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參數(shù)資料
| 型號： | AD2S81AJD |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 位置變換器 |
| 英文描述： | Variable Resolution, Monolithic Resolver-to-Digital Converters |
| 中文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, CDIP28 |
| 封裝： | CERAMIC, DIP-28 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 207K |
| 代理商： | AD2S81AJD |
AD2S81A/AD2S82A
REV. B
–13–
The small signal step response is shown in Figure 8. The time
from the step to the first peak is t
1
and the t
2
is the time from
the step until the converter is settled to 1 LSB. The times t
1
and
t
2
are given approximately by
t
1
=
1
f
BW
t
2
=
5
f
BW
×
R
12
where
R
= resolution, i.e., 10, 12, 14 or 16.
TIME
OUTPUT
POSITION
t
1
t
2
Figure 8. AD2S81A/AD2S82A Small Step Response
The large signal step response (for steps greater than 5 degrees)
applies when the error voltage exceeds the linear range of the
converter.
Typically the converter will take three times longer to reach the
first peak for a 179 degrees step.
In response to a velocity step, the velocity output will exhibit
the same time response characteristics as outlined above for the
position output.
ACCELERATION ERROR
A tracking converter employing a type 2 servo loop does not
suffer any velocity lag, however, there is an additional error due
to acceleration. This additional error can be defined using the
acceleration constant
K
A
of the converter.
K
A
=
Input Acceleration
Error inOutput Angle
The numerator and denominator must have consistent angular
units. For example, if K
A
is in sec
–2
, then the input acceleration
may be specified in degrees/sec
2
and the error output in degrees.
Angular measurement may also be specified using radians, min-
utes of arc, LSBs, etc.
K
A
does not define maximum input acceleration,
only the error due
to it’s acceleration. The maximum acceleration allowable before
the converter loses track is dependent on the angular accuracy
requirements of the system.
Angular Accuracy
×
K
A
=
degrees
/
sec
2
K
A
can be used to predict the output position error for a given
input acceleration. For example for an acceleration of 100 revs/
sec
2
, K
A
= 2.7
×
10
6
sec
–2
and 12-bit resolution.
To determine the value of
K
A
based on the passive components
used to define the dynamics of the converter, the following
should be used:
K
A
=
4.04
×
10
11
2
n
R
6
R
4
(
C
4
+
C
5)
Where
n
= resolution of the converter
R
4,
R
6 in ohms
C
5,
C
4 in farads
SOURCES OF ERRORS
Integrator Offset
Additional inaccuracies in the conversion of the resolver signals
will result from an offset at the input to the integrator as it will
be treated as an error signal. This error will typically be 1 arc
minute over the operating temperature range.
A description of how to adjust from zero offset is given in the
Component Selection section and the circuit required is shown
in Figures 1a and 1b.
Differential Phase Shift
Phase shift between the sine and cosine signals from the resolver
is known as differential phase shift and can cause static error.
Some differential phase shift will be present on all resolvers as a
result of coupling. A small resolver residual voltage (quadrature
voltage) indicates a small differential phase shift. Additional
phase shift can be introduced if the sine channel wires and the
cosine channel wires are treated differently. For instance, differ-
ent cable lengths or different loads could cause differential
phase shift.
The additional error caused by differential phase shift on the
input signals approximates to
Error = 0.53 a
×
b arc minutes
where a = differential phase shift (degrees).
b = signal to reference phase shift (degrees).
This error can be minimized by choosing a resolver with a small
residual voltage, ensuring that the sine and cosine signals are
handled identically and removing the reference phase shift (see
Connecting the Resolver section). By taking these precautions
the extra error can be made insignificant.
Under static operating conditions phase shift between the refer-
ence and the signal lines alone will not theoretically affect the
converter’s static accuracy.
However, most resolvers exhibit a phase shift between the signal
and the reference. This phase shift will give rise under dynamic
conditions to an additional error defined by:
Shaft Speed
(
rps
)
×
Phase Shift
(
Degrees
)
Reference Frequency
Error in LSBs
Input Acceleration LSB
K
rev
[
2 7 10
LSBsor
of arc
A
=
=
×
=
[
2
/
]
[
]
/
]
.
.
.
–
sec
sec
sec
seconds
2
12
6
100
2
0 15
47 5
2
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD2S82 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Variable Resolution, Monolithic Resolver-to-Digital Converters |
| AD2S82A | 制造商:AD 制造商全稱:Analog Devices 功能描述:Variable Resolution, Monolithic Resolver-to-Digital Converters |
| AD2S82AHP | 功能描述:IC R/D CONV TRACKING 44PLCC RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
| AD2S82AHP | 制造商:Analog Devices 功能描述:IC R/D CONVERTER. 2S82 |
| AD2S82AHP-REEL | 功能描述:IC CONV R/D MONO VAR RES 44PLCC RoHS:否 類別:集成電路 (IC) >> 接口 - 傳感器和探測器接口 系列:- 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 類型:觸控式傳感器 輸入類型:數(shù)字 輸出類型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 |
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