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| 型號： | AD8222HACPZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 13/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC AMP INST DUAL PREC LN 16LFCSP |
| 標(biāo)準(zhǔn)包裝： | 5,000 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 2 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| -3db帶寬： | 1.2MHz |
| 電流 - 輸入偏壓： | 500pA |
| 電壓 - 輸入偏移： | 120µV |
| 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： | 16-VQFN，CSP |
| 供應(yīng)商設(shè)備封裝： | 16-LFCSP（4x4） |
| 包裝： | 帶卷 (TR) |
AD8222
Rev. A | Page 20 of 24
AD8222
(DIFF OUT)
100pF
NPO
5%
100pF
NPO
5%
1000pF
–IN
+IN
0.1F
10F
0.1F
10F
–12V
+12V
1k
+
IN+
VDD
GND
REF
10F
X5R
AD7688
IN–
0.1F
+5V
ADR435
GND
VIN
VOUT
0.1F
+12V
0.1F
+5V REF
05
94
7-
0
51
+IN2
REF2
+5V REF
+OUT
–OUT
1k
2200pF
1k
Figure 51. Driving a Differential ADC
DRIVING A DIFFERENTIAL INPUT ADC
The AD8222 can be configured in differential output mode
to drive a differential analog-to-digital converter. Figure 51
illustrates several of the concepts.
RFI and Antialiasing Filter
The 1 kΩ resistors, 1000 pF capacitor, and 100 pF capacitors in
front of the in-amp form filter circuitry that performs many
functions. The 1 kΩ and 100 pF capacitors form common-mode
filters that protect the amplifier from incoming radio frequency
signals. Without the filtering, these RFI signals can be rectified
in the in-amp. The 1 kΩ resistors provide some overvoltage
protection. The 1 kΩ resistors and 1000 pF capacitor form a
76 kHz antialiasing filter for the ADC.
Note that the 100 pF capacitors are 5% COG/NPO types. These
capacitors match well over time and temperature, which keeps
the system CMRR high over frequency.
Second Antialiasing Filter
A 1 kΩ resistor and 2200 pF capacitor are placed between each
AD8222 output and ADC input. They create a 72 kHz low-pass
filter for another stage of antialiasing protection.
These four elements also improve distortion performance. The
2200 pF capacitor provides charge to the switched capacitor
front end of the ADC, and the 1 kΩ resistor shields the AD8222
from driving any sharp current changes. If the application
requires a lower frequency antialiasing filter and is distortion
sensitive, increase the value of the capacitor rather than the
resistor.
The 1 kΩ resistors can also protect an ADC from overvoltages.
Because the AD8222 runs on wider supply voltages than a
typical ADC, there is a possibility of overdriving the ADC. This
is not an issue with a PulSAR converter, such as the AD7688.
Its input can handle a 130 mA overdrive, which is much higher
than the short-circuit limit of the AD8222. However, other conver-
ters have less robust inputs and may need the added protection.
Reference
The ADR435 supplies a reference voltage to both the ADC and
the AD8222. Because REF2 on the AD8222 is grounded, the
common-mode output voltage is precisely half the reference
voltage, exactly where it needs to be for the ADC.
PRECISION STRAIN GAGE
The low offset and high CMRR over frequency of the AD8222
make it an excellent candidate for both ac and dc bridge measure-
ments. As shown in Figure 52, the bridge can be connected to
the inputs of the amplifier directly.
5V
2.5V
10F
0.1F
AD8222
+IN
–IN
RG
350
+
–
05
94
7-
05
0
Figure 52. Precision Strain Gauge
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| AD8222HACPZ-WP | 功能描述:IC AMP INST DUAL PREC LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD8222HBCPZ-R7 | 功能描述:IC AMP INST DUAL PREC LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD8222HBCPZ-RL | 功能描述:IC AMP INST DUAL PREC LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 放大器類型:J-FET 電路數(shù):2 輸出類型:- 轉(zhuǎn)換速率:3.5 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:30pA 電壓 - 輸入偏移:2000µV 電流 - 電源:200µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作溫度:0°C ~ 70°C 安裝類型:通孔 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-PDIP 包裝:管件 |
| AD8222HBCPZ-WP | 功能描述:IC AMP INST DUAL PREC LN 16LFCSP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:Excalibur™ 放大器類型:J-FET 電路數(shù):1 輸出類型:- 轉(zhuǎn)換速率:45 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:20pA 電壓 - 輸入偏移:490µV 電流 - 電源:1.7mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 38 V，±2.25 V ~ 19 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-SOIC 包裝:帶卷 (TR) |
| AD8223 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
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