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| 型号： | RDC-19222-303Q |
| 厂商： | DATA DEVICE CORP |
| 元件分类： | 位置变换器 |
| 英文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, PQCC44 |
| 文件页数： | 21/24页 |
| 文件大小： | 256K |
| 代理商： | RDC-19222-303Q |
8) For RDC-19222:
This version is capable of +5V only operation. It accomplishes
this with a charge pump technique that inverts the +5V supply
for use as -5V, hence the +5V supply current doubles. The
built-in -5 V inverter can be used by connecting pin 2 to 26, pin
17 to 22, a 10 F/10 Vdc capacitor from pin 23 (negative ter-
minal) to pin 25 (positive terminal), and a 47 F/10 Vdc capac-
itor from -5 V to GND. The current drain from the +5 V supply
doubles. No external -5 V supply is needed.
When using the -5 V inverter, the max. tracking rate should be
scaled for a velocity output of 3.5 V max. Use the following equa-
tion to determine tracking rate used in the formula on page 4:
TR (required) x (4.0) = Tracking rate used in calculation
(3.5)
Note: When using the highest BW and Tracking Rates, using
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 resis-
tor to an inverting integrator with a 50 pF nominal feedback capac-
itor. 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 direction to bring
it to 0 V. The output counts per second per volt input is therefore:
1
(Rv x 50 pF x 1.25)
As an example:
Calculate Rv for the maximum counting rate, at a VEL voltage
of 4 V.
6
Data Device Corporation
www.ddc-web.com
RDC-19220 SERIES
L-11/02-300
For a 12-bit converter there are 212 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 is set by Rs.
When Rs = 30 k
it is nominally 1,333,333 counts/sec, which
equates to 325 rps (rotations per second). This is the absolute
maximum rate; it is recommended to only run at <90% of this rate
(as seen in TABLE 3), therefore the minimum Rv will be limited
to 55 k
. The converter maximum tracking rate can be increased
50% in the 16- and 14-bit modes and 100% in the 12- and 10-bit
modes by increasing the supply current from 12 to 15 mA (by
using an Rc = 23 k
), and by increasing the sampling rate by
changing Rs to 20 k
for 16- and 14-bit resolution or to 15 k for
12- and 10-bit resolution (see TABLE 4).
The maximum carrier frequency can, in the same way, increase
from: 5 to 10 kHz in the 16-bit mode, 7 to 14 kHz in the 14-bit
mode,11 to 32 kHz in the 12-bit mode, and 20 to 40 kHz in the
10-bit mode (see TABLE 5).
The maximum tracking rate and carrier frequency for full perfor-
mance are set by the power supply current control resistor (Rc)
per the following tables:
1
(333,333 x 50 pF x 1.25)
Rv =
= 48 k
7) Selecting a fBW that is too low relative to the maximum appli-
cation tracking rate can create a spin-around condition in
which the converter never settles. The relationship to insure
against spin-around is as follows (TABLE 3):
TABLE 3. TRACKING/BW RELATIONSHIP
RPS (MAX)/BW
RESOLUTION
1
10
0.45
12
0.25
14
0.125
16
TABLE 4. MAX TRACKING RATE
(MIN) IN RPS
RC
()
RS
()
RESOLUTION
10
12
14
16
30k** or open
30k
1152 288
72
18
23k
20k 1728 432 108
27
23k
15k 2304 576
*
10
*
14
32
24
40
34
15k
20k
23k
7
11
12
24
30k
23k
5
7
11
20
30k
30k** or open
16
14
12
10
RESOLUTION
RS
()
RC
()
TABLE 5. CARRIER FREQUENCY
(MAX) IN KHZ
Depending on the res-
olution, select one of
the values from this
row, for use in convert-
er max tracking rate
formula. (See previous
page for formula.)
* Not recommended.
** The use of a high quality thin-film resistor will provide better temperature
stability than leaving open.
* Not recommended.
** The use of a high quality thin-film resistor will provide better temperature
stability than leaving open.
The carrier frequency should be 1/10, or less, of the sampling fre-
quency in order to have many samples per carrier cycle. The con-
verter will work with reduced quadrature rejection at a carrier fre-
quency up to 1/4 the sampling frequency. Carrier frequency should
be at least 3.5 times the BW in order to eliminate the chance of jitter.
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相关代理商/技术参数 |
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| RDC-19222S-102T | 制造商:未知厂家 制造商全称:未知厂家 功能描述:LVDT/Resolver-to-Digital Converter |
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