參數(shù)資料
型號(hào)： AD8221ARM-REEL7
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 0K
描述： IC AMP INST PREC LN 18MA 8MSOP
設(shè)計(jì)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： 1,000
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： 500pA
電壓 - 輸入偏移： 60µV
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-TSSOP，8-MSOP（0.118"，3.00mm 寬）
供應(yīng)商設(shè)備封裝： 8-MSOP
包裝： 帶卷 (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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