参数资料
| 型号： | AD621BRZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST LDRIFT LP 18MA 8SOIC |
| 产品培训模块： | Instrumentation Amplifiers Performance |
| 标准包装： | 1 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 1.2 V/µs |
| -3db带宽： | 800kHz |
| 电流 - 输入偏压： | 500pA |
| 电压 - 输入偏移： | 50µV |
| 电流 - 电源： | 900µA |
| 电流 - 输出 / 通道： | 18mA |
| 电压 - 电源，单路/双路(±)： | ±2.3 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 产品目录页面： | 770 (CN2011-ZH PDF) |
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
“local 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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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| AD621BRZ-RL | 功能描述:IC AMP INST LDRIFT LP 18MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:Excalibur™ 放大器类型:J-FET 电路数:1 输出类型:- 转换速率:45 V/µs 增益带宽积:10MHz -3db带宽:- 电流 - 输入偏压:20pA 电压 - 输入偏移:490µV 电流 - 电源:1.7mA 电流 - 输出 / 通道:48mA 电压 - 电源，单路/双路(±):4.5 V ~ 38 V，±2.25 V ~ 19 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:带卷 (TR) |
| AD621S | 制造商:AD 制造商全称:Analog Devices 功能描述:Low Drift, Low Power Instrumentation Amplifier |
| AD621SQ/883B | 功能描述:仪表放大器 LOW DRIFT LOW POWER INAMP RoHS:否 制造商:Texas Instruments 通道数量: 输入补偿电压:150 V 可用增益调整: 最大输入电阻:10 kOhms 共模抑制比（最小值）:88 dB 工作电源电压:2.7 V to 36 V 电源电流:200 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:MSOP-8 封装:Bulk |
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