LATCH
ELECTRONIC
SCOTT-T OR
RESOLVER
SCALING
OUTPUT
AMPLIFIERS
LA
LM
BITS 1-8
BITS 9-16
DIGITAL INPUTS
LL
REFERENCE
INPUTS
100 K
RH/RL 26 V
100 K
5K
RH'/RL' ADJUSTABLE
1.3-26 V
5K
2
DSC-11524
M-5/09-0
FIGURE 1. DSC-11524 BLOCK DIAGRAM
tABLE 1. DSC-11524 SpECIFICAtIOnS
Apply over temperature range, power supply range, reference voltage and frequency range, and 10% harmonic distortion in the reference.
pARAMEtER
RESOLUtIOn
ACCURACY and DYnAMICS
Output Accuracy
Differential Linearity
Output Setting Time
DIGItAL InpUt
Logic Type
Logic Voltage Level
Load Current
µA
UnIt
Bits
VALUE
16
Minutes ±4 to ±2 min. (See Ordering Information.)
LSB
±1 max
µsec
Less than 20 for any digital step change
Natural binary angle, parallel positive logic CMOS and TTL compatible.
Inputs are CMOS transient protected.
Logic 0 = 0 to +0.8 V
Logic 1 = 2 V to 1/3 of V
DD
+10%
20 max (bits 1-16)
65 max (LL, LM, LA)
See Timing Diagrams (FIGURES 2A/2B.).
REFEREnCE InpUt
Type
Frequency Range
Voltage
Hz
V
Two differential solid-state inputs: one for standard 26 V, one programmable.
DC to 1k
Standard Input programmable Input
26 (Note 1)
1.3 minimum for full output;
higher voltages are
scaled by adding two
series resistors
100 ±0.5%
200 ±0.5%
5 ±0.5%
10 ±0.5%
Input Impedance
Single Ended
Differential
AnALOG OUtpUt
Type
Output Current
Output Voltage
Synchro mode
Resolver mode
Transform. Ratio Tol. + Scale Factor Varation
DC Offset
(Each Line to Gnd)
pOwER SUppLIES
Voltage
Max voltage without damage
Max Current or Impedance
tEMpERAtURE RAnGES (CASE)
Operation
-1 Option
-3 Option
Storage
phYSICAL ChARACtERIStICS
Type
Size
Weight
k ohm
k ohm
Pin programmable for synchro or resolver
mA rms 15 max
(Tracks Reference Input Voltage)
Vrms
L-L
11.8 nominal
Vrms
L-L
6.81 or 11.8 nominal
%
±0.6 max
mV
±15 max. Varies with input angle.
V
mA
+15 ± 5%
-15 ± 5%
+18 V
-18 V
35+ load current 35+ load current
°C
°C
°C
-55 to +125
0 to +70
-55 to +135
36-pin DDIP
0.78 x 1.9 x 0.21 (19.7 x 48.3 x 5.3)
0.85 (24)
in.(mm)
oz. (g)
Notes: 1) Maximum reference input voltage for RH/RL is 26 V +10%.
2) Differential is Line-to-Line (L-L); single-ended is Line-to-Ground (L-Gnd).
Data Device Corporation
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3
DSC-11524
M-5/09-0
INTRODUCTION
As shown in FIGURE 1, the signal conversion in the DSC-11524
is performed by a high-accuracy Digital-to-Resolver converter
whose SIN and COS outputs have a low scale factor variation as
a function of the digital input angle. This resolver output is either
amplified by scaling amplifiers for resolver output, or is both
amplified and converted to a synchro output by an electronic
Scott-T. In both cases the output line currents can be 15 mA rms
max, which is sufficient for driving S/D converters, solid-state
control transformers and displays. Output power amplifiers will
be required, however, for driving electromechanical devices such
as synchros and resolvers.
The reference conditioner has a differential input with high ac
and DC common mode rejection, so that a reference isolation
transformer will seldom be required. There are two sets of refer-
ence inputs. The RH, RL input provides the maximum synchro or
resolver output voltage for a standard 26 V rms reference input.
The RH´, RL´ input is used to scale the output for other reference
voltage levels. Series resistors can be added to the reference
input as described below, either to accommodate higher refer-
ence levels, or to reduce the output level. The reference condi-
tioner output -R is intended for test purposes. A signal between
6 V and 7.5 V at -R indicates that a reference input signal is pres-
ent.
DIGITAL INPUT
The converter contains three input latches. The input is con-
trolled by LM and LL. Each of these enable the converter to
interface with an 8-bit bus. LM controls bits 1-8 and LL controls
bits 9-16. Ensure that the data is stable for 50ns before enabling
a latch (LL, LM), and allow 100ns for the latch to input the data.
Input Bit Weights are as follows:
BIT 1, MSB = 180 degrees
Bit 16, LSB = 0.0054 degrees (See Table 2)
POWER SUPPLY CYCLING
Power supply cycling of the DDC converter should follow the
guidelines below to avoid any potential problems.
