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TLV8544 データシート(PDF) 10 Page - Texas Instruments |
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TLV8544 データシート(HTML) 10 Page - Texas Instruments |
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10 / 18 page  10 M: - + VOUT 10 M: 10 M: VIN 10 M: 10 M: 270 pF 270 pF 270 pF CR2032 Coin Cell 225 mAh = 5 circuits @ 9.5 yrs. 60 Hz Twin T Notch Filter AV = 2 V/V 10 M: 270 pF VBATT VBATT = 3V o 2V @ end of life Remote Sensor Signal + 60 Hz To ADC Signal × 2 (No 60 Hz) 10 TLV8544 SNOSD29 – DECEMBER 2016 www.ti.com Product Folder Links: TLV8544 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 8.1 Application Information The TLV8544 is a ultra-low power operational amplifier that provides 8kHz bandwidth with only 500nA typical quiescent current, and near precision drift specifications at a low cost. These rail-to-rail input and output amplifiers are specifically designed for battery-powered applications. The input common-mode voltage range extends to the power-supply rails and the output swings to within millivolts of the rails, maintaining a wide dynamic range. 8.2 Typical Application: 60 Hz Twin "T" Notch Filter Figure 9. 60 Hz Notch Filter 8.2.1 Design Requirements Small signals from transducers in remote and distributed sensing applications commonly suffer strong 60 Hz interference from AC power lines. The circuit of Figure 9 notches out the 60 Hz and provides a system gain of AV = 2 for the sensor signal represented by a 1 kHz sine wave. Similar stages may be cascaded to remove 2nd and 3rd harmonics of 60 Hz. Thanks to the nA power consumption of the TLV8544, even 5 such circuits can run for 9.5 years from a small CR2032 lithium cell. These batteries have a nominal voltage of 3 V and an end of life voltage of 2 V. With an operating voltage from 1.7V to 3.6V the TLV8544 can function over this voltage range. 8.2.2 Detailed Design Procedure The notch frequency is set by: F0 = 1 / 2πRC. (2) To achieve a 60 Hz notch use R = 10 M Ω and C = 270 pF. If eliminating 50 Hz noise, use R = 11.8 MΩ and C = 270 pF. The Twin T Notch Filter works by having two separate paths from VIN to the amplifier’s input. A low frequency path through the series input resistors and another separate high frequency path through the series input capacitors. However, at frequencies around the notch frequency, the two paths have opposing phase angles and the two signals will tend to cancel at the amplifier’s input. |
同様の部品番号 - TLV8544 |
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同様の説明 - TLV8544 |
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