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PDF RDC-19220 Data sheet ( Hoja de datos )

Número de pieza RDC-19220
Descripción 16-BIT MONOLITHIC TRACKING RESOLVER (LVDT)-TO-DIGITAL CONVERTERS
Fabricantes Data Device Corporation 
Logotipo Data Device Corporation Logotipo



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No Preview Available ! RDC-19220 Hoja de datos, Descripción, Manual

RDC-19220/2/4 SERIES
16-BIT MONOLITHICTRACKING RESOVLER
(LVDT)-TO-DIGIAT L CONVERTERS
DESCRIPTION
The RDC-19220 Ser ies of con verters are lo w-cost, v ersatile, 16-bit
monolithic, state-of-the-ar t Resolv er(/LVDT)-to-Digital Con verters.
These single-chip con verters are a vailable in small 40-pin DDIP, 44-
pin J-Lead, and 44-pin MQFP packages and offer programmable fea-
tures such as resolution, bandwidth and v elocity output scaling.
Resolution programming allows selection of 10-, 12-, 14-, or 16-bit,
with accur acies to 2.3 min. This feature combines the high tr acking
rate of a 10-bit con verter with the precision and lo w-speed velocity
resolution of a 16-bit converter in one package.
The velocity output (VEL) from the RDC-19220 Ser ies, which can be
used to replace a tachometer, is a 4 V signal (3.5 V with the +5 V only
option) referenced to ground with a linearity of 0.75% of output voltage.
The full scale value of VEL is set by the user with a single resistor.
RDC-19220 Series converters are a vailable with oper ating tempera-
ture ranges of 0° to +70°C, -40° to +85°C and -55° to +125°C. Military
processing is available.
Make sure the next
Card you purchase
has...
®
FEATURES
+5 Volt Only Option
Only Five External Passive
Components
Programmable:
- Resolution: 10-, 12-, 14-, or 16-Bit
- Bandwidth: to 1200 Hz
- Tracking: to 2300 RPS
Differential Resolver and LVDT
Input Modes
Velocity Output Eliminates
Tachometer
Built-In-Test (BIT) Output
No 180° Hang-Up
Small Size: Available in DDIP, PLCC or
MQFP Packages
-55° to +125°C Operating
Temperature Available
Programmable for LVDT input
APPLICATIONS
With its low cost, small size, high accuracy and versatile performance,
the RDC-19220 Series converter is ideal for use in modern high-per-
formance industrial and militar y control systems. Typical applications
include motor control, r adar antenna positioning, machine tool con-
trol, robotics , and process control. MIL-PRF-38534 processing is
available for military applications.
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
© 1999 Data Device Corporation
http://www.Datasheet4U.com

