参数资料
型号: AD8627AKSZ-REEL
厂商: Analog Devices Inc
文件页数: 9/20页
文件大小: 0K
描述: IC OPAMP JFET 5MHZ PREC SC70-5
设计资源: 4 mA to 20 mA Process Control Loop Using AD5662 (CN0009)
标准包装: 10,000
放大器类型: J-FET
电路数: 1
输出类型: 满摆幅
转换速率: 5 V/µs
增益带宽积: 5MHz
电流 - 输入偏压: 0.25pA
电压 - 输入偏移: 350µV
电流 - 电源: 710µA
电流 - 输出 / 通道: 15mA
电压 - 电源,单路/双路(±): 5 V ~ 26 V,±2.5 V ~ 13 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 6-TSSOP(5 引线),SC-88A,SOT-353
供应商设备封装: SC-70-5
包装: 带卷 (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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