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參數(shù)資料
| 型號： | AD2S82A |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Variable Resolution, Monolithic Resolver-to-Digital Converters(可變分辨率,單片解算-數(shù)字變換器) |
| 中文描述： | 可變分辨率，單片分解到數(shù)字轉(zhuǎn)換器（可變分辨率，單片解算-數(shù)字變換器） |
| 文件頁數(shù)： | 8/16頁 |
| 文件大?。?/td> | 195K |
| 代理商： | AD2S82A |
REV. B
–8–
AD2S81A/AD2S82A
COMPONENT SELECTION
The following instructions describe how to select the external
components for the converter in order to achieve the required
bandwidth and tracking rate. In all cases the nearest “preferred
value’’ component should be used and a 5% tolerance will not
degrade the overall performance of the converter. Care should
be taken that the resistors and capacitors will function over the
required operating temperature range. The components should
be connected as shown in Figure 1.
PC compatible software is available to help users select the optimum
component values for the AD2S81A and AD2S82A, and display the
transfer gain, phase and small step response.
For more detailed information and explanation, see the Circuit
Functions and Dynamic Performance section.
1. HF Filter (R1, R2, C1, C2)
The function of the HF filter is to remove any dc offset and
to reduce the amount of noise present on the signal inputs
to the AD2S81A/AD2S82A, reaching the Phase Sensitive
Detector and affecting the outputs. R1 and C2 may be omit-
ted—in which case R2 = R3 and C1 = C3, calculated below—
but their use is particularly recommended if noise from
switch mode power supplies and brushless motor drive is
present.
Values should be chosen so that
15
k
≤
R
1
=
R
2
≤
56
k
C
1
=
C
2
1
2
π
R
1
f
REF
and
f
REF
= Reference Frequency
(Hz)
This filter gives an attenuation of three times at the input to
the phase sensitive detector.
2. Gain Scaling Resistor (R4)
If R1, C2 are fitted, then:
R
4
=
E
DC
100
×
10
9
×
1
3
where 100
×
10
–9
= current/LSB
If R1, C2 are not fitted, then:
R
4
=
E
DC
100
×
10
–9
where
E
DC
= 160
×
10
–3
for 10 bits resolution
= 40
×
10
–3
for 12 bits
= 10
×
10
–3
for 14 bits
= 2.5
×
10
–3
for 16 bits
= Scaling of the DC ERROR in volts
3. AC Coupling of Reference Input (R3, C3)
Select R3 and C3 so that there is no significant phase shift at
the reference frequency. That is,
R
3
=
100
k
C
3
>
1
R
3
×
f
REF
F
with
R
3 in
.
4. Maximum Tracking Rate (R6)
The VCO input resistor R6 sets the maximum tracking rate
of the converter, and hence the velocity scaling as at the max
tracking rate, the velocity output will be 8 V.
Decide on your maximum tracking rate, “T,” in revolutions
per second. Note that “T” must not exceed the maximum
tracking rate or 1/16 of the reference frequency.
R
6
=
6.32
×
10
10
T
×
n
where
n
= bits per revolution
= 1,024 for 10 bits resolution
= 4,096 for 12 bits
= 16,384 for 14 bits
= 65,536 for 16 bits
5. Closed-Loop Bandwidth Selection (C4, C5, R5)
a. Choose the closed-loop bandwidth (f
BW
) required
ensuring that the ratio of reference frequency to band-
width does exceed the following guidelines:
Resolution
Ratio of Reference Frequency/Bandwidth
10
12
14
16
7.5 : 1
Typical values may be 100 Hz for a 400 Hz reference fre-
quency and 500 Hz to 1000 Hz for a 5 kHz reference
frequency.
b. Select C4 so that
2.5 : 1
4
6
: 1
: 1
C
4
=
21
R
6
×
f
BW
2
F
with
R
6 in
and
f
BW
, in Hz selected above.
c. C5 is given by
C
5
=
5
×
C
4
F
d. R5 is given by
R
5
=
4
2
× π ×
f
BW
×
C
5
6. VCO Phase Compensation
The following values of C6 and R7 should be fitted.
C
6
=
470
pF
,
R
7
=
68
7. Offset Adjust
Offsets and bias currents at the integrator input can cause an
additional positional offset at the output of the converter of
1 arc minute typical, 5.3 arc minutes maximum. If this can be
tolerated, then R8 and R9 can be omitted from the circuit.
If fitted, the following values of R8 and R9 should be used:
R
8
=
4.7
M
,
R
9
=
1
M
potentiometer
To adjust the zero offset, ensure the resolver is disconnected
and all the external components are fitted. Connect the COS
pin to the REFERENCE I/P and the SIN pin to the SIGNAL
GND and with the power and reference applied, adjust the
potentiometer to give all “0s” on the digital output bits.
The potentiometer may be replaced with select on test resistors
if preferred.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AD2S82AJP | Circular Connector; No. of Contacts:16; Series:MS27473; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:20; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:20-16 RoHS Compliant: No |
| AD2S82AHP | Variable Resolution, Monolithic Resolver-to-Digital Converters |
| AD2S81 | Variable Resolution, Monolithic Resolver-to-Digital Converters |
| AD2S81AJD | Variable Resolution, Monolithic Resolver-to-Digital Converters |
| AD2S82 | Variable Resolution, Monolithic Resolver-to-Digital Converters |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 標準包裝: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 標準包裝: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 |
| AD2S82AHPZ | 功能描述:IC R/D CONV TRACKING 44PLCC RoHS:是 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 標準包裝: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 |
| AD2S82AHPZ-REEL | 功能描述:IC CONV R/D MONO VAR RES 44PLCC RoHS:是 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 標準包裝: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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