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OPA348AIDCKR Datasheet(PDF) 9 Page - Texas Instruments |
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OPA348AIDCKR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 32 page  5kW OPA348 10mA max +5V V IN V OUT I OVERLOAD 10 to W 20W OPA348 V+ V IN V OUT R S R L C L 5V 0V G = +1V/V, V = +5V S 10 s/div m V IN V OUT OPA348 OPA2348 OPA4348 www.ti.com SBOS213G – NOVEMBER 2001 – REVISED MARCH 2013 RAIL-TO-RAIL INPUT RAIL-TO-RAIL OUTPUT The input common-mode range extends from (V–) – A class AB output stage with common-source 0.2V to (V+) + 0.2V. For normal operation, inputs transistors is used to achieve rail-to-rail output. This should be limited to this range. The absolute output stage is capable of driving 5k Ω loads maximum input voltage is 500mV beyond the connected to any potential between V+ and ground. supplies. Inputs greater than the input common-mode For light resistive loads (> 100k Ω), the output voltage range but less than the maximum input voltage, while can typically swing to within 18mV from supply rail. not valid, will not cause any damage to the op amp. With moderate resistive loads (10k Ω to 50kΩ), the Unlike some other op amps, if input current is limited output voltage can typically swing to within 100mV of the inputs may go beyond the power supplies without the supply rails while maintaining high open-loop gain phase inversion, as shown in Figure 21. (see the typical characteristic Output Voltage Swing vs Output Current, Figure 6). CAPACITIVE LOAD AND STABILITY The OPA348 in a unity-gain configuration can directly drive up to 250pF pure capacitive load. Increasing the gain enhances the amplifier’s ability to drive greater capacitive loads (see the typical characteristic Small- Signal Overshoot vs Capacitive Load, Figure 13). In unity-gain configurations, capacitive load drive can be improved by inserting a small (10 Ω to 20Ω) resistor, RS, in series with the output, as shown in Figure 23. This significantly reduces ringing while maintaining DC performance for purely capacitive loads. However, if there is a resistive load in parallel with the capacitive load, a voltage divider is created, Figure 21. OPA348—No Phase Inversion with introducing a Direct Current (DC) error at the output Inputs Greater than the Power-Supply Voltage and slightly reducing the output swing. The error introduced is proportional to the ratio RS/RL, and is generally negligible. Normally, input currents are 0.5pA. However, large inputs (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 is easily accomplished with an input voltage resistor, as shown in Figure 22. Figure 23. Series Resistor in Unity-Gain Buffer Configuration Improves Capacitive Load Drive Figure 22. Input Current Protection for Voltages Exceeding the Supply Voltage Copyright © 2001–2013, Texas Instruments Incorporated Submit Documentation Feedback 9 Product Folder Links: OPA348 OPA2348 OPA4348 |
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