参数资料
| 型号： | AD8221BRZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24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： | 2,500 |
| 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 19 of 24
REFERENCE TERMINAL
As shown in Figure 43, the reference terminal, REF, is at one
end of a 10 kΩ resistor. The output of the instrumentation
amplifier is referenced to the voltage on the REF terminal; this
is useful when the output signal needs to be offset to a precise
midsupply level. For example, a voltage source can be tied to the
REF pin to level-shift the output so that the AD8221 can interface
with an ADC. The allowable reference voltage range is a function
of the gain, input, and supply voltage. The REF pin should not
exceed either +VS or –VS by more than 0.5 V.
For best performance, source impedance to the REF terminal
should be kept low, because parasitic resistance can adversely
affect CMRR and gain accuracy.
POWER SUPPLY REGULATION AND BYPASSING
A stable dc voltage should be used to power the instrumentation
amplifier. Noise on the supply pins can adversely affect
performance. Bypass capacitors should be used to decouple
the amplifier.
A 0.1 F capacitor should be placed close to each supply pin.
As shown in Figure 47, a 10 F tantalum capacitor can be used
further away from the part. In most cases, it can be shared by
other precision integrated circuits.
AD8221
+VS
+IN
–IN
LOAD
REF
0.1F
10F
0.1F
10F
–VS
VOUT
03149-
046
Figure 47. Supply Decoupling, REF, and Output Referred to Local Ground
INPUT BIAS CURRENT RETURN PATH
The input bias current of the AD8221 must have a return path
to common. When the source, such as a thermocouple, cannot
provide a return current path, one should be created, as shown
+VS
REF
TRANSFORMER
THERMOCOUPLE
–VS
AD8221
+VS
REF
–VS
AD8221
CAPACITOR COUPLED
+VS
REF
C
R
C
–VS
AD8221
1
fHIGH-PASS =
2
πRC
03149-
047
Figure 48. Creating an IBIAS Path
INPUT PROTECTION
All terminals of the AD8221 are protected against ESD, 1 kV
Human Body Model. In addition, the input structure allows for
dc overload conditions below the negative supply, VS. The
internal 400 resistors limit current in the event of a negative
fault condition. However, in the case of a dc overload voltage
above the positive supply, +VS, a large current flows directly
through the ESD diode to the positive rail. Therefore, an external
resistor should be used in series with the input to limit current
for voltages above +Vs. In either scenario, the AD8221 can
safely handle a continuous 6 mA current, I = VIN/REXT for
positive overvoltage and I = VIN/(400 + REXT) for negative
overvoltage.
For applications where the AD8221 encounters extreme
overload voltages, as in cardiac defibrillators, external series
resistors, and low leakage diode clamps, such as BAV199Ls,
FJH1100s, or SP720s should be used.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| AD8222 | 制造商:AD 制造商全称:Analog Devices 功能描述:10 MHz, 20 V/レs, G = 1, 10, 100, 1000 i CMOS㈢ Programmable Gain Instrumentation Amplifier |
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