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參數(shù)資料
| 型號： | AD2S1200 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 12-Bit R/D Converter with Reference Oscillator |
| 中文描述： | 12位的R / D轉換器與參考振蕩器 |
| 文件頁數(shù)： | 18/24頁 |
| 文件大?。?/td> | 390K |
| 代理商： | AD2S1200 |
AD2S1200
CIRCUIT DYNAMICS
AD2S1200 LOOP RESPONSE MODEL
Rev. 0 | Page 18 of 24
0
ERROR
(ACCELERATION)
–
θ
IN
θ
OUT
VELOCITY
k1
×
k2
1–z
–1
1–bz
–1
1–z
–1
c
1–az
–1
c
Sin/Cos LOOKUP
Figure 11. RDC System Response Block Diagram
The RDC is a mixed-signal device, which uses two A/D
converters to digitize signals from the resolver and a Type II
tracking loop to convert these to digital position and velocity
words.
The first gain stage consists of the ADC gain on the Sin/Cos
inputs, and the gain of the error signal into the first integrator.
The first integrator generates a signal proportional to velocity.
The compensation filter contains a pole and a zero, used to
provide phase margin and reduce high frequency noise gain.
The second integrator is the same as the first integrator and
generates the output position from the velocity signal. The
Sin/Cos lookup has unity gain. Values are given below for each
section:
ADC gain parameter
(k1
nom
= 1.8/2.5)
)
(
)
(
1
V
V
V
V
k
REF
p
IN
=
Error gain parameter
π
×
=
2
10
18
2
6
x
k
Compensator zero coefficient
4096
4095
=
a
Compensator pole coefficient
4096
4085
=
b
Integrator gain parameter
4096000
1
=
c
INT1 and INT2 transfer function
1
1
)
(
=
z
c
z
I
Compensation filter transfer
function
1
1
1
1
)
(
=
bz
az
z
C
R2D open-loop transfer function
)
(
)
(
2
1
)
(
2
z
C
z
I
k
k
z
G
×
×
×
=
R2D closed-loop transfer function
)
(
1
)
z
(
G
)
(
z
G
+
z
H
=
The closed-loop magnitude and phase responses are that of a
second-order low-pass filter (see Figure 12 and Figure 13).
To convert G(z) into the s-plane, we perform an inverse bilinear
transformation by substituting for
z,
where
T
= the sampling
period (1/4.096 MHz
≈
244 ns).
s
T
s
T
z
+
=
2
2
Substitution yields the open-loop transfer function G(s).
)
1
)
1
T
1
)
1
)
1
T
1
4
1
)
1
a
1
)
(
2
2
2
b
b
s
a
a
s
s
T
s
sT
b
a
k
k
s
G
+
×
+
+
×
+
×
+
+
×
×
=
This transformation produces the best matching at low
frequencies (f << f
SAMPLE
). At lower frequencies (within the
closed-loop bandwidth of the AD2S1200), the transfer function
can be simplified to
2
1
2
1
1
)
(
st
st
s
K
s
G
a
+
+
×
where:
b
a
a
k
k
K
b
b
T
1
t
a
a
T
1
t
a
×
=
+
=
+
=
)
1
1
)
)
1
)
)
1
2
1
Solving for each value gives t
1
= 1 μs, t
2
= 90 μs, and K
a
≈
7.4 ×
10
6
s
2
. Note that the closed-loop response is described as
)
(
1
)
(
G
)
(
s
s
G
+
s
H
=
By converting to the s-domain, we are able to quantify the
open-loop dc gain (K
a
). This value is useful during calculation
of acceleration error of the loop as discussed in the Sources of
Error
section.
The step response to a 10° input step is shown in Figure 14.
Because the error calculation (Equation 3) is nonlinear for large
values of θ
, the response time for larger step changes in
position (90°
–
180°) will typically take three times as long as the
response to a small step change in position (<20°). In response
to a step change in velocity, the AD2S1200 will exhibit the same
response characteristics as for a step change in position.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AD2S1200WST | 制造商:Analog Devices 功能描述:Resolver to Digital 12-Bit Parallel/Serial (3-Wire, SPI) 制造商:Analog Devices 功能描述:IC 12BIT ADC REF OSC SMD 2S1200 |
| AD2S1200WSTZ | 功能描述:IC R/D CONV W/REF OSCIL 44-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:50 系列:- 類型:數(shù)據(jù)采集系統(tǒng)（DAS） 分辨率（位）:16 b 采樣率（每秒）:21.94k 數(shù)據(jù)接口:MICROWIRE?，QSPI?，串行，SPI? 電壓電源:模擬和數(shù)字 電源電壓:1.8 V ~ 3.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應商設備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
| AD2S1200WSTZSTZ | 制造商:Analog Devices 功能描述:ANAAD2S1200WSTZ |
| AD2S1200YST | 制造商:Analog Devices 功能描述:Resolver to Digital 12-Bit Parallel/Serial (3-Wire, SPI) 制造商:Rochester Electronics LLC 功能描述:12-BIT R/D CONVERTER W/REF OSCILLATOR - Bulk 制造商:Analog Devices 功能描述:IC 12BIT ADC REF OSC SMD 2S1200 |
| AD2S1200YSTZ | 功能描述:IC CONV R/D 12-BIT W/OSC 44-LQFP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產品培訓模塊:Data Converter Basics 標準包裝:1 系列:- 類型:電機控制 分辨率（位）:12 b 采樣率（每秒）:1M 數(shù)據(jù)接口:串行，并聯(lián) 電壓電源:單電源 電源電壓:2.7 V ~ 3.6 V，4.5 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:100-TQFP 供應商設備封裝:100-TQFP（14x14） 包裝:剪切帶 (CT) 其它名稱:296-18373-1 |
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