参数资料
| 型号： | AD8221BRZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 14/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LN 18MA 8SOIC |
| 设计资源： | Low Cost, High Voltage, Programmable Gain Instrumentation Amplifier Using AD5292 and AD8221 (CN0114) Low Cost Programmable Gain Instrumentation Amplifier Circuit Using ADG1611 and AD620 (CN0146) |
| 标准包装： | 1,000 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 2 V/µs |
| -3db带宽： | 825kHz |
| 电流 - 输入偏压： | 200pA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 900µA |
| 电流 - 输出 / 通道： | 18mA |
| 电压 - 电源，单路/双路(±)： | 4.6 V ~ 36 V，±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： | 带卷 (TR) |
AD8221
Rev. C | Page 21 of 24
In this topology, an OP27 sets the reference voltage of the
AD8221. The output signal of the instrumentation amplifier is
taken across the OUT pin and the REF pin. Two 1 k resistors
and a 499 resistor attenuate the ±10 V signal to +4 V. An
optional capacitor, C1, can serve as an antialiasing filter. An
AD8022 is used to drive the ADC.
This topology has five benefits. In addition to level-shifting and
attenuation, very little noise is contributed to the system. Noise
from R1 and R2 is common to both of the inputs of the ADC
and is easily rejected. R5 adds a third of the dominant noise and
therefore makes a negligible contribution to the noise of the
system. The attenuator divides the noise from R3 and R4. Likewise,
its noise contribution is negligible. The fourth benefit of this
interface circuit is that the acquisition time of the AD8221 is
reduced by a factor of 2. With the help of the OP27, the AD8221
only needs to deliver one-half of the full swing; therefore, signals
can settle more quickly. Lastly, the AD8022 settles quickly,
which is helpful because the shorter the settling time, the
more bits that can be resolved when the ADC acquires data.
This configuration provides attenuation, a level-shift, and a
convenient interface with a differential input ADC while
maintaining performance.
AC-COUPLED INSTRUMENTATION AMPLIFIER
Measuring small signals that are in the noise or offset of the
amplifier can be a challenge. Figure 52 shows a circuit that can
improve the resolution of small ac signals. The large gain
reduces the referred input noise of the amplifier to 8 nV/√Hz.
Thus, smaller signals can be measured because the noise floor is
lower. DC offsets that would have been gained by 100 are
eliminated from the output of the AD8221 by the integrator
feedback network.
At low frequencies, the OP1177 forces the output of the AD8221 to
0 V. Once a signal exceeds fHIGH-PASS, the AD8221 outputs the
amplified input signal.
AD8221
OP1177
R
15.8k
+VS
+IN
–IN
0.1F
10F
REF
C
1F
–VS
+VS
–VS
R
499
1
2πRC
fHIGH-PASS =
03149-
051
Figure 52. AC-Coupled Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8221BRZ-RL | 功能描述:IC AMP INST PREC LN 18MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD8221-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD8221TRMZ-EP | 功能描述:IC OPAMP INSTR 825KHZ 制造商:analog devices inc. 系列:- 包装:管件 零件状态:在售 放大器类型:仪表 电路数:1 输出类型:- 压摆率:2 V/μs -3db 带宽:825kHz 电流 - 输入偏置:2nA 电压 - 输入失调:70μV 电流 - 电源:900μA 电流 - 输出/通道:18mA 电压 - 电源，单/双（±）:±2.3 V ~ 18 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:50 |
| AD8221TRMZ-EP-R7 | 功能描述:IC OPAMP INSTR 825KHZ 制造商:analog devices inc. 系列:- 包装:剪切带（CT） 零件状态:Digi-Key 停止供應 放大器类型:仪表 电路数:1 输出类型:- 压摆率:2 V/μs -3db 带宽:825kHz 电流 - 输入偏置:2nA 电压 - 输入失调:70μV 电流 - 电源:900μA 电流 - 输出/通道:18mA 电压 - 电源，单/双（±）:±2.3 V ~ 18 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:1 |
| AD8221XR | 制造商:Analog Devices 功能描述:SOIC IN AMP WITH FIXED GAIN OF 5 - Bulk |
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