參數(shù)資料
型號: AD704AR-16-REEL
廠商: Analog Devices Inc
文件頁數(shù): 4/16頁
文件大?。?/td> 0K
描述: IC OPAMP GP QUAD PREC LN 16SOIC
標(biāo)準(zhǔn)包裝: 1,000
放大器類型: 通用
電路數(shù): 4
轉(zhuǎn)換速率: 0.15 V/µs
-3db帶寬: 800kHz
電流 - 輸入偏壓: 100pA
電壓 - 輸入偏移: 50µV
電流 - 電源: 1.5mA
電流 - 輸出 / 通道: 15mA
電壓 - 電源,單路/雙路(±): 4 V ~ 36 V,±2 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.295",7.50mm 寬)
供應(yīng)商設(shè)備封裝: 16-SOIC W
包裝: 帶卷 (TR)
AD704
Rev. E | Page 12 of 16
The 1 Hz, four-pole active filter offers dc precision with a
minimum of components and cost. The low current noise,
IOS, and IB allow the use of 1 MΩ resistors without sacrificing
the 1 μV/°C drift of the AD704. This means that lower capacitor
values can be used, reducing cost and space. Furthermore,
because the AD704’s IB is as low as its IOS, over most of the MIL
temperature range, most applications do not require the use of
the normal balancing resistor (with its stability capacitor).
Adding the optional balancing resistor enhances performance at
high temperatures, as shown in Figure 36. Table 5 gives
capacitor values for several common low pass responses.
180
120
60
0
–60
–120
–180
–40
0
40
80
120
TEMPERATURE (°C)
OFFS
E
T
V
OLTA
GE
OF
FILTE
R
C
IR
C
U
IT
(
R
TI)
(
V
)
WITHOUT OPTIONAL
BALANCE RESISTOR, R3
WITH OPTIONAL
BALANCE RESISTOR, R3
00818-
036
Figure 36. VOS vs. Temperature Performance of the 1 Hz Filter Circuit
Table 5. 1 Hz, Four-Pole Low-Pass Filter Recommended Component Values1
Desired Low Pass
Response
Section 1
Frequency (Hz)
Q
Section 2
Frequency (Hz)
Q
C1 ( F)
C2 (F)
C3 (F)
C4 (F)
Bessel
1.43
0.522
1.60
0.806
0.116
0.107
0.160
0.0616
Butterworth
1.00
0.541
1.00
1.31
0.172
0.147
0.416
0.0609
0.1 dB Chebychev
0.648
0.619
0.948
2.18
0.304
0.198
0.733
0.0385
0.2 dB Chebychev
0.603
0.646
0.941
2.44
0.341
0.204
0.823
0.0347
0.5 dB Chebychev
0.540
0.705
0.932
2.94
0.416
0.209
1.00
0.0290
1.0 dB Chebychev
0.492
0.785
0.925
3.56
0.508
0.206
1.23
0.0242
1
Specified values are for a 3 dB point of 1.0 Hz. For other frequencies, simply scale the C1 through C4 capacitors directly; that is, for a 3 Hz Bessel response,
C1 = 0.0387 μF, C2 = 0.0357 μF, C3 = 0.0533 μF, and C4 = 0.0205 μF.
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