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OPA363IDBVRG4 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA363IDBVRG4 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 38 page 10 to W 20W V+ V IN V OUT R S R L C L OPAx363 OPAx364 OPA363, OPA2363 OPA364, OPA2364, OPA4364 SBOS259C – SEPTEMBER 2002 – REVISED MAY 2013 www.ti.com OPERATING VOLTAGE The OPA363 and OPA364 series op amp parameters are fully specified from +1.8V to +5.5V. Single 0.1 μF bypass capacitors should be placed across supply pins and as close to the part as possible. Supply voltages higher than 5.5V (absolute maximum) may cause permanent damage to the amplifier. Many specifications apply from –40°C to +125°C. Parameters that vary significantly with operating voltages or temperature are shown in the Typical Characteristics. 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 greater than 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 less than 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- operated 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 configuration, 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 capacitive load. The capacitive load reacts with the output resistance 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 Figure 13. 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 23. 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 insignificant. For instance, with RL = 10k Ω and RS = 20Ω, there is only about a 0.2% error at the output. Figure 23. Improving Capacitive Load Drive 10 Submit Documentation Feedback Copyright © 2002–2013, Texas Instruments Incorporated Product Folder Links: OPA363 OPA2363 OPA364 OPA2364 OPA4364 |
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