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参数资料
| 型号： | EVAL-AD2S1205SDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR AD2S1205 |
| 标准包装： | 1 |
| 主要目的： | 接口，旋转变压至数字 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | AD2S1205 |
| 主要属性： | 12 位分辨率，最大 1250 rps 或 1024 脉冲/反向 |
| 已供物品： | 板 |
AD2S1205
Rev. A | Page 18 of 20
The step response to a 10° input step is shown in Figure 14.
Because the error calculation (see Equation 2) is nonlinear for
large values of θ , the response time for such large (90° to
180°) step changes in position typically takes three times as long
as the response to a small (<20°) step change in position. In
response to a step change in velocity, the AD2S1205 exhibits
the same response characteristics as it does for a step change
in position.
06
33
9-
0
12
1
5
0
–40
–35
–30
–25
–20
M
AG
NI
T
UD
E
(
d
B)
–15
–10
–5
–45
10
100
10k
1k
FREQUENCY (Hz)
100k
Figure 12. RDC System Magnitude Response
0
633
9-
0
13
1
0
–20
–180
–160
–140
–120
–100
P
H
AS
E
(
D
eg
re
es)
–80
–60
–40
–200
10
100
10k
1k
FREQUENCY (Hz)
100k
Figure 13. RDC System Phase Response
06
33
9-
0
14
0
20
18
2
4
6
8
10
ANG
L
E
(
D
eg
re
e
s
)
12
14
16
0
12
4
3
TIME (ms)
5
Figure 14. RDC Small Step Response
SOURCES OF ERROR
Acceleration
A tracking converter employing a Type II servo loop does not
have a lag in velocity. There is, however, an error associated
with acceleration. This error can be quantified using the
acceleration constant (Ka) of the converter.
Error
Tracking
on
Accelerati
Input
K
a =
(25)
Conversely,
a
K
on
Accelerati
Input
Error
Tracking
=
(26)
Figure 15 shows tracking error vs. acceleration for the AD2S1205.
The units of the numerator and denominator must be consistent.
The maximum acceleration of the AD2S1205 is defined as the
acceleration that creates an output position error of 5° (that is,
when LOT is indicated). The maximum acceleration can be
calculated as
2
rps
000
,
103
)
/rev
(
360
5
)
(sec
°
×
=
a
K
on
Accelerati
Maximum
(27)
06
33
9-
0
15
0
10
9
1
2
3
4
5
T
R
ACKI
NG
E
R
RO
R
(
D
eg
re
es)
6
7
8
0
40k
80k
160k
120k
ACCELERATION (rps2)
200k
Figure 15. Tracking Error vs. Acceleration
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