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            EEPW首頁 > 醫(yī)療電子 > 設(shè)計應(yīng)用 > TI INA333 ECG心電圖應(yīng)用方案

            TI INA333 ECG心電圖應(yīng)用方案

            作者: 時間:2012-05-30 來源:網(wǎng)絡(luò) 收藏

            公司的333是微功耗零漂移軌到軌精密儀表放大器,采用單一外接電阻可把增益設(shè)定在1到1000之間.工作電壓低到1.8V(±0.9V),靜態(tài)電流僅為50uA,有極低的噪音密度(50nV/ Hz) .

            本文引用地址:http://www.biyoush.com/article/198987.htm

            廣泛用于橋式放大器,心電圖()放大器,壓力傳感器,醫(yī)療儀器和手提儀表,熱電偶放大器和數(shù)據(jù)采集.本文介紹了333的主要性能, 方框圖, 基本的連接電路,以及心電圖系統(tǒng)方框圖,非常低功耗的應(yīng)用電路和血糖儀應(yīng)用電路以及數(shù)據(jù)采集系統(tǒng)電路圖.

            333 Micro-Power (50uA), Zeroslash;-Drift, Rail-to-Rail Out Instrumentation Amplifier

            The INA333 is a low-power, precision instrumentation amplifier offering excellent accuracy. The versatile 3-op amp design, small size, and low power make it ideal for a wide range of portable applications.

            A single external resistor sets any gain from 1 to 1000. The INA333 is designed to use an industry-standard gain equation: G = 1 + (100k /RG).

            The INA333 provides very low offset voltage (25micro;V, G ≥ 100), excellent offset voltage drift (0.1micro;V/°C, G ≥ 100), and high common-mode rejection (100dB at G ≥ 100). It operates with power supplies as low as 1.8V (±0.9V), and quiescent current is only 50micro;A—ideal for battery-operated systems. Using autocalibration techniques to ensure excellent precision over the extended industrial temperature range, the INA333 also offers exceptionally low noise density (50nV/ Hz) that extends down to dc.

            The INA333 is available in both MSOP-8 and DFN-8 surface-mount packages and is specified over the TA = -40°C to +125°C temperature range.

            主要特性:

            LOW OFFSET VOLTAGE: 25micro;V (max), G=100

            LOW DRIFT: 0.1micro;V/°C, G=100

            LOW NOISE: 50nV/ Hz, G=100

            HIGH CMRR: 100dB (min), G=10

            LOW INPUT BIAS CURRENT: 200pA (max)

            SUPPLY RANGE: +1.8V to +5.5V

            INPUT VOLTAGE: (V-) +0.1V to (V+) -0.1V

            OUTPUT RANGE: (V-) +0.05V to (V+) -0.05V

            LOW QUIESCENT CURRENT: 50micro;A

            OPERANG TEMPERATURE: -40°C to +125°C

            RFI FILTERED INPUTS

            MSOP-8 AND DFN-8 PACKAGES

            應(yīng)用:

            BRIDGE AMPLIFIERS

            ECG AMPLIFIERS

            PRESSURE SENSORS

            MEDICAL INSTRUMENTAON

            PORTABLE INSTRUMENTATION

            WEIGH SCALES

            THERMOCOUPLE AMPLIFIERS

            RTD SENSOR AMPLIFIERS

            DATA ACQUISITION

            圖1. INA333方框圖

            圖2. INA333基本連接電路

            圖3.ECG心電圖系統(tǒng)方框圖

            圖4.帶右腿驅(qū)動的ECG放大框圖

            圖5.單電源非常低功耗的ECG應(yīng)用電路

            圖6.用于以電池為能源的手持設(shè)備的低功耗對數(shù)功能的應(yīng)用電路(血糖儀案例)

            圖7.用于PT100 RTD的四線3V調(diào)理電路(帶可編程增益采集系統(tǒng))

            更多醫(yī)療電子信息請關(guān)注:21ic醫(yī)療電子頻道

            熱電偶相關(guān)文章:熱電偶原理


            關(guān)鍵詞: INA ECG TI

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