1 page




RDC-19220 pdf
er with the velocity integrator forms a type II servo feedback loop.
A lead in the frequency response is introduced to stabiliz e the
loop and another lag at higher frequency is introduced to reduce
the gain and r ipple at the carr ier frequency and abo ve. The set-
tings of the various error processor gains and break frequencies
are done with e xternal resistors and capacitors so that the con-
verter loop dynamics can be easily controlled b y the user.
TRANSFER FUNCTION AND BODE PLOT
The dynamic perof rmance of the converter can be detemr ined from
its Transfer Function Block Diagrams and its Bode Plots (open and
closed loop).These are shown in FIGURES 2, 3, and 4.
The open loop transfer function is as follows:
( )A2
S
B
+1
( )Open Loop Transfer Function = S2 1S0B+1
GENERAL SETUP CONSIDERATIONS
Note: For detailed application and technical information see the RD/RDC convert-
er applications man ual which is a vailable for download from the DDC w eb site @
www.ddc-web.com.
DDC has e xternal component selection softw are which consid-
ers all the cr iteria below, and in a simple f ashion, asks the k ey
parameters (carrier frequency, resolution, bandwidth, and tr ack-
ing rate) to derive the external component value.
The f ollowing recommendations should be considered when
installing the RDC-19220 Series R/D converters:
1) In setting the bandwidth (BW) and Tracking Rate (TR) (select-
ing five external components), the system requirements need
to be considered. For greatest noise immunity, select the min-
imum BW and TR the system will allow.
2) +5 and -5 volt operation:
where A is the gain coefficient and A 2= 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:
- Error Gradient = 0.011 volts per LSB (CT + Error Amp + Demod
with 2 Vrms input)
- 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 Rs = 30 k
Fs = 100 kHz when Rs = 20 k
Fs = 134 kHz when Rs = 15 k
CVCO = 50 pF
RV, RB, and CBW are selected by the user to set velocity scaling
and bandwidth.
Power supplies are ±5 V dc. For lowest noise performance it
is recommended that a 0.1 µF or larger cap be connected
from each supply to g round near the con verter pac kage.
When using a +5V and -5V supply to po wer the con verter,
RDC-19222 pins 22, 23, 25, 26 m ust be no connection, and
on RDC-19224 pins 20, 40, 16, 11, m ust be no connection.
Also, the 10uF cap is not connected to +cap and -cap pins .
3) This con verter has 2 inter nal g round planes , which reduce
noise to the analog input due to digital g round currents. The
resolver inputs and v elocity output are ref erenced to A GND.
The digital outputs and inputs are ref erenced to GND . The
AGND and GND pins m ust be tied together as close to the
converter pac kage as possib le. Not shor ting these pins
together as close to the con verter pac kage as possib le will
cause unstable converter results.
RESOLVER
INPUT
(θ)
CT
+e
-
ERROR PROCESSOR
A1
S
B
+1
S S +1
10B
VCO
A2
S
H=1
VELOCITY
OUT
DIGITAL
POSITION
OUT (φ)
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)
FIGURE 3. TRANSFER FUNCTION
BLOCK DIAGRAM #2
Data Device Corporation
www.ddc-web.com
5
FIGURE 4. BODE PLOTS
RDC-19220 SERIES
R-12/05-0

5 Page





RDC-19220 arduino
S1
S3
RESOLVER
INPUT
S4
S2
SIN
Ri
Rf
-S
-
R i +S
+
Rf
A GND
COS
Ri Rf
Ri
8 10
Rf
-C -
+C +
CONVERTER
Note: The five external BW components as
shown in FIGURE 1 and 2 are necessar y
for the R/D to function.
Ri x 2 Vrms = Resolver L-L rms voltage
Rf
Rf ≥ 6 k
S1 and S3, S2 and S4, and RH and RL should be ideally twisted shielded, with the shield tied to GND
Note : For 2V direct input use 10k matched resistors for Ri & Rf.
FIGURE 8A. DIFFERENTIAL RESOLVER INPUT
at the con verter.
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
Note: The five external BW components as
shown in FIGURE 1 and 2 are necessary
for the R/D to function.
S1 and S3, S2 and S4, and RH and RL should be ideally twisted shielded, with the shield tied to GNDat the converter. For DDC-49530
or DDC-57470: Ri = 70.8 k, 11.8 V input, synchro or resolver. For DDC-49590: Ri = 270 k, 90 V input, synchro or resolver. Maximum
addition error is 1 minute using recommended thin film pac kage.
Note on DC Offset Gains: Input options affect DC offset gains and theref ore affect carrier frequency r ipple and jitter. Offsets gains
associated with differential mode, (offset gain for differential configuration = 1 + RF/RI) and direct mode (offset gain f or direct config-
uration = 1), sho w differential will alw ays be higher . Higher DC offsets cause higher carr ier frequency r ipple due to demodulati on
process. This carrier frequency ripple because it is r iding on the top of the DC error signal causes jitter . A higher carrier frequency vs
bandwidth ratio will help decrease r ipple and jitter associated with offsets . Summary: R/D’s with differential inputs are more su scepti-
ble to offset problems than R/D’s in single ended mode. RD’s in higher resolutions, such as 16 bit, will further compound offset issues
due to higher inter nal voltage gains. Although the differential configuration has a higher DC offset gain, the diff erential configuration’s
common mode noise rejection mak es it the pref erred input option. The tradeoffs should be considered on a design to design basis .
Also refer to FAQ-GIQ-021.
FIGURE 8B. DIFFERENTIAL RESOLVER INPUT, USING DDC-49530, DDC-57470 (11.8 V),
DDC-73089 (2V), OR DDC-49590 (90 V)
Data Device Corporation
www.ddc-web.com
11
RDC-19220 SERIES
R-12/05-0

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