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OPA2364IDR Datasheet(PDF) 9 Page - Texas Instruments |
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OPA2364IDR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 27 page  OPA363, 2363, 364, 2364, 4364 SBOS259B 9 www.ti.com ENABLE FUNCTION The shutdown (enable) function of the OPA363 is referenced to the negative supply voltage of the operational amplifier. A logic level HIGH enables the op amp. A valid logic HIGH is defined as voltage > 75% of the positive supply applied to the enable pin. The valid logic HIGH signal can be as much as 5.5V above the negative supply, independent of the positive supply voltage. A valid logic LOW is defined as < 0.8V above the negative supply pin. If dual or split power supplies are used, care should be taken to ensure logic input signals are properly referred to the negative supply voltage. This pin should be connected to a valid high or low voltage or driven, not left open circuit. The logic input is a high-impedance CMOS input. Dual op amps are provided separate logic inputs. For battery-oper- ated applications, this feature may be used to greatly reduce the average current and extend battery life. The enable time is 20 µs; disable time is 1µs. When disabled, the output assumes a high-impedance state. This allows the OPA363 to be operated as a “gated” amplifier, or to have its output multiplexed onto a common analog output bus. CAPACITIVE LOAD The OPA363 and OPA364 series op amps can drive a wide range of capacitive loads. However, all op amps under certain conditions may become unstable. Op amp configura- tion, gain, and load value are just a few of the factors to consider when determining stability. An op amp in unity-gain configuration is the most susceptible to the effects of capaci- tive load. The capacitive load reacts with the output resis- tance of the op amp to create a pole in the small-signal response, which degrades the phase margin. In unity gain, the OPA363 and OPA364 series op amps perform well with a pure capacitive load up to approximately 1000pF. The ESR (Equivalent Series Resistance) of the loading capacitor may be sufficient to allow the OPA363 and OPA364 to directly drive very large capacitive loads (> 1 µF). Increasing gain enhances the amplifier’s ability to drive more capacitance. See the typical characteristic “Small-Signal Over- shoot vs Capacitive Load.” One method of improving capacitive load drive in the unity- gain configuration is to insert a 10 Ω to 20Ω resistor in series with the output, as shown in Figure 3. This significantly reduces ringing with large capacitive loads. However, if there is a resistive load in parallel with the capacitive load, it creates a voltage divider introducing a dc error at the output and slightly reduces output swing. This error may be insignifi- cant. For instance, with RL = 10kΩ and RS = 20Ω, there is only about a 0.2% error at the output. INPUT AND ESD PROTECTION All OPA363 and OPA364 pins are static protected with internal ESD protection diodes tied to the supplies. These diodes will provide overdrive protection if the current is externally limited to 10mA, as stated in the absolute maxi- mum ratings and shown in Figure 4. ACHIEVING OUTPUT SWING TO THE OP AMP’S NEGATIVE RAIL Some applications require an accurate output voltage swing from 0V to a positive full-scale voltage. A good single supply op amp may be able to swing within a few mV of single supply ground, but as the output is driven toward 0V, the output stage of the amplifier will prevent the output from reaching the negative supply rail of the amplifier. The output of the OPA363 or OPA364 can be made to swing to ground, or slightly below, on a single supply power source. To do so requires use of another resistor and an additional, more negative power supply than the op amp’s negative supply. A pulldown resistor may be connected between the output and the additional negative supply to pull the output down below the value that the output would otherwise achieve as shown in Figure 5. FIGURE 3. Improving Capacitive Load Drive. FIGURE 4. Input Current Protection. FIGURE 5. OPA363 and OPA364 Swing to Ground. 10 Ω to 20 Ω V+ V IN V OUT R S R L C L OPAx363 OPAx364 V OUT R P = 10kΩ 500 µA OPA363 OPA364 V IN V+ = +5V Op Amp’s Negative Supply Grounded –V = –5V (Additional Negative Supply) 5k Ω OPAx363 10mA max V+ V IN V OUT I OVERLOAD This technique will not work with all op amps. The output stage of the OPA363 and OPA364 allows the output voltage to be pulled below that of most op amps, if approximately 500 µA is maintained through the output stage. To calculate the appropriate value load resistor and negative supply, RL = –V/500µA. The OPA363 and OPA364 have been characterized to perform well under the described conditions, maintaining excellent accuracy down to 0V and as low as –10mV. Limiting and nonlinearity occur below –10mV, with linearity returning as the output is again driven above –10mV. |
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