Connect a capacitor to Pin 4 (CFILT
參數(shù)資料
型號: AD628ARZ
廠商: Analog Devices Inc
文件頁數(shù): 13/21頁
文件大?。?/td> 0K
描述: IC AMP PGA DIFF PREC 8SOIC
產(chǎn)品培訓(xùn)模塊: Top Five Instrumentation Amplifier Problems
標(biāo)準(zhǔn)包裝: 98
放大器類型: 電流檢測
電路數(shù): 1
轉(zhuǎn)換速率: 0.3 V/µs
-3db帶寬: 600kHz
電流 - 輸入偏壓: 1.5nA
電壓 - 輸入偏移: 150µV
電流 - 電源: 1.6mA
電壓 - 電源,單路/雙路(±): 4.5 V ~ 36 V,±2.25 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: 771 (CN2011-ZH PDF)
AD628
Rev. G | Page 19 of 20
FILTER CAPACITOR VALUES
Connect a capacitor to Pin 4 (CFILT) to implement a low-pass
filter. The capacitor value is
C = 15.9/ft (μF)
where ft is the desired 3 dB filter frequency.
Table 7 shows several frequencies and their closest standard
capacitor values.
Table 7. Capacitor Values for Various Filter Frequencies
Frequency (Hz)
Capacitor Value (μF)
10
1.5
50
0.33
60
0.27
100
0.15
400
0.039
1 k
0.015
5 k
0.0033
10 k
0.0015
KELVIN CONNECTION
In certain applications, it may be desirable to connect the
inverting input of an amplifier to a remote reference point.
This eliminates errors resulting in circuit losses in inter-
connecting wiring. The AD628 is particularly suited for this
type of connection. In Figure 35, a 10 kΩ resistor added in the
feedback matches the source impedance of A2. This is
described in more detail in the Gain Adjustment section.
+IN
–IN
A2
+VS
–IN
+IN
VREF
OUT
CIRCUIT
LOSS
LOAD
+IN
–IN
G = +0.1
A1
AD628
–VS
10k
100k
VS/2
CFILT
RG
10k
02
99
2-
0
33
Figure 35. Kelvin Connection
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