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參數(shù)資料
| 型號(hào)： | AD621BRZ-R7 |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 7/16頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST LDRIFT LP 18MA 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 1,000 |
| 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： | 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) |
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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| AD621BRZ-RL | 功能描述:IC AMP INST LDRIFT LP 18MA 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD621S | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Drift, Low Power Instrumentation Amplifier |
| AD621SQ/883B | 功能描述:儀表放大器 LOW DRIFT LOW POWER INAMP RoHS:否 制造商:Texas Instruments 通道數(shù)量: 輸入補(bǔ)償電壓:150 V 可用增益調(diào)整: 最大輸入電阻:10 kOhms 共模抑制比（最小值）:88 dB 工作電源電壓:2.7 V to 36 V 電源電流:200 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:MSOP-8 封裝:Bulk |
| AD621SQ883B2 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Drift, Low Power Instrumentation Amplifier |
| AD622 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Low Cost Instrumentation Amplifier |
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