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PDF RD-19230 Data sheet ( Hoja de datos )
| Número de pieza | RD-19230 | |
| Descripción | 16-Bit Monolithic Tracking Resolver to Digital Converter | |
| Fabricantes | Data Device | |
| Logotipo |  |
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RD-19230
16-BIT MONOLITHIC TRACKING
RESOLVER-TO-DIGITAL CONVERTER
DESCRIPTION
The RD-19230 is a small and versatile, low cost, state-of-the-art 16-
bit monolithic Resolver-to-Digital Converter. This single chip convert-
er offers programmable features such as resolution, bandwidth,
velocity output scaling and encoder emulation.
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Resolution programming allows selection of 10, 12, 14, or 16 bit, with
accuracies to 1.3 minutes. The parallel digital data and the internal
encoder emulation signals (A QUAD B) have independent resolution
control. Internal encoder emulation will permit inhibiting (freezing) the
parallel digital data without interrupting the A and B outputs.
The internal Synthesized Reference section eliminates errors due to
quadrature voltage and ensures operation with a rotor-to-stator phase
shift of up to 45 degrees. The velocity output (VEL) can be used in
place of a tachometer. It has a range of ±4 V relative to analog
ground. The velocity scale factor/tracking rate is programmed with a
single resistor. This converter provides the option of using a second
set of filter components which can be used in dual bandwidth or
switch on the fly applications.
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FEATURES
• Accuracy up to 1.3 Arc Minutes
• Internal Synthesized Reference
• +5 Volt Only Option
• Programmable Resolution, Dual
Bandwidth and Tracking Rate
• Internal Encoder Emulation with
Independent Resolution Control
• Differential Resolver Input Mode
• Velocity Output Eliminates
Tachometer
• Built-In-Test (BIT) Output, No 180°
Hangup with AC Reference
• -40° to +85°C Operating Temperature
• Programmable for LVDT Input
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APPLICATIONS
With its low cost, small size, high accuracy, and versatile perfor-
mance, the RD-19230 converter is ideal for use in modern high per-
formance industrial control systems. It is ideal for users who wish to
use a resolver input in their encoder based system. Typical applica-
tions include motor control, machine tool control, robotics, and
process control.
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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
© 1998, 1999 Data Device Corporation
1 page  
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THEORY OF OPERATION
The RD-19230 is a mixed signal CMOS IC containing analog
input and digital output sections. Precision analog circuitry is
merged with digital logic to form a complete high-performance
tracking resolver-to-digital converter. For user flexibility and con-
venience, the converter bandwidth, dynamics, and velocity scal-
ing are externally set with passive components.
The RD-19230 Functional Block Diagram is shown in FIGURE 1.
The analog conversion electronics require ±5 VDC power sup-
plies, and the converter contains a charge pump to provide the
user with the option of a single-ended +5 VDC supply. The con-
verter front-end consists of differential sine and cosine input
amplifiers which are protected up to ±25 V with 2 kΩ resistors
and diode clamps to the ±5 VDC supplies. By performing the fol-
lowing trigonometric identity, SINθ(COSφ) - COSθ(SINφ) =
SIN(θ−φ), the Control Transformer (CT) compares the analog
input signals ( θ ) with the digital output ( φ ), resulting in an error
signal proportional to the sine of the angular difference. The CT
uses a combination of amplifiers, switches, logic and capacitors
in precision ratios to perform the calculation.
Note: The error output of the CT is normally sinusoidal, but
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in LVDT mode, it is triangular (linear) and can be used
to convert any linear transducer output.
The converter accuracy is limited by the precision of the com-
puting elements in the CT. Instead of a traditional precision resis-
tor network, this converter uses capacitors with precisely con-
trolled ratios. Sampling techniques are used to eliminate errors
due to voltage drift and op-amp offsets.
The error processing is performed using the industry standard
technique for Type II tracking converters. The DC error is inte-
grated yielding a velocity voltage which in turn drives a voltage
controlled oscillator (VCO). This VCO is an incremental integra-
tor (constant voltage input to position rate output) which, togeth-
er with the velocity integrator, forms a Type II servo feedback
loop. A lead in the frequency response is introduced to stabilize
the loop and another lag at higher frequency is introduced to
reduce the gain and ripple at the carrier frequency and above.
The settings of the various error processor gains and break fre-
quencies are done with external resistors and capacitors so that
the converter loop dynamics can be easily controlled by the user.
TRANSFER FUNCTION AND BODE PLOT
The dynamic performance of the converter can be determined
from its Transfer Function Block Diagrams and Bode Plots (open
and closed loop). These are shown in FIGURES 2, 3, and 4.
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VEL
CBW /10
RV
VEL SJ1
RESOLVER
INPUT
(θ)
CT
+
-
GAIN
DEMOD
R1
1
CS FS
11 mV/LSB
VEL -VCO
50 pf
C VCO
±1.25 V
THRESHOLD
VCO
16 BIT
UP/DOWN
COUNTER
H=1
DIGITAL
OUTPUT
(φ)
FIGURE 2. TRANSFER FUNCTION BLOCK DIAGRAM #1
RESOLVER
INPUT
(θ)
CT
+e
-
ERROR PROCESSOR
A1
S
B
+1
S S +1
10B
VCO
A2
S
VELOCITY
OUT
DIGITAL
POSITION
OUT (φ)
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H=1
FIGURE 3. TRANSFER FUNCTION BLOCK DIAGRAM #2
5
RD-19230
P-05/05-0
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EXTERNAL
REF
LO HI
R1
R3
R2
R4
See Note 3.
S3
S1
S2
S4
RESOLVER
See Note 3.
+S
-S
SIN
COS
-C
+C
RL RH
Note: The external BW components
as shown in Figures 1 and 2
are necessary for the R/D to
function.
A GND
GND
1) Resistors selected to limit Vref peak to between 1.5 V and 5 V.
2) External reference LO is grounded, then R3 and R4 are not
needed, and -R is connected to GND.
3) 10k ohms, 1% series current limit resistors are recommended.
FIGURE 11. TYPICAL CONNECTIONS, 2 V RESOLVER, DIRECT INPUT
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R1
S3
R2
S1
R1
S2
R2
S4
R2 = 2
R1 + R2 X Volt
R1 + R2 should not load the Resolver; it is recommended to use an R2 = 10 kΩ
R1 + R2 Ratio errors will result in Angular errors,
2 cycle, 0.1% Ratio error = 0.029˚ Peak Error.
+S -S SIN
Note: The external BW components
as shown in Figures 1 and 2
are necessary for the R/D to
+C function.
A GND
GND
-C COS
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FIGURE 12. TYPICAL CONNECTIONS, X- VOLT RESOLVER, DIRECT INPUT
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11
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RD-19230
P-05/05-0
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet RD-19230.PDF ] | |
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