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OPA2379 Datasheet(PDF) 9 Page - Texas Instruments |
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OPA2379 Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 29 page  APPLICATION INFORMATION 5kW OPA379 10mAmax V S V IN V OUT I OVERLOAD NOISE OPERATING VOLTAGE CAPACITIVE LOAD AND STABILITY INPUT COMMON-MODE VOLTAGE RANGE PROTECTING INPUTS FROM 10 to W 20W OPA379 V S V IN V OUT R S R L C L OPA379 OPA2379 OPA4379 www.ti.com ................................................................................................................................................... SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 The OPA379 family of operational amplifiers minimizes power consumption without compromising bandwidth or noise. Power-supply rejection ratio (PSRR), common-mode rejection ratio (CMRR), and open-loop gain (AOL) typical values are 100dB or better. When designing for ultra-low power, choose system components carefully. To minimize current consumption, select large-value resistors. Any Figure 20. Input Current Protection for Voltages resistors will react with stray capacitance in the circuit Exceeding the Supply Voltage and the input capacitance of the operational amplifier. These parasitic RC combinations can affect the stability of the overall system. A feedback capacitor may be required to assure stability and limit Although micropower amplifiers frequently have high overshoot or gain peaking. wideband noise, the OPA379 series offer excellent Good layout practice mandates the use of a 0.1 µF noise performance. Resistors should be chosen bypass capacitor placed closely across the supply carefully because the OPA379 has only 2.8 µV PP of pins. 0.1Hz to 10Hz noise, and 80nV/ √Hz of wideband noise; otherwise, they can become the dominant source of noise. OPA379 series op amps are fully specified and tested from +1.8V to +5.5V (±0.9V to ±2.75V). Parameters that will vary with supply voltage are shown in the Follower configurations with load capacitance in Typical Characteristics curves. excess of 30pF can produce extra overshoot (see typical characteristic Small-Signal Overshoot vs Capacitive Load, Figure 17) and ringing in the output signal. Increasing the gain enhances the ability of the The input common-mode voltage range of the amplifier to drive greater capacitive loads. In OPA379 family typically extends 100mV beyond each unity-gain configurations, capacitive load drive can be supply rail. This rail-to-rail input is achieved using a improved by inserting a small (10 Ω to 20Ω) resistor, complementary input stage. CMRR is specified from RS, in series with the output, as shown in Figure 21. the negative rail to 1V below the positive rail. This resistor significantly reduces ringing while Between (V+) – 1V and (V+) + 0.1V, the amplifier maintaining direct current (dc) performance for purely operates with higher offset voltage because of the capacitive loads. However, if there is a resistive load transition region of the input stage. See the typical in parallel with the capacitive load, a voltage divider is characteristic, Offset Voltage vs Common-Mode created, introducing a dc error at the output and Voltage vs Temperature (Figure 8). slightly reducing the output swing. The error introduced is proportional to the ratio RS/RL, and is generally negligible. OVER-VOLTAGE Normally, input currents are 5pA. However, a large voltage input (greater than 500mV beyond the supply rails) can cause excessive current to flow in or out of the input pins. Therefore, as well as keeping the input voltage below the maximum rating, it is also important to limit the input current to less than 10mA. This limiting is easily accomplished with an input voltage resistor, as shown in Figure 20. Figure 21. Series Resistor in Unity-Gain Buffer Configuration Improves Capacitive Load Drive Copyright © 2005–2008, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Link(s): OPA379 OPA2379 OPA4379 |
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