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參數(shù)資料
| 型號： | AD8221BRZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 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) |
| 標準包裝： | 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 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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| 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 標準包裝: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 標準包裝: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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