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參數(shù)資料
| 型號： | AD8220BRMZ-RL |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 18/28頁 |
| 文件大小： | 0K |
| 描述： | IC AMP INST JFET R-R 15MA 8MSOP |
| 產(chǎn)品培訓(xùn)模塊： | Power Line Monitoring |
| 設(shè)計資源： | Fully Isolated Input Module Based on AD7793, ADuM5401, and a High Performance In-Amp (CN0067) |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 放大器類型： | 儀表 |
| 電路數(shù)： | 1 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 2 V/µs |
| -3db帶寬： | 1.5MHz |
| 電流 - 輸入偏壓： | 10pA |
| 電壓 - 輸入偏移： | 125µV |
| 電流 - 電源： | 750µA |
| 電流 - 輸出 / 通道： | 15mA |
| 電壓 - 電源，單路/雙路(±)： | 4.5 V ~ 36 V，±2.25 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) |
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AD8220
Rev. B | Page 25 of 28
ELECTROCARDIOGRAM SIGNAL CONDITIONING
The AD8220 makes an excellent input amplifier for next
generation ECGs. Its small size, high CMRR over frequency,
rail-to-rail output, and JFET inputs are well suited for this
application. Potentials measured on the skin range from 0.2 mV
to 2 mV. The AD8220 solves many of the typical challenges of
measuring these body surface potentials. The high CMRR of
the AD8220 helps reject common-mode signals that come in
the form of line noise or high frequency EMI from equipment
in the operating room. Its rail-to-rail output offers a wide
dynamic range allowing for higher gains than would be possible
using other instrumentation amplifiers. JFET inputs offer a
large input capacitance of 5 pF. A natural RC filter is formed
reducing high frequency noise when series input resistors are
used in front of the AD8220 (see the RF Interference section).
In addition, the AD8220 JFET inputs have ultralow input
bias current and no current noise, making it useful for ECG
applications where there are often large impedances. The MSOP
and the optimal pinout of the AD8220 allow smaller footprints
and more efficient layout, paving the way for next-generation
portable ECGs.
Figure 67 shows an example ECG schematic. Following the
AD8220 is a 0.033 Hz high-pass filter, formed by the 4.7 μF
capacitor and the 1 MΩ resistor, which removes the dc offset
that develops between the electrodes. An additional gain of 50,
provided by the AD8618, makes use of the 0 V to 5 V input
range of the ADC. An active, fifth-order, low-pass Bessel filter
removes signals greater than approximately 160 Hz. An OP2177
buffers, inverts, and gains the common-mode voltage taken at
the midpoint of the AD8220 gain setting resistors. This right-
leg drive circuit helps cancel common-mode signals by
inverting the common-mode signal and driving it back into the
body. A 499 kΩ series resistor at the output of the OP2177
limits the current driven into the body.
ADC
AD7685
AD8618
+5V
2.7nF
500
AD8618
14.5k
19.3k
2.5V
22nF
4.7F
REF
+5V
REFERENCE
ADR435
68nF
+5V
AD8618
+5V
1.15k
4.99k
2.5V
33nF
19.3k
14.5k
33nF
LOW-PASS FIFTH ORDER FILTER AT 157Hz
AD8618
+5V
–5V
+5V
47nF
14k
57.6k
1.18k
G= +50
4.7F
2.5V
1M
12.7k
499k
220pF
HIGH-PASS FILTER 0.033Hz
INSTRUMENTATION
AMPLIFIER
G=+14
AD8220
+5V
4.12k
24.9k
–5V
+5V
OP AMPS
OP2177
866k
68pF
AB
C
035
79-
032
15k
–5V
+5V
–5V
+5V
2.2pF
10pF
10k
Figure 67. Example ECG Schematic
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AD8220-EVAL | 制造商:AD 制造商全稱:Analog Devices 功能描述:JFET Input Instrumentation Amplifier with Rail-to-Rail Output in MSOP Package |
| AD8220-EVALZ | 制造商:Analog Devices 功能描述:Evaluation Board For JFET Instrumentation Amplifier Evaluation Board 制造商:Analog Devices 功能描述:JFET INSTRUMENTATION AMP EVAL BD - Bulk 制造商:Analog Devices 功能描述:AD8220 Evaluation Board |
| AD8220TRMZ-EP | 功能描述:IC OP AMP JFET RR 8MSOP 制造商:analog devices inc. 系列:- 包裝:管件 零件狀態(tài):在售 放大器類型:J-FET 電路數(shù):1 輸出類型:滿擺幅 壓擺率:2 V/μs -3db 帶寬:1.5MHz 電流 - 電源:750μA 電流 - 輸出/通道:15mA 電壓 - 電源，單/雙（±）:4.5 V ~ 36 V，±2.25 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 |
| AD8220TRMZ-EP-R7 | 功能描述:IC OP AMP JFET RR 8MSOP 制造商:analog devices inc. 系列:- 包裝:帶卷（TR） 零件狀態(tài):在售 放大器類型:J-FET 電路數(shù):1 輸出類型:滿擺幅 壓擺率:2 V/μs -3db 帶寬:1.5MHz 電流 - 電源:750μA 電壓 - 電源，單/雙（±）:4.5 V ~ 36 V，±2.25 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:1,000 |
| AD8220WARMZ | 功能描述:IC AMP INST JFET R-R 15MA 8MSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):4 輸出類型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱:OP481GRUZ-REELCT |
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