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DTC-19300 데이터시트 PDF




Data Device에서 제조한 전자 부품 DTC-19300은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 DTC-19300 기능
기능 LVDT / RVDT to Digital Converter
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DTC-19300 데이터시트, 핀배열, 회로
www.DataSheet4U.com
DTC-19300
LVDT/RVDT-TO-DIGITAL CONVERTER
Make sure the next
Card you purchase
has...
®
FEATURES
Internal Oscillator:
Programmable for Voltage and
Frequency
Programmable Signal Gain
Programmable for 12- or14-Bit
Resolution
Velocity Output
Built-In-Test Output
Three-State, Two-Byte Digital Output
DESCRIPTION
The DTC-19300 is a 12- or 14-bit LVDT (Linear Variable Differential
Transformer)- or RVDT (Rotary Variable Differential Transformer)-to- digital
converter which also supplies the AC excitation to drive the LVDT. Internal AC
excitation voltage, frequency, signal gain and resolution are all programma-
ble for optimum system performance. Packaged in a 36-pin hybrid, the DTC-
19300 also features Velocity (VEL) and Built-In-Test (BIT) outputs. The three-
state digital outputs are provided in a two byte format, for easy computer
interface.
The DTC-19300 has been designed precisely for use with an LVDT. Inherent
characteristics of the DTC-19300, such as the input to output phase shift,
have been given considerable attention. The converter’s reference voltage is
derived from, and is in phase with, the LVDT output signal. Therefore, any
errors due to the transducer’s phase shift are virtually eliminated. Additionally,
the programmability of the DTC-19300 will accomodate a broad range of
LVDT’s.
APPLICATIONS
The DTC-19300 provides many features previously supplied by individual
system components. Because of its internal AC source, programmable fea-
tures, fault indicator (BIT), and velocity output (VEL), the need for other sys-
tem circuits is minimized. The DTC-19300 is an excellent choice for applica-
tions using the LVDT transducer for position feedback, such as military, com-
mercial aerospace and industrial control systems.
www.DataSheet4U.com
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
All trademarks are the property of their respective owners.
© 1998, 1999 Data Device Corporation




DTC-19300 pdf, 반도체, 판매, 대치품
www.DataSheet4U.com
TABLE 1. DTC-19300 SPECIFICATIONS (CONT.)
Specifications apply over temperature and power supply ranges
PARAMETER
DYNAMIC
CHARACTERISTICS
Tracking Rate
Bandwidth, Closed Loop
Ka
A1
A2
A
B
Acc for 1 LSB lag
Setting Time - half scale
step
VALUE
1 full range per sec, min
18 Hz
1600 1/sec2
0.4 1/sec
4000 1/sec
40 1/sec
20 1/sec
0.1 full ranges per sec2
150ms
DESCRIPTION
POWER SUPPLIES
+5V SUPPLY
+5 VDC ± 10%
Nominal Voltage and Range +8 VDC
Max Voltage w/o Damage 10 mA max
Current, Peak
10 mA max
Current, Average
+15V SUPPLY
Nominal Voltage and Range +15 VDC ±5%
Max Voltage w/o Damage +18 VDC
Current Peak
25 mA max, +2 x Iosc rms.
Current, Average
35 mA max, + 0.9 x 0.5 x Iosc rms
TEMPERATURE RANGES
Operating, Ambient
-3XX
-1XX
Storage
0°C to +70°C
-55°C to +125°C
-65°C to +150°C
PHYSICAL
CHARACTERISTICS
Size
Weight
0.78 x 1.9 x 0.21 inches
(20 x 48 x 5.3 mm)
1 oz
(28 gm)
36-pin DDIP
INTRODUCTION
The circuit shown in FIGURE 1 (DTC-19300 Block Diagram)
consists of four main parts:
1. Signal input conditioner
2. Feedback loop (whose elements include a high accuracy ratio
bridge, a demodulator, an error processor, a VCO and an up-
down counter)
3. Power oscillator to excite the LVDT
4. Digital interface circuit (including various latches and buffers)
In the LVDT, position output is transmitted as a differential volt-
age that varies linearly with changes in the core position. The
DTC-19300 receives the differential and sum voltage at its inputs
and internally produces a digital position δ which tracks the dif-
ferential position λ to within the specified accuracy of the con-
verter.
A high accuracy ratio bridge is used to compute (λ - δ), where:
λ
δ
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= the digital position contained in the
converter’s
up-down
counter.
The tracking process consists of continually adjusting δ to make
(λ - δ) 0, so that δ will represent the core’s position, λ.
The ratio bridge output is fed to a demodulator whose output is
an analog DC level proportional to (λ - δ). The error processor
receives its input from the demodulator and integrates the error
signal (λ - δ) which then drives a Voltage-Controlled Oscillator
(VCO).
Functionally, the up-down counter is an incremental integrator.
Therefore, there are two stages of integration which make the
converter a type II tracking servo. In a type II servo the VCO
always settles to the counting rate which makes the dδ/dt equal
to dλ/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.
Data Device Corporation
www.ddc-web.com
4
DTC-19300
J-06/05-0

