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| 型号： | EVAL-AD2S1210EDZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 27/36页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL AD2S1210 |
| 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： | AD2S1210 |
| 主要属性： | 10 ~ 16 位分辨率，3125 rps 最大（10 位）或 1024 脉冲 |
| 次要属性： | 图形用户界面 |
| 已供物品： | 板，CD |
| 产品目录页面： | 788 (CN2011-ZH PDF) |
| 相关产品： | AD2S1210CSTZ-ND - IC CONV R/D VAR RES OSC 48-LQFP AD2S1210BSTZ-ND - IC CONV R/D 10-16BIT 48-LQFP AD2S1210ASTZ-ND - IC CONV R/D 10-16BIT 48-LQFP |
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AD2S1210
Rev. A | Page 33 of 36
Table 29. Loop Transfer Function Parameters vs. Resolution
(fCLKIN = 8.192 MHz)
Resolution (Bits)
t1 (ms)
t2 (ms)
Ka (sec2)
10
0.4
42
39.6 × 106
12
1
91
6.5 × 106
14
2
160
1.6 × 106
16
8
728
92.7 × 103
Note that the closed-loop response is described as
)
(
1
)
(
)
(
s
G
s
G
s
H
+
=
(17)
By converting the calculation to the s-domain, it is possible to
quantify the open-loop dc gain (Ka). This value is useful to
calculate the acceleration error of the loop (see the Sources of
Error section).
The step response to a 10° input step is shown in Figure 10,
Figure 11, Figure 12, and Figure 13. The step response to a 179°
Figure 17. In response to a step change in velocity, the
AD2S1210 exhibits the same response characteristics as it does
for a step change in position.
section show the magnitude and phase responses of the AD2S1210
for each resolution setting.
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 =
(18)
Conversely,
a
K
on
Accelerati
Input
Error
Tracking
=
(19)
The units of the numerator and denominator must be consistent.
The maximum acceleration of the AD2S1210 is defined by the
maximum acceptable tracking error in the users application.
For example, if the maximum acceptable tracking error is 5°,
then the maximum acceleration is defined as the acceleration that
creates an output position error of 5° (that is, when LOT is
indicated).
An example of how to calculate the maximum acceleration in a
12-bit application with a maximum tracking error of 5° is
°
×
=
)
/rev
(
360
5
)
(sec
2
a
K
on
Accelerati
Maximum
90,300 rps2
(20)
section show the tracking error vs. acceleration response of the
AD2S1210 for each resolution setting.
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