參數(shù)資料
型號(hào): AD621BN
廠商: Analog Devices Inc
文件頁數(shù): 7/16頁
文件大?。?/td> 0K
描述: IC AMP INST LDRIFT LP 18MA 8DIP
產(chǎn)品變化通告: Product Discontinuance 27/Oct/2011
標(biāo)準(zhǔn)包裝: 50
放大器類型: 儀表
電路數(shù): 1
轉(zhuǎn)換速率: 1.2 V/µs
-3db帶寬: 800kHz
電流 - 輸入偏壓: 500pA
電壓 - 輸入偏移: 50µV
電流 - 電源: 900µA
電流 - 輸出 / 通道: 18mA
電壓 - 電源,單路/雙路(±): ±2.3 V ~ 18 V
工作溫度: -40°C ~ 85°C
安裝類型: 通孔
封裝/外殼: 8-DIP(0.300",7.62mm)
供應(yīng)商設(shè)備封裝: 8-PDIP
包裝: 管件
AD621
REV. B
–15–
GROUNDING
Since the AD621 output voltage is developed with respect to the
potential on the reference terminal, it can solve many ground-
ing problems by simply tying the REF pin to the appropriate
“l(fā)ocal ground.”
In order to isolate low level analog signals from a noisy digital
environment, many data-acquisition components have separate
analog and digital ground pins (Figure 15). It would be conve-
nient to use a single ground line; however, current through
ground wires and PC runs of the circuit card can cause hundreds
of millivolts of error. Therefore, separate ground returns should
be provided to minimize the current flow from the sensitive
points to the system ground. These ground returns must be tied
together at some point, usually best at the ADC package as shown.
DIGITAL P.S.
+5V
C
ANALOG P.S.
+15V C –15V
AD574A
+
AD621
AD585
S/H
ADC
5
9
11
15
6
2
4
7
1
11
7
6
4
0.1 F
1 F
3
DIGITAL
DATA
OUTPUT
0.1 F
1 F1 F
Figure 15. Basic Grounding Practice
GROUND RETURNS FOR INPUT BIAS CURRENTS
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 Figures 16a
through 16c. Refer to the Instrumentation Amplifier Application
Guide (free from Analog Devices) for more information regard-
ing in amp applications.
+VS
AD621
LOAD
–VS
REFERENCE
TO POWER SUPPLY GROUND
+INPUT
–INPUT
VOUT
Figure 16a. Ground Returns for Bias Currents when Using
Transformer Input Coupling
+VS
AD621
LOAD
–VS
REFERENCE
TO POWER SUPPLY GROUND
+INPUT
–INPUT
VOUT
Figure 16b. Ground Returns for Bias Currents when Using
a Thermocouple Input
100k
–INPUT
AD621
+INPUT
+VS
–VS
VOUT
LOAD
REFERENCE
TO POWER SUPPLY GROUND
Figure 16c. Ground Returns for Bias Currents when Using
AC Input Coupling
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