VOUT – INPUT + INPUT
參數(shù)資料
型號: AD620BRZ-RL
廠商: Analog Devices Inc
文件頁數(shù): 10/21頁
文件大小: 0K
描述: IC AMP INST LP LN 18MA 8SOIC
設(shè)計(jì)資源: Low Cost Programmable Gain Instrumentation Amplifier Circuit Using ADG1611 and AD620 (CN0146)
標(biāo)準(zhǔn)包裝: 2,500
放大器類型: 儀表
電路數(shù): 1
轉(zhuǎn)換速率: 1.2 V/µs
-3db帶寬: 1MHz
電流 - 輸入偏壓: 500pA
電壓 - 輸入偏移: 15µV
電流 - 電源: 900µA
電流 - 輸出 / 通道: 18mA
電壓 - 電源,單路/雙路(±): 4.6 V ~ 36 V,±2.3 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: 帶卷 (TR)
AD620
Rev. H | Page 17 of 20
GROUND RETURNS FOR INPUT BIAS CURRENTS
VOUT
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
+VS
–VS
AD620
00775-0-050
Input bias currents are those currents necessary to bias the
input transistors of an amplifier. There must be a direct return
path for these currents. Therefore, when amplifying “floating”
input sources, such as transformers or ac-coupled sources, there
must be a dc path from each input to ground, as shown in
Figure 46, Figure 47, and Figure 48. Refer to A Designer’s Guide
to Instrumentation Amplifiers (free from Analog Devices) for
more information regarding in-amp applications.
VOUT
AD620
– INPUT
RG
TO POWER
SUPPLY
GROUND
REFERENCE
+ INPUT
+VS
–VS
LOAD
00775-
0-
049
Figure 47. Ground Returns for Bias Currents with Thermocouple Inputs
100k
Ω
VOUT
AD620
– INPUT
+ INPUT
RG
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
100k
Ω
–VS
+VS
00775-
0-
051
Figure 46. Ground Returns for Bias Currents with Transformer-Coupled Inputs
Figure 48. Ground Returns for Bias Currents with AC-Coupled Inputs
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