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參數(shù)資料
| 型號(hào)： | AD2S83IP |
| 廠商： | ANALOG DEVICES INC |
| 元件分類(lèi)： | 位置變換器 |
| 英文描述： | Variable Resolution, Resolver-to-Digital Converter |
| 中文描述： | SYNCHRO OR RESOLVER TO DIGITAL CONVERTER, PQCC44 |
| 封裝： | PLASTIC, LCC-44 |
| 文件頁(yè)數(shù)： | 13/19頁(yè) |
| 文件大?。?/td> | 176K |
| 代理商： | AD2S83IP |
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AD2S83
–13–
REV. D
During the VCO reset period the input continues to be inte-
grated. The reset period is constant at 40 ns.
The VCO rate is fixed for a given input current by the VCO
scaling factor:
= 8.5
kHz
/
μ
A
The tracking rate in rps per
μ
A of VCO input current can be
found by dividing the VCO scaling factor by the number of LSB
changes per rev (i.e., 4096 for 12-bit resolution).
The input resistor R6 determines the scaling between the con-
verter velocity signal voltage at the INTEGRATOR OUTPUT
pin and the VCO input current. Thus to achieve a 5 V output at
100 rps (6000 rpm
)
and 12-bit resolution the VCO input cur-
rent must be:
(100
×
4096)/(8500)
=
48.2
μ
A
Thus, R6 would be set to: 5/(48.2
×
10
–6
) =
103.7 k
The velocity offset voltage depends on the VCO input resistor,
R6, and the VCO bias current and is given by
Velocity Offset Voltage = R
6
×
(
VCO bias current)
The temperature coefficient of this offset is given by
Velocity Offset Tempco =
R6
×
(
VCO
bias current tempco)
where the VCO bias current tempco is typically +0.22 nA/
°
C.
The maximum recommended rate for the VCO is 1.1 MHz
which sets the maximum possible tracking rate.
Since the minimum voltage swing available at the integrator
output is
±
8 V, this implies that the minimum value for R6 is
62 k
. As
Max Current
=
1.1
×
10
6
8.5
×
10
3
=
129
μ
A
8
129
×
10
–6
=
62
k
MinValue R
6
Transfer Function
By selecting components using the method outlined in the sec-
tion “Component Selection,” the converter will have a critically
damped time response and maximum phase margin. The
Closed-Loop Transfer Function is given by:
θ
OUT
θ
IN
(
s
N
+
2.4)(
s
N
=
14(1
+
s
N
)
2
+
3.4
s
N
+
5.8)
where, s
N
, the normalized frequency variable is given by:
s
N
=
2
π
s
f
BW
and
f
BW
is the closed-loop 3 dB bandwidth (selected by the
choice of external components).
The acceleration constant K
A
,
is given approximately by
K
A
=
6
×
(
f
BW
)
2
sec
–2
The normalized gain and phase diagrams are given in Figures 5
and 6.
FREQUENCY – f
BW
12
–12
G
9
0
–3
–6
–9
6
3
0.0
2
0.04
0.1
0.2
0.4
1
Figure 5. Gain Plot
FREQUENCY – f
BW
180
–180
P
135
0
–45
–90
–135
90
45
0.0
2
0.04
0.1
0.2
0.4
1
Figure 6. Phase Plot
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|---|---|
| AD2S83IP-REEL | 制造商:Analog Devices 功能描述:Resolver to Digital 16-Bit Parallel 制造商:Rochester Electronics LLC 功能描述:8 ARC MIN 44PLCC -40/85C - Tape and Reel |
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| AD2S83IPZ-REEL | 功能描述:IC CONV R/D MONO VAR RES 44PLCC RoHS:是 類(lèi)別:集成電路 (IC) >> 接口 - 傳感器和探測(cè)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(lèi)型:觸控式傳感器 輸入類(lèi)型:數(shù)字 輸出類(lèi)型:數(shù)字 接口:JTAG，串行 電流 - 電源:100µA 安裝類(lèi)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 |
| AD2S90 | 制造商:AD 制造商全稱(chēng):Analog Devices 功能描述:Low Cost, Complete 12-Bit Resolver-to-Digital Converter |
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