参数资料
| 型号： | AD8221ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 13/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LN 18MA 8SOIC |
| 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： | 98 |
| 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-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： | 773 (CN2011-ZH PDF) |
AD8221
Rev. C | Page 20 of 24
RF INTERFERENCE
RF rectification is often a problem when amplifiers are used in
applications where there are strong RF signals. The disturbance
can appear as a small dc offset voltage. High frequency signals
can be filtered with a low-pass RC network placed at the input
of the instrumentation amplifier, as shown in Figure 49. The
filter limits the input signal bandwidth according to the following
relationship:
)
2
(
π
2
1
C
D
Diff
C
R
FilterFreq
+
=
C
CM
RC
FilterFreq
π
2
1
=
where CD ≥ 10CC.
R
AD8221
+15V
+IN
–IN
0.1F
10F
0.1F
REF
VOUT
–15V
R1
499
CD
CC
10nF
1nF
03149-
048
4.02k
4.02k
Figure 49. RFI Suppression
CD affects the difference signal, and CC affects the common-
mode signal. Values of R and CC should be chosen to minimize
RFI. Mismatch between the R × CC at the positive input and the
R × CC at the negative input degrades the CMRR of the AD8221.
By using a value of CD one magnitude larger than CC, the effect
of the mismatch is reduced, and therefore, performance is
improved.
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8221
make it an excellent candidate for bridge measurements. As
shown in Figure 50, the bridge can be directly connected to
the inputs of the amplifier.
+5V
+2.5V
03149-
049
10F
0.1F
AD8221
+IN
–IN
R
350
350
350
350
+
–
Figure 50. Precision Strain Gage
CONDITIONING ±10 V SIGNALS FOR A +5 V
DIFFERENTIAL INPUT ADC
There is a need in many applications to condition ±10 V signals.
However, many of today’s ADCs and digital ICs operate on
much lower, single-supply voltages. Furthermore, new ADCs
have differential inputs because they provide better common-
mode rejection, noise immunity, and performance at low supply
voltages. Interfacing a ±10 V, single-ended instrumentation
amplifier to a +5 V, differential ADC can be a challenge.
Interfacing the instrumentation amplifier to the ADC requires
attenuation and a level shift. A solution is shown in Figure 51.
+12V
+IN
–IN
0.1F
10F
0.1F
10F
–12V
R3
1k
+2.5V
R4
1k
REF
R5
499
R2
10k
R1
10k
C1
470pF
+12V
0.1F
–12V
+12V
+5V
0.1F
10nF
0.1F
–12V
+12V
0.1F
–12V
R6
27.4
R7
27.4
C2
220F
10F
0.1F
22F
+5V
2.5V
220nF
10nF
AD8221
AD8022
OP27
AD8022
AD7723
VIN(+)
AVDD
AGND DGND REF1 REF2
DVDD
VIN(–)
AD780
GND
+VIN
VOUT
03149-
050
()
Figure 51. Interfacing to a Differential Input ADC
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8221ARZ | 制造商:Analog Devices 功能描述:IC INSTRUMENTATION AMPLIFIER SINGLE S |
| AD8221ARZ-R7 | 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:100 系列:- 放大器类型:通用 电路数:1 输出类型:- 转换速率:0.2 V/µs 增益带宽积:- -3db带宽:- 电流 - 输入偏压:100pA 电压 - 输入偏移:30µV 电流 - 电源:380µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):±2 V ~ 18 V 工作温度:0°C ~ 70°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 |
| AD8221ARZ-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:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 放大器类型:电流检测 电路数:1 输出类型:- 转换速率:- 增益带宽积:125kHz -3db带宽:- 电流 - 输入偏压:- 电压 - 输入偏移:100µV 电流 - 电源:1.1µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-WFBGA，CSPBGA 供应商设备封装:4-UCSP（2x2） 包装:剪切带 (CT) 其它名称:MAX9634WERS+TCT |
| AD8221BR | 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:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8221BRM | 制造商:Analog Devices 功能描述:SOIC IN AMP WITH FIXED GAIN OF 5 - Bulk |
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