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参数资料
| 型号： | RDC-19222S-172T |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 位置变换器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, CQCC44 |
| 文件页数： | 17/20页 |
| 文件大小： | 276K |
| 代理商： | RDC-19222S-172T |
6
Data Device Corporation
www.ddc-web.com
RDC-19220/2S
E-11/02-300
RC
7) RDC-19222 package only:
When using the built-in -5 V inverter: connect as shown.
The current drain from the +5 V supply doubles. No external -5 V
supply is needed. The power supply 47f caps shown may be
substituted with 10f caps if the P/S lines are clean (min noise).
When using the built-in -5 V inverter, the maximum tracking rate
should be scaled for a velocity output of 3.5 V max. Use the fol-
lowing equation to determine tracking rate used in the formula on
page 5:
Note: When using the highest BW and Tracking Rates, use of the
-5 V inverter is not recommended.
HIGHER TRACKING RATES AND
CARRIER FREQUENCIES
Tracking rate (nominally 4 V) is limited by two factors: velocity
voltage saturation and maximum internal clock rate (nominally
1,333,333 Hz). An understanding of their interaction is essential
to extending performance.
The General Setup Considerations section makes note of the
selection of Rv for the desired velocity scaling. Rv is the input
resistor to an inverting integrator with a 50 pF nominal feedback
capacitor. When it integrates to -1.25 V, the converter counts up
1 LSB and when it integrates to +1.25 V, the converter counts
down 1 LSB. When a count is taken, a charge is dumped on the
capacitor such that the voltage on it changes 1.25 V in a direc-
tion to bring it to 0 V. The output counts per second per volt input
is therefore:
TR (required) x (4.0) = Tracking rate used in calculation
(3.5)
TABLE 3. MAX TRACKING
RATE (MIN) IN RPS
RS
RESOLUTION
10
12
14
16
30k or open* 30 k 1152 288
72
18
Depending on the reso-
lution, select one of the
values from this row, for
use in converter max
tracking rate formula.
(See previous page for
formula.)
*The use of a high quality thin-film resistor will provide
better temperature stability than leaving open.
As an example:
Calculate Rv for the maximum counting rate, at a VEL voltage
of 4 V.
For a 12-bit converter there are 2
12 or 4096 counts per rotation.
1,333,333/4096 = 325 rotations per second or 333,333 counts
per second per volt.
The maximum rate capability of the RDC-19220/2S is set by RS.
When RS = 30 kHz it is nominally 1,333,333 counts/second,
which equates to 325 rps (rotations per second). This is the
absolute maximum; it is recommended to only run at < 90% of
this rate (as given in TABLE 3), therefore the minimum RV will be
limited to 55 kOhms.
1
R
V =
= 48k Ohms
(333,333 x 50 pF x 1.25)
1
(R
v x 50 pF x 1.25)
5
10
30 k
30k or open*
16
14
12
10
RESOLUTION
RS
RC
TABLE 4. CARRIER
FREQUENCY (MAX) IN KHZ
Carrier frequency is shown in TABLE 4.
RDC-19222
10f
23
25
+CAP
-CAP
.01uf
(-5c)
-5V
22
17
.01uf
(+5c) +5V
26
2
47uf
+
FIGURE 5. -5V BUILT-IN INVERTER
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