Strictly maintain proper sequencing of supplies and signals per
typical CMOS circuit guidelines:
- Apply power supplies first (+15V, -15V and Ground).
- Apply analog signals last.
The reverse sequence should be followed during power down
of the circuit.
tABLE 2. AnGLES In DEGREES CROSS REFEREnCED tO A
16-BIt DIGItAL wORD
DEGREES (hEx)
1
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
1
1
1
1
16 BIt DIGItAL wORD (φ) (1 = MSB, 16 = LSB)
2 3 4
0 0 0
0
0
0
0
0
1
1
1
0
0
1
1
1
0
1
1
1
1
0
0
1
1
1
0
0
0
1
0
1
0
0
0
1
0
1
1
1
0
1
0
0
1
0
1
5
0
6
0
0
1
0
0
1
1
0
1
0
0
0
0
0
1
0
1
0
1
1
7
0
1
0
0
1
0
1
0
0
0
0
1
0
1
0
0
1
1
0
1
8
0
0
1
0
0
1
0
1
0
0
0
0
0
1
0
1
0
1
1
9 10 11 12 13 14 15 16
0 0 0 0 0 0 0 0
1
0
0
1
0
1
0
0
0
0
0
1
0
1
0
0
1
1
0
1
0
1
0
0
1
0
1
0
0
0
0
0
1
1
0
0
1
1
1
0
0
1
1
0
0
0
0
0
1
0
0
0
1
0
1
0
1
0
1
0
0
1
1
0
1
0
0
0
0
0
1
1
0
0
1
1
1
0
0
1
1
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
0
1
0
1
0
0
0
0
0
1
1
0
0
1
1
1
0
0
1
1
0
0
0
0
0
1
0
1
0
1
0
1
0
1
1
1
0
1
1
0
1
0
0
1
0
1
1
1
0
1
1
1
0° (0000)
15° (0AAB)
30° (1555)
45° (2000)
60° (2AAB)
75° (3666)
90° (4000)
120°
135°
180°
240°
270°
285°
300°
(5555)
(6000)
(8000)
(AAAB)
(C000)
(CAAB)
(D555)
315° (E000)
330° (EAAB)
345° (F555)
359° (FFFF)
1
0
0
1
0
1
0
0
0 0
0 0
0 1
0 0
0 1
1 0
0 0
1 1
0 1
1 0
1 1
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DSC-11524
M-5/09-0
OUTPUT SCALING AND REF LEVEL ADJUSTMENT
The DSC-11524 operates like a multiplying D/A converter in that
the voltage of each output line is directly proportional to the refer-
ence voltage. The maximum line-to-line levels are determined by
the output amplifiers and are nominally 11.8 V for synchro output
and 6.81 V or 11.8 V for resolver output. The RH, RL reference
input is designed to provide this nominal output for the standard
26 V reference level. The scaling adjustment is made by two
internal 100k ohm resistors in series with the reference condi-
tioner input (see FIGURE 1).
The RH´, RL´ reference input has only 5k ohm internal resistors
in series with the reference conditioner input, so that nominal
line-to-line output is obtained for a reference input of 1.3 V. For
higher reference voltages, two resistors, R’, must be inserted in
series with the inputs. These resistors scale the DSC-11524 to
accommodate higher reference levels, or to reduce the output
levels. The magnitude of the resistors, R´, in ohms is calculated
as follows:
R' =
5K
1.3
(V
RH' RL'
x
NOM V
LL
- 1.3)
DESIRED V
LL
V
RH' RL'
= Reference Input Voltage to Pins 11 & 9
NomV
LL
= Analog Output Voltage (L-L) Configuration as per Figure 4
Desired V
LL
= Scaled Analog Output Voltage
Example to scale reference input RH'/RL' to 115 Vrms
(Configured for 11.8V nominal output)
R' =
5K
1.3
(115
x
11.8
11.8
- 1.3)
R'
≈
437KΩ
R'
115V
R'
RH' PIN 11
DSC-11524
RL' PIN 9
11.8V
L-L
OUTPUT
Example to scale Output Voltage line-to-line of 9 volts
(Configured for 115V Reference Input )
R' =
5K
1.3
(115 x
11.8
9
- 1.3)
R' = 575 KΩ
R'
115V
R'
RH' PIN 11
DSC-11524
RL' PIN 9
9 V
L-L
OUTPUT
Output Voltage Scaling without external R' resistors.
The Output Voltage can be scaled down from the nominal voltage L-L.
Input/Output ratio is 0.45 for the RH/RL 26V Reference Input.
Example to scale a 9V L-L Output using the 26V RH/RL Reference Voltage
on Input pins 10 & 8.
REF INPUT VOLTAGE =
Desired Output (L-L)
0.45
=
9
0.45
REF INPUT VOLTAGE = 19.8V
R'
19.8V
R'
RH' PIN 10
DSC-11524
RL' PIN 8
9 V
L-L
OUTPUT
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5
DSC-11524
M-5/09-0
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