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OPA369AIDCKT Datasheet(PDF) 9 Page - Texas Instruments |
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OPA369AIDCKT Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 20 page  APPLICATION INFORMATION PROTECTING INPUTS FROM OPERATING VOLTAGE 5kW OPA369 10mAmax V S V IN V OUT I OVERLOAD Current-limitingresistor requiredifinputvoltage exceedssupplyrailsby ³ 0.5V. INPUT COMMON-MODE VOLTAGE RANGE OPA369 OPA2369 www.ti.com ............................................................................................................................................ SBOS414B – AUGUST 2007 – REVISED DECEMBER 2008 The OPA369 family of operational amplifiers The input common-mode voltage range of the minimizes power consumption and operates on OPA369 family typically extends to each supply rail. supply voltages as low as 1.8V. Power-supply CMRR is specified from the negative rail to the rejection ratio (PSRR), common-mode rejection ratio positive rail. See Figure 4, Normalized Offset Voltage (CMRR), and open-loop gain (AOL) typical values are vs Common-Mode Voltage. in the range of 100dB or better. When designing for ultralow power, choose system OVER-VOLTAGE components carefully. To minimize current consumption, select large-value resistors. Any Input currents are typically 10pA. However, large resistors will react with stray capacitance in the circuit inputs (greater than 500mV beyond the supply rails) and the input capacitance of the operational amplifier. can cause excessive current to flow in or out of the These parasitic RC combinations can affect the input pins. Therefore, in addition to keeping the input stability of the overall system. A feedback capacitor voltage between the supply rails, it is also important may be required to assure stability and limit to limit the input current to less than 10mA. This overshoot or gain peaking. limiting is easily accomplished with an input resistor, as shown in Figure 24. Good layout practice mandates the use of a 0.1 µF bypass capacitor placed closely across the supply pins. OPA369 series op amps are fully specified and tested from +1.8V to +5.5V (±0.9V to ±2.75V). Parameters that vary significantly with supply voltage are shown in the Typical Characteristic curves. Figure 24. Input Current Protection for Voltages The OPA369 family is designed to eliminate the input Exceeding the Supply Voltage offset transition region typically present in most rail-to-rail complementary stage operational amplifiers, which allows the OPA369 family of amplifiers to provide superior common-mode performance over the entire input range. Copyright © 2007–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): OPA369 OPA2369 |
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