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AD8627AKSZ-R2 Datasheet(PDF) 17 Page - Analog Devices

Part # AD8627AKSZ-R2
Description  Precision Low Power Single-Supply JFET Amplifiers
PDF  20 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

AD8627AKSZ-R2 Datasheet(HTML) 17 Page - Analog Devices

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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.
V2
V4
V3
V1
FREQUENCY (Hz)
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
VIN
VDD
VEE
R1
162.3k
Ω
R2
162.3k
Ω
3
2
11
1
4
U1
R3
25k
Ω
C2
96.19
µF
D
D
V3
R10
191.4k
Ω
R5
191.4k
Ω
U2
R4
25k
Ω
C4
69.14
µF
D
R11
286.5k
Ω
R7
286.5k
Ω
U3
R6
25k
Ω
C6
30.86
µF
D
R12
815.8k
Ω
R9
815.8k
Ω
U4
R8
25k
Ω
C8
3.805
µF
D
C1
100
µF
C3
1/4
AD8625
1/4
AD8625
1/4
AD8625
1/4
AD8625
100
µF
C5
100
µF
C7
100
µF
V1
V2
V3
V4
Figure 49. 10 Hz, 8-Pole Sallen Key Low-Pass Filter



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