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參數(shù)資料
| 型號： | SD-14531D4-825 |
| 廠商： | DATA DEVICE CORP |
| 元件分類： | 位置變換器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, MDMA36 |
| 封裝： | KOVAR, DDIP-36 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 170K |
| 代理商： | SD-14531D4-825 |
4
Data Device Corporation
www.ddc-web.com
SD-14531
VALUE
Notes:
(1) Pin Programmable.
(2) VEL polarity is negative voltage for positive angular rate.
(3) XX5 ordering option = ±1.3 minutes resolver mode, ±1.6 minutes synchro
mode (16-bit mode only).
TRANSFORMER
CHARACTERISTICS (CONT.)
Minimum Input impedances
(Balanced)
90 V L-L
26 V L-L
11.8 V L-L
60 Hz TRANSFORMERS
Reference Transformer
Carrier Frequency Range
Input Voltage Range
Input Impedance
Input Common-Mode Voltage
Output Description
Output Voltage
Power Required
Signal Transformer
Carrier Frequency Range
Input Voltage Range
Input Impedance
Input Common-Mode Voltage
Output Description
Output Voltage
Power Required
PARAMETER
TABLE 1. SD-14531 SPECIFICATIONS (CONT.)
accuracy of the converter. The control transformer performs the
following trigonometric computation:
sin(
θ - φ) = sinθ cosφ - cosθ sinφ
Where:
θ is angle theta representing the resolver shaft position
φ is digital angle phi contained in the up/down counter
The tracking process consists of continually adjusting
φ to make
(
θ - φ) = 0, so that φ will represent the shaft position θ.
The output of the demodulator is an analog DC level proportion-
al to sin(
θ - φ). The error processor receives its input from the
demodulator and integrates this sin(
θ - φ) error signal which then
drives the VCO. The VCO’s clock pulses are accumulated by the
up/down counter. The velocity voltage accuracy, linearity and off-
set are determined by the quality of the VCO. Functionally, the
up/down counter is an incremental integrator. Therefore, there
are two stages of integration which makes the converter a Type
II tracking servo.
In a Type II servo, the VCO always settles to a counting rate
which makes d
φ/dt equal to dθ/dt without lag. The output data will
always be fresh and available as long as the maximum tracking
rate of the converter is not exceeded.
The reference conditioner is a comparator that produces the
square wave reference voltage which drives the demodulator. It’s
single-ended Input Z is 250k Ohms min, 500k Ohms differential.
SPECIAL FUNCTIONS
The synthesized reference section of the SD-14531 eliminates
errors caused by quadrature voltage. Due to the inductive nature
of synchros and resolvers, their signals typically lead the refer-
ence signal (RH and RL) by about 6°. When an uncompensated
reference signal is used to demodulate the control transformer’s
output, quadrature voltages are not completely eliminated. In a
14-bit converter it is not necessary to compensate for the refer-
ence signal’s phase shift. A 6° phase shift will, however, cause
problems for the one minute accuracy converters. As shown in
FIGURE 1, the converter synthesizes its own cos(
ωt + α) refer-
ence signal from the sin
θ - cos(ωt + α), cosθ - cos(ωt + α) signal
inputs and from the cos
ωt reference input. The phase angle of
the synthesized reference is determined by the signal input. The
reference input is used to choose between the +180° and -180°
phases. The synthesized reference will always be exactly in
phase with the signal input, and quadrature errors will therefore
be eliminated. The synthesized reference circuit also eliminates
the 180° false error null hangup.
Quadrature voltages in a resolver or synchro are by definition the
resulting 90° fundamental signal in the nulled out error voltage
THEORY OF OPERATION
The SD-14531 Series are small, 36-pin DDIP synchro-to-digital
hybrid converters. As shown in the block diagram (FIGURE 1),
the SD-14531 can be broken down into the following functional
parts: Signal Input Option, Converter, Analog Conditioner, Power
Supply Conditioner, and Digital Interface.
CONVERTER OPERATION
As shown in FIGURE 1, the converter section of the SD-14531
contains a high accuracy control transformer, demodulator, error
processor, voltage-controlled oscillator (VCO), up-down counter,
and reference conditioner. The converter produces a digital
angle which tracks the analog input angle to within the specified
SynchroZIN(ZSO)
ResolverZIN
180
100 k
-
30 k
20 k
30 k
47 - 440 Hz
80 -138 V rms; 115 V rms
nominal resistive
600 k
min, resistive
500 V rms transformer isolated
+R (in phase with RH-RL) and -R
(in phase with RL- RH) derived
from op-amps. Short-Circuit proof.
3.0 V nominal riding on ground
reference V. Output Voltage level
tracks input level.
4 mA typ, 7 mA max from +15 V
supply.
47 - 440 Hz
10 -100 V rms L- L; 90 V rms
L- L nominal
148 k
min L- L balanced
resistive
±500 V rms, transformer isolated
Resolver output,
- Sine (- S) + Cosine (+C) derived
from op-amps. Short circuit proof.
1.0 V rms nominal riding on
ground reference V. Output volt-
age level tracks input level.
4 mA typ, 7 mA max from +15 V
supply.
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