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參數(shù)資料
| 型號： | AD8221BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST PREC LN 18MA 8SOIC |
| 設(shè)計資源： | 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) |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| -3db帶寬： | 825kHz |
| 電流 - 輸入偏壓： | 200pA |
| 電壓 - 輸入偏移： | 25µV |
| 電流 - 電源： | 900µA |
| 電流 - 輸出 / 通道： | 18mA |
| 電壓 - 電源，單路/雙路(±)： | 4.6 V ~ 36 V，±2.3 V ~ 18 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SO |
| 包裝： | 帶卷 (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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| AD8221-EVAL | 制造商:AD 制造商全稱: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:- 包裝:管件 零件狀態(tài):在售 放大器類型:儀表 電路數(shù):1 輸出類型:- 壓擺率:2 V/μs -3db 帶寬:825kHz 電流 - 輸入偏置:2nA 電壓 - 輸入失調(diào):70μV 電流 - 電源:900μA 電流 - 輸出/通道:18mA 電壓 - 電源，單/雙（±）:±2.3 V ~ 18 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商器件封裝:8-MSOP 標(biāo)準(zhǔn)包裝:50 |
| AD8221TRMZ-EP-R7 | 功能描述:IC OPAMP INSTR 825KHZ 制造商:analog devices inc. 系列:- 包裝:剪切帶（CT） 零件狀態(tài):Digi-Key 停止供應(yīng) 放大器類型:儀表 電路數(shù):1 輸出類型:- 壓擺率:2 V/μs -3db 帶寬:825kHz 電流 - 輸入偏置:2nA 電壓 - 輸入失調(diào):70μV 電流 - 電源:900μA 電流 - 輸出/通道:18mA 電壓 - 電源，單/雙（±）:±2.3 V ~ 18 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應(yīng)商器件封裝:8-MSOP 標(biāo)準(zhǔn)包裝: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 制造商全稱: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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