参数资料
| 型号： | AD8221ARMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LN 18MA 8MSOP |
| 产品培训模块： | Power Line Monitoring Top Five Instrumentation Amplifier Problems Instrument Amp Primer Overview Instrumentation Amplifiers Performance |
| 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： | 50 |
| 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： | 500pA |
| 电压 - 输入偏移： | 60µV |
| 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-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 773 (CN2011-ZH PDF) |
AD8221
Rev. C | Page 18 of 24
GAIN SELECTION
Placing a resistor across the RG terminals set the gain of
AD8221, which can be calculated by referring to Table 6 or
by using the gain equation.
1
kΩ
4
.
49
=
G
RG
Table 6. Gains Achieved Using 1% Resistors
1% Standard Table Value of R
G (Ω)
Calculated Gain
49.9 k
1.990
12.4 k
4.984
5.49 k
9.998
2.61 k
19.93
1.00 k
50.40
499
100.0
249
199.4
100
495.0
49.9
991.0
The AD8221 defaults to G = 1 when no gain resistor is used.
Gain accuracy is determined by the absolute tolerance of RG.
The TC of the external gain resistor increases the gain drift of
the instrumentation amplifier. Gain error and gain drift are kept
to a minimum when the gain resistor is not used.
LAYOUT
Careful board layout maximizes system performance. Traces
from the gain setting resistor to the RG pins should be kept as
short as possible to minimize parasitic inductance. To ensure
the most accurate output, the trace from the REF pin should
either be connected to the local ground of the AD8221, as shown
in Figure 47, or connected to a voltage that is referenced to the
local ground of the AD8221.
Common-Mode Rejection
One benefit of the high CMRR over frequency of the AD8221 is
that it has greater immunity to disturbances, such as line noise
and its associated harmonics, than do typical instrumentation
amplifiers. Typically, these amplifiers have CMRR fall-off at
200 Hz; common-mode filters are often used to compensate for
this shortcoming. The AD8221 is able to reject CMRR over a
greater frequency range, reducing the need for filtering.
A well implemented layout helps to maintain the high CMRR
over frequency of the AD8221. Input source impedance and
capacitance should be closely matched. In addition, source
resistance and capacitance should be placed as close to the
inputs as permissible.
Grounding
The output voltage of the AD8221 is developed with respect to
the potential on the reference terminal. Care should be taken to
tie REF to the appropriate local ground.
In mixed-signal environments, low level analog signals need to
be isolated from the noisy digital environment. Many ADCs
have separate analog and digital ground pins. Although it is
convenient to tie both grounds to a single ground plane, the
current traveling through the ground wires and PC board may
cause hundreds of millivolts of error. Therefore, separate analog
and digital ground returns should be used to minimize the
current flow from sensitive points to the system ground. An
example layout is shown in Figure 45 and Figure 46.
03149-
044
Figure 45. Top Layer of the AD8221-EVAL
03149-
045
Figure 46. Bottom Layer of the AD8221-EVAL
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8221ARMZ | 制造商:Analog Devices 功能描述:AMP INSTRUMENT HI CMRR SMD 8221 |
| AD8221ARMZ-R7 | 功能描述:IC AMP INST PREC LN 18MA 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:2pA 电压 - 输入偏移:1000µV 电流 - 电源:85µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):1.8 V ~ 6 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOICN 包装:剪切带 (CT) 产品目录页面:680 (CN2011-ZH PDF) 其它名称:MCP6L04T-E/SLCT |
| AD8221ARMZ-RL | 功能描述:IC AMP INST PREC LN 18MA 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| AD8221AR-REEL | 功能描述:IC AMP INST PREC LN 18MA 8SOIC RoHS:否 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:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 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:0°C ~ 70°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 |
| AD8221AR-REEL7 | 功能描述:IC AMP INST PREC LN 18MA 8SOIC RoHS:否 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:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 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:0°C ~ 70°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 |
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