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AD2S1200YST Datasheet(PDF) 20 Page - Analog Devices

Part # AD2S1200YST
Description  12-Bit R/D Converter Reference Oscillator
PDF  25 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD2S1200YST Datasheet(HTML) 20 Page - Analog Devices

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AD2S1200
Rev. 0 | Page 19 of 24
1
5
–0
–40
–35
–30
–25
–20
–15
–10
–5
–45
10
100
10k
1k
FREQUENCY (Hz)
100k
Figure 12. RDC System Magnitude Response
1
0
–20
–180
–160
–140
–120
–100
–80
–60
–40
–200
10
100
10k
1k
FREQUENCY (Hz)
100k
Figure 13. RDC System Phase Response
0
20
18
2
4
6
8
10
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
suffer any velocity lag. 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 =
Conversely,
a
K
on
Accelerati
Input
Error
Tracking
=
Figure 15 shows tracking error versus acceleration for the
AD2S1200.
The numerator and denominator’s units must be consistent. The
maximum acceleration of the AD2S1200 has been defined as
the acceleration that creates an output position error of 5°
(when LOT is indicated). The maximum acceleration can be
calculated as
2
2
000
,
103
)
/
(
360
5
)
(sec
rps
rev
K
on
Accelerati
Maximum
a
≅
°
°
×
=
−
The AD2S1200 will be able to withstand the maximum
acceleration of 103,000 rps2 for approximately 10 ms before
reaching its maximum tracking rate of 1,000 rps.
ms
rps
rps
10
)
(
000
,
103
)
(
000
,
1
2
≅
0
10
9
1
2
3
4
5
6
7
8
0
40k
80k
160k
120k
ACCELERATION (rps2)
200k
Figure 15. Tracking Error vs. Acceleration



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