參數(shù)資料
型號(hào): AD8625ARZ-REEL7
廠商: Analog Devices Inc
文件頁(yè)數(shù): 9/20頁(yè)
文件大?。?/td> 0K
描述: IC OPAMP JFET 5MHZ QUAD 14SOIC
標(biāo)準(zhǔn)包裝: 1,000
放大器類(lèi)型: J-FET
電路數(shù): 4
輸出類(lèi)型: 滿擺幅
轉(zhuǎn)換速率: 5 V/µs
增益帶寬積: 5MHz
電流 - 輸入偏壓: 0.25pA
電壓 - 輸入偏移: 350µV
電流 - 電源: 710µA
電流 - 輸出 / 通道: 15mA
電壓 - 電源,單路/雙路(±): 5 V ~ 26 V,±2.5 V ~ 13 V
工作溫度: -40°C ~ 85°C
安裝類(lèi)型: 表面貼裝
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 14-SOIC
包裝: 帶卷 (TR)
Data Sheet
AD8625/AD8626/AD8627
Rev. F | Page 17 of 20
EIGHT-POLE SALLEN KEY LOW-PASS FILTER
The AD862x’s high input impedance and dc precision make it a
great selection for active filters. Due to the very low bias current
of the AD862x, high value resistors can be used to construct low
frequency filters. The AD862x’s picoamp-level input currents
contribute minimal dc errors. Figure 49 shows an example of a
10 Hz, 8-pole Sallen Key filter constructed using the AD862x.
Different numbers of the AD862x can be used depending on
the desired response, which is shown in Figure 48. The high
value used for R1 minimizes interaction with signal source
resistance. Pole placement in this version of the filter minimizes
the Q associated with the lower pole section of the filter. This
eliminates any peaking of the noise contribution of resistors in
the preceding sections, minimizing the inherent output voltage
noise of the filter.
03023-047
V2
V4
V3
V1
FREQUENCY (Hz)
VOLTAGE
(V)
0.1
0
0.4
0.8
1.2
1
10
100
1k
Figure 48. Frequency Response Output at Different Stages
of the Low-Pass Filter
03023-048
VIN
VDD
VEE
R1
162.3k
R2
162.3k
3
2
11
1
4
U1
R3
25k
C2
96.19
F
D
V3
R10
191.4k
R5
191.4k
U2
R4
25k
C4
69.14
F
D
R11
286.5k
R7
286.5k
U3
R6
25k
C6
30.86
F
D
R12
815.8k
R9
815.8k
U4
R8
25k
C8
3.805
F
D
C1
100
F
C3
1/4
AD8625
1/4
AD8625
1/4
AD8625
1/4
AD8625
100
F
C5
100
F
C7
100
F
V1
V2
V3
V4
Figure 49. 10 Hz, 8-Pole Sallen Key Low-Pass Filter
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