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RD-19230 Schematic ( PDF Datasheet ) - Data Device

Teilenummer RD-19230
Beschreibung 16-Bit Monolithic Tracking Resolver to Digital Converter
Hersteller Data Device
Logo Data Device Logo 




Gesamt 22 Seiten
RD-19230 Datasheet, Funktion
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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






RD-19230 Datasheet, Funktion
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The open loop transfer function is as follows:
GENERAL SETUP CONDITIONS
( )A2
S
B
+1
( )Open Loop Transfer Function =
S2
S
10B
+1
(Note: For detailed application and technical information see the RDC-19220 &
RD-19230 series converter applications manual (Document # MN-19220XX-001)
which is available for download from the DDC web site at www-ddc-web.com.)
where A is the gain coefficient and A2=A1A2
and B is the frequency of lead compensation.
The components of gain coefficient are error gradient, integrator
gain, and VCO gain. These can be broken down as follows:
DDC has external component selection software which consid-
ers all the criteria below. In a simple fashion, it asks the key sys-
tem parameters (carrier frequency, resolution, bandwidth, and
tracking rate) needed to derive the external component values.
The following recommendations should be considered when
installing the RD-19230 R/D converter:
- Error Gradient = 0.011 volts per LSB (CT + Error Amp + Demod
with 2 Vrms input)
1) In setting the bandwidth (BW) and Tracking Rate (TR) (select-
ing five external components), the system requirements need
- Integrator Gain = Cs Fs volts per second per volt
1.1 CBW
- VCO Gain =
1
LSBs per second per volt
1.25 RV CVCO
where: Cs = 10 pF
Fs = 67 kHz when R CLK = 30 k
CVCO = 50 pF
to be considered. For the greatest noise immunity, select the
minimum BW and TR the system will allow. Selecting a fBW
that is too low relative to the maximum application tracking
rate can create a spin-around condition in which the convert-
er never settles. The relationship to insure against this condi-
tion is detailed in TABLE 2. Verify your system does not
exceed this parts dynamic specs RATIO = RPS/BW. Perform
this calculation and verify the ratio does not exceed TABLE 2.
RV, RB, and CBW are selected by the user to set velocity scaling
et4U.comand bandwidth.
TABLE 2. TRACKING / BW RELATIONSHIP
DataSheet4U.com RPS (MAX)/BW
RESOLUTION
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1 10
0.50 12
0.25 14
0.125
16
GAIN = 4
OPEN LOOP
BA
(B = A/2)
(CRITICALLY DAMPED)
2A
ω (rad/sec)
-6 db/oct
10B
GAIN = 0.4
CLOSED LOOP
fBW = BW (Hz) =
2A
π
2A
2 2A
ω (rad/sec)
2) Power supplies are ±5 VDC. For lowest noise performance it
is recommended that a 0.1 µF or larger cap be connected
from each supply to ground near the converter package.
When using +5V and -5V supplies to power the converter,
pins 23, 24, 26 and 27 must be no connection.
3) There are two internal ground planes to reduce noise to the
analog input due to digital ground currents. The resolver
inputs and velocity output are referenced to AGND. The digital
inputs and outputs are referenced to GND. The AGND and
GND pins must be tied together as close to the package as
possible, or unstable results may occur.
4) This device has several high impedance amplifier inputs
(+C, -C, +S, -S, -VCO, VEL SJ1, and VEL SJ2) that are sensi-
tive to noise coupling. External components should be con-
nected as close to the converter as possible.
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FIGURE 4. BODE PLOTS
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6 RD-19230
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RD-19230 pdf, datenblatt
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RESOLVER
INPUT
S1 1
S3 6
S4 16
S2 7
Ri
Ri
A GND
Ri
Ri
8 10
SIN
3
Rf
-S
2
+S
5
Rf
4
COS
13
Rf
-C
15
+C
Rf
12
-
+
-
+
CONVERTER
Examples of Component Calculations:
(1) 2V in, need gain of 1, use 10k for R1 &R2
Gain = RF
Ri
(2) 4V in, need gain of 0.5, Ri = 20k, Rf = 10k
To Calculate Ri:
Select 10k for Rf
Ri = Rf x 0.5 (input L-L volt)
Ri = 10k x 0.5 x (L-L volt)
Note: The external BW components
as shown in Figures 1 and 2
are necessary for the R/D to
function.
et4U.com
S1 and S3, S2 and S4, and RH and RL should be ideally twisted shielded, with the shield tied to GND at the converter.
For DDC-49530: Ri = 70.8 K, 11.8 V input, synchro or resolver.
For DDC-49590: Ri = 270 K, 90 Volt input, synchro or resolver.
Maximum additional error is 1 minute.
When using discrete resistors: Resolver L-L voltage =
Ri
Rf
x 2 Vrms, where Rf 6 kΩ.
For 2V direct input, use 10kmatched resistors for Ri and Rf.
Input options affect DC offset gains and therefore carrier frequency ripple and jitter. Offset gains associated with differential mode
(offset gain for differential configuration = 1+Rf/Ri) and direct mode (offset gain for direct configuration = 1) show differential mode
will always be higher. Higher DC offsets cause higher carrier frequency ripple due to the demodulation process. This carrier frequency
ripple rides on top of the DC error signal, causing jitter. A higher carrier frequency versus bandwidth ratio will help to decrease ripple
and jitter associated with offsets. In summary, R/Ds with differential inputs are more susceptible to offset problems than R/Ds in
single-ended mode. R/Ds in higher resolutions, such as 16 bit, will further compound offset issues due to higher internal voltage
gains. Although the differential configuration has a higher DC offset gain, the differential configuration's common mode noise rejection
makes it the preferred input option. The tradeoffs should be considered on a design to design basis.
FIGURE 13. DIFFERENTIAL RESOLVER INPDUaTt,aUSShIeNeGt4UDD.cCom-49530/57470 (11.8 V) OR DDC-49590 (90 V),
DDC-73089 (2 V) USING DISCRETE RESISTORS
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SYNCHRO
INPUT
S1
S3
S2
1 Ri
SIN
3
Rf
-S
2
6 Ri
+S
5
Rf
A GND 4
16 R i
7 Ri 8
15
9 Ri /2
COS
14
Rf / 3
-C
15
+C
10
Rf / 3
11
-
+
Note: The external BW components
as shown in Figures 1 and 2
are necessary for the R/D to
function.
-
+
CONVERTER
S1, S2, S3 should be triple twisted shielded; RH and RL should be twisted shielded;
In both cases the shield should be tied to GND at the converter.
11.8 Volt input = DDC-49530: Ri = 70.8 K, 11.8 V input, synchro or resolver.
90 Volt input = DDC-49590: Ri = 270 K, 90 Volt input, synchro or resolver.
Maximum additional
When using discrete
ererrsoirstiosr1s:mRiensuotelvuesr iLn-gLrveoclotamgme e=ndRReifd
thin film package.
x 2 Vrms, where Rf
6
k
FIGURE 14. SYNCHRO INPUT, USING DDC-49530/57470 (11.8 V), DDC-49590 (90 V) OR DDC-73089 (2V)
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Data Device Corporation
RD-19230
www.ddc-web.com
12
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