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参数资料
| 型号： | RD-19230FG-203 |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 位置变换器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, PQFP64 |
| 封装： | 0.520 X 0.520 INCH, GREEN, PLASTIC, QFP-64 |
| 文件页数： | 10/23页 |
| 文件大小： | 476K |
| 代理商： | RD-19230FG-203 |
18
Data Device Corporation
www.ddc-web.com
RD-19230
W-05/08-0
FIGURE 24. 2-WIRE LVDT DIRECT INPUT
LVDT MODE
As shown in TABLE 1, the RD-19230 unit can be made to oper-
ate as an LVDT-to-digital converter. In this mode the RD-19230
functions as a ratiometric tracking linear converter. When linear
AC inputs are applied from a LVDT the converter operates over
one quarter of its range. This results in two less bits of resolution
for LVDT mode than are provided in resolver mode.
LVDT output signals need to be scaled to be compatible with the
converter input. FIGURE 25 is a schematic of an input scaling
circuit applicable to 3-wire LVDTs. The value of the scaling con-
stant “a” is selected to provide an input of 2 Vrms at full stroke of
+S
-S
SIN
aR
R
+C
-C
COS
R
-
+
-
+
R
aR
C1
bR
2R
R
bR
+RH
-RL
R
C2
2 WIRE LVDT
REF IN
R
2 V
FS = 2 V
C1 = C2, set for phase lag = phase lead through the LVDT.
the LVDT. The value of scaling constant “b” is selected to provide
an input of 1 Vrms at null of the LVDT. Suggested components
for implementing the input scaling circuit are a quad op-amp,
such as a OP11 type, and precision thin-film resistors of 0.1%
tolerance. FIGURE 24 illustrates a 2-wire LVDT configuration.
Data output of the RD-19230 is Binary Coded in LVDT mode.
The most negative stroke of the LVDT is represented by ALL
ZEROS and the most positive stroke of the LVDT is represented
by ALL ONES. The most significant 2 bits (2 MSBs) may be used
as overrange indicators. Positive overrange is indicated by code
“01” and negative overrange is indicated by code “11“ (see
TABLE 9).
TABLE 9. 12-BIT LVDT OUTPUT CODE
FOR FIGURE 25
DATA
+ over full travel
+ full travel -1 LSB
+0.5 travel
+1 LSB
null
- 1 LSB
-0.5 travel
- full travel
- over full travel
01
xxxx
00
1111
00
1100
0000
00
1000
0000
0001
00
1000
0000
00
0111
1111
00
0100
0000
00
0000
11
xxxx
LVDT OUTPUT
MSB
LSB
OVER
RANGE
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| RD-19230FX-202 | 制造商:未知厂家 制造商全称:未知厂家 功能描述:Resolver-to-Digital Converter |
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