參數(shù)資料
型號: AD825AR
廠商: Analog Devices Inc
文件頁數(shù): 3/12頁
文件大?。?/td> 0K
描述: IC OPAMP JFET GP 26MHZ 8SOIC
標(biāo)準(zhǔn)包裝: 98
放大器類型: J-FET
電路數(shù): 1
轉(zhuǎn)換速率: 140 V/µs
增益帶寬積: 26MHz
-3db帶寬: 46MHz
電流 - 輸入偏壓: 15pA
電壓 - 輸入偏移: 1000µV
電流 - 電源: 6.5mA
電流 - 輸出 / 通道: 50mA
電壓 - 電源,單路/雙路(±): 10 V ~ 36 V,±5 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SO
包裝: 管件
產(chǎn)品目錄頁面: 766 (CN2011-ZH PDF)
AD825
Rev. F | Page 11 of 12
SECOND-ORDER LOW-PASS FILTER
A second-order Butterworth low-pass filter can be implemented
using the AD825 as shown in Figure 33. The extremely low bias
currents of the AD825 allow the use of large resistor values and,
consequently, small capacitor values without concern for
developing large offset errors. Low current noise is another
factor in permitting the use of large resistors without having to
worry about the resultant voltage noise.
With the values shown, the corner frequency will be 1 MHz.
The equations for component selection are shown below. Note
that the noninverting input (and the inverting input) has an
input capacitance of 6 pF. As a result, the calculated value of C1
(12 pF) is reduced to 6 pF.
R1
f
C1
CUTOFF
π
=
2
414
.
1
()
R1
f
farads
C2
CUTOFF
π
=
2
707
.
0
(
)
Ω
k
100
Ω
k
10
to
Typically
Selected
User
R2
R1
=
A plot of the filter frequency response is shown in Figure 34;
better than 40 dB of high frequency rejection is provided.
AD825
C3
0.1
F
C4
0.1
F
VOUT
VIN
C2
6pF
–5V
C1
24pF
R1
9.31k
R2
9.31k
+5V
00876-E
-031
Figure 33. Second-Order Butterworth Low-Pass Filter
FREQUENCY (Hz)
10k
100M
100k
HI
GH
FRE
Q
UE
NCY
RE
J
E
CTI
O
N
(dB)
1M
10M
0
–10
–20
–30
–40
–50
–60
–70
–80
00876-E
-032
Figure 34. Frequency Response of Second-Order Butterworth Filter
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