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參數資料
| 型號： | AD621BR |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low Drift, Low Power Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 215 uV OFFSET-MAX, 0.2 MHz BAND WIDTH, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數： | 15/16頁 |
| 文件大?。?/td> | 663K |
| 代理商： | AD621BR |
AD621
REV. A
–15–
GROUNDING
Since the AD621 output voltage is developed with respect to the
potential on the reference terminal, it can solve many grounding
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 41). 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 hun-
dreds of millivolts of error. Therefore, separate ground returns
should be provided to minimize the current flow from the sensi-
tive 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
ADC
DIGITAL
DATA
OUTPUT
+
1
μ
F
AD621
0.1
μ
F
AD585
S/H
3
5
9
11
15
6
2
4
7
1
11
7
6
4
0.1
μ
F
1
μ
F
1
μ
F
Figure 41. 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 42a
through 42c. Refer to the
Instrumentation Amplifier Application
Guide
(free from Analog Devices) for more information regard-
ing in amp applications.
V
OUT
7
+V
S
–V
S
AD621
– INPUT
+ INPUT
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
2
3
4
5
6
Figure 42a. Ground Returns for Bias Currents when Using
Transformer Input Coupling
V
OUT
7
+V
S
–V
S
AD621
– INPUT
+ INPUT
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
2
3
4
5
6
Figure 42b. Ground Returns for Bias Currents when Using
a Thermocouple Input
100k
V
OUT
7
+V
S
–V
S
AD621
– INPUT
+ INPUT
LOAD
TO POWER
SUPPLY
GROUND
REFERENCE
2
3
4
5
6
100k
Figure 42c. Ground Returns for Bias Currents when Using
AC Input Coupling
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相關代理商/技術參數 |
參數描述 |
|---|---|
| AD621BR-REEL | 功能描述:IC AMP INST LDRIFT LP 18MA 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數:1 輸出類型:- 轉換速率: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） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD621BR-REEL7 | 功能描述:IC AMP INST LDRIFT LP 18MA 8SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數:1 輸出類型:- 轉換速率: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） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
| AD621BRZ | 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:- 標準包裝:50 系列:- 放大器類型:J-FET 電路數:2 輸出類型:- 轉換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應商設備封裝:8-PDIP 包裝:管件 |
| AD621BRZ | 制造商:Analog Devices 功能描述:IC, INSTRUMENT AMP, 800KHZ, 130DB SOIC-8 |
| AD621BRZ-R7 | 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:- 標準包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數:1 輸出類型:- 轉換速率: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） 供應商設備封裝:8-SOIC 包裝:帶卷 (TR) |
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