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参数资料
| 型号： | RDC-19220-433Z |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 位置变换器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, CDIP40 |
| 封装： | CERAMIC, DDIP-40 |
| 文件页数： | 5/22页 |
| 文件大小： | 304K |
| 代理商： | RDC-19220-433Z |
13
Data Device Corporation
www.ddc-web.com
RDC-19220 SERIES
N-09/03-0
+S
-S
SIN
aR
R
+C
-C
COS
R
-
+
-
+
R
aR
C1
bR
2R
R
bR
+REF
-REF
R
C2
2 WIRE LVDT
REF IN
R
2 V
FS = 2 V
FIGURE 12A. 2-WIRE LVDT DIRECT INPUT
TABLE 7. LVDT OUTPUT CODE (14-BIT R/D OR
12-BIT LVDT)
LVDT OUTPUT
MSB
LSB
+ 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
C1 = C2, set for phase lag = phase lead through the LVDT.
Note: TABLE 7 refers to FIGURE 12C.
Magnitude of Error = (Quadrature Voltage/F.S.signal) tan
α
Where:
Magnitude of Error is in radians
Quadrature Voltage is in volts
Full Scale signal is in volts
α = signal to REF phase shift
An example of the magnitude of error is as follows:
Let: Quadrature Voltage = 11.8 mV
Let: F.S. signal = 11.8 V
Let:
α = 6°
Then: Magnitude of Error = 0.36 min @ 1 LSB in the 16th bit.
Note: Quadrature is composed of static quadrature which is
specified by the synchro or resolver supplier plus the speed
voltage which is determined by the following formula:
Speed Voltage = (rotational speed/carrier frequency) F.S. signal
Where:
Speed Voltage is the quadrature due to rotation.
Rotation speed is the rps (rotations per second) of the synchro
or resolver.
Carrier frequency is the REF in Hz.
FIGURE 11 illustrates a circuit to LEAD or LAG the reference
into the converter that will compensate for phase-shift between
the signal and the reference to reduce the effects of the quadra-
ture.
LVDT MODE
As shown in TABLE 1 the RDC-19220 Series units can be made
to operate as LVDT-to-digital converters by connecting
Resolution Control inputs A and B to “0,” “1,” or the -5 volt supply.
In this mode the RDC-19220 Series 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
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