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DTC-19300 전자부품, 판매, 대치품
www.DataSheet4U.com
INTERNAL OSCILLATOR
1. Select the LVDT’s operating frequency.
converter with the 2-wire LVDTs.
2. Calculate the value of R4 (the oscillator frequency setting
resistor) by using the LVDT frequency in the equation below.
R4 (in Ohms) = (Fre1q.u1e4nxcy10in12Hz)2- 45.6k
3. Calculate the value of R3 (the oscillator amplitude setting
resistor), to result in 0.8 Vrms between pin 32 (R) and pin 25 (V),
when the LVDT is at its null position (core in the center). This
usually requires a 0.8 Vrms input to the LVDT primary. Proceed
as follows:
a. Use the LVDT turns ratio (usually 1:1) to calculate the
oscillator output with the following equation:
Vosc = 0.8 volts x turns ratio
b. Calculate the value of R3 with the equation below:
R3
=
Vosc
2.7
x 100k
- Vosc
c. Calculate the value of the coupling capacitor C1 so that its
impedance will be less than 1/10 the impedance of the
LVDT at the operating frequency.
CONVERTER FULL SCALE
4. Calculate the value of R2 (full-scale setting resistor) with the
LVDT at full travel. This results in 1.6 Vrms between pin 35 (SO)
and pin 25 (V). Use the following equation:
R2
=
10k
1.6
x
-
pin
pin
33
33
(S)
(S)
voltage
voltage
PHASE COMPENSATION
5. At full travel, monitor pin 24 (e) voltage with an oscilloscope
and determine the value for C2 that gives minimum output. This
value (of C2) can be used for all applications which use the same
LVDT.
CONVERTER RESOLUTION
6. Select 12-bit or 14-bit operating mode. The 12-bit mode pro-
vides faster response to input variations and is set by grounding
pin 23 (A). The 14-bit mode provides higher resolution and is set
by connecting pin 18 (BIT output) to pin 23 (A).
In both modes, if the BIT line goes low indicating an error condi-
tion (the error signal to error processor and VCO is too large), the
DTC-19300 is set to 12-bit mode so that the error can be driven
to null faster. Once this happens, the converter returns to the
origwinwal wse.ttDinga.taSheet4U.com
Note: Consult factory for information concerning the use of the
PHASE
COMP
TO V
(PIN 25)
FULL
SCALE
R2
C2
R5
10k
10k
R1
SJ
29
SO
35
SG
34
S
33
e
24
TO V
(PIN 25)
R 32
DTC-193000
LVDT
V 25
RO
31
C1
+
RI 36
OSC
19
RF1
21
FREQ
R4
RF2
22
AMPL
R3
20
RM
23
18
A
BIT
FIGURE 7. DTC-19300 SET-UP
TABLE 3. BIT WEIGHTS
BIT WEIGHT
1 (MSB)
2
3
4
5
6
7
8
9
10
11
12
13
14 (LSB)
0.5 full range = FS
0.25 full range = HS
0.125 full range
0.0625 full range
0.03125 full range
0.015625 full range
0.0078125 full range
0.0039063 full range
0.0019531 full range
0.0009766 full range
0.0004883 full range
0.0002441 full range
0.0001221 full range
0.0000610 full range
Data Device Corporation
www.ddc-web.com
7
DTC-19300
J-06/05-0

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