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数据搜索系统，热门电子元器件搜索 |
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INA331 数据表(PDF) 13 Page - Texas Instruments |
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INA331 数据表(HTML) 13 Page - Texas Instruments |
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13 / 24 page  INA331, INA2331 SBOS215C 13 www.ti.com APPLICATION CIRCUITS MEDICAL ECG APPLICATIONS Figure 9 shows the INA331 configured to serve as a low-cost ECG amplifier, suitable for moderate accuracy heart-rate applications such as fitness equipment. The input signals are obtained from the left and right arms of the patient. The common-mode voltage is set by two 2M Ω resistors. This potential through a buffer provides an optional right leg drive. Filtering can be modified to suit application needs by chang- ing the capacitor value of the output filter. LOW-POWER, SINGLE-SUPPLY DATA ACQUISITION SYSTEMS Refer to Figure 4 to see the INA331 configured to drive an ADS7818. Functioning at frequencies of up to 500kHz, the INA331 is ideal for low-power data acquisition. FIGURE 9. Simplified ECG Circuit for Medical Applications. OPA336 OPA336 1M Ω REF 1M Ω 1M Ω 10k Ω 10k Ω 2k Ω 2k Ω 1.6nF 0.1 µF 100k Ω 100k Ω +5V V R V R V R = +2.5V 2M Ω 2M Ω INA331 5 3 2 8 7 6 4 1 V+ Shutdown RG V IN– V– V IN+ V OUT PUT OPA336 Right Arm Left Arm OPA336 10k Ω Shield Drive 390k Ω Shield Right Leg V R |
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