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參數(shù)資料
| 型號(hào)： | AD2S44-TM12B |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 12/12頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CONV SYNC/R-D 14BIT 2CH 32DIP |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 類型： | R/D 轉(zhuǎn)換器 |
| 分辨率（位）： | 14 b |
| 數(shù)據(jù)接口： | 并聯(lián) |
| 電壓電源： | 雙 ± |
| 電源電壓： | ±15V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 通孔 |
| 封裝/外殼： | 32-CDIP（0.900"，22.86mm） |
| 供應(yīng)商設(shè)備封裝： | 32-CDIP 底部銅焊 |
| 包裝： | 管件 |
| 其它名稱： | AD2S44TM12B AD2S44TM12B-ND |
Data Sheet
AD2S44
Rev. B | Page 9 of 12
SCALING FOR NONSTANDARD SIGNALS
A feature of these converters is that the signal and reference inputs
can be resistively scaled to accommodate nonstandard input signal
and reference voltages that are outside the nominal ±10% limits of
the converter. Using this technique, it is possible to use a standard
converter with a personality card in systems where a wide range
of input and reference voltages are encountered.
The accuracy of the converter is affected by the matching accu-
racies of resistors used for external scaling. For resolver format
options, it is critical that the value of the resistors on the S1 (A)/
S1 (B) to S3 (A)/S3 (B) signal input pair be precisely matched to
the S4 (A)/S4 (B) to S2 (A)/S2 (B) input pair. For synchro options,
the three resistors on the S1, S2, and S3 pins must be matched. In
general, a 0.1% mismatch between resistor values contributes an
additional 1.7 arc minutes of error to the conversion. In addition,
imbalances in resistor values can greatly reduce the common-
mode rejection ratio of the signal inputs.
To calculate the values of the external scaling resistors, add
2.222 k for each volt of signal in series with the S1, S2, S3, and
S4 pins (no resistor is required on the S4 pins for synchro options)
and add 3 k extra per volt of reference in series with the RLO
pins and the RHI pins.
DYNAMIC PERFORMANCE
θIN
θOUT
Ka
S2
1 + sT1
1 + sT2
02947-
006
Figure 6. Transfer Function of AD2S44
The transfer function of the converter is as follows:
Open-loop transfer function
2
1
a
IN
OUT
sT
s
K
+
×
=
θ
1
2
Closed-loop transfer function
a
2
a
1
IN
OUT
K
T
s
K
s
sT
3
2
1
+
=
θ
where:
Ka = 62000 sec–2.
T1 = 0.0061 sec.
T2 = 0.001 sec.
The gain and phase diagrams are shown in Figure 7 and Figure 8.
FREQUENCY (Hz)
G
AI
N
(
d
B)
6
3
0
–15
–12
–9
–6
–3
10
100
02947-
007
Figure 7. Gain Plot
FREQUENCY (Hz)
P
HAS
E
(
Deg
rees)
180
135
90
45
–180
–135
–90
–45
0
10
100
02947-
008
Figure 8. Phase Plot
ACCELERATION ERROR
A tracking converter employing a Type II servo loop does not
suffer any velocity lag. However, there is an additional error
due to acceleration. This error is defined using the acceleration
constant (Ka) of the converter
Ka = Input Acceleration/Error in Output Angle
The numerator and denominator must have consistent angular
units. For example, if Ka is expressed in sec–2, the input accelera-
tion is to be specified in degrees/sec2 and the output angle error is
to be specified in degrees. Alternatively, the angular unit of measure
can also be in units such as radians, arc minutes, or LSBs.
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| AD2S44-TM18B | 功能描述:IC CONV SYNC/R-D 14BIT 2CH 32DIP RoHS:是 類別:集成電路 (IC) >> 數(shù)據(jù)采集 - ADCs/DAC - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)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(yīng)商設(shè)備封裝:40-TQFN-EP（6x6） 包裝:托盤 |
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