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OPA376 Datasheet(PDF) 11 Page - Texas Instruments |
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OPA376 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 31 page  C 1 1nF C 150pF 2 R 3 5.49kW R 1 5.49kW R 2 12.4kW V+ V OUT V IN OPA376 (V+)/2 5kW OPA376 10mAmax V+ V IN V OUT I OVERLOAD 10 to W 20W V+ V IN V OUT R S R L C L OPA376 OPA376 OPA2376 OPA4376 www.ti.com SBOS406F – JUNE 2007 – REVISED MARCH 2013 INPUT AND ESD PROTECTION load, a voltage divider is created, introducing a gain error at the output and slightly reducing the output The OPA376 family incorporates internal electrostatic swing. The error introduced is proportional to the ratio discharge (ESD) protection circuits on all pins. In the RS/RL, and is generally negligible at low output case of input and output pins, this protection primarily current levels. consists of current steering diodes connected between the input and power-supply pins. These ESD protection diodes also provide in-circuit, input overdrive protection, as long as the current is limited to 10mA as stated in the Absolute Maximum Ratings. Figure 24 shows how a series input resistor may be added to the driven input to limit the input current. The added resistor contributes thermal noise at the amplifier input and its value should be kept to a minimum in noise-sensitive applications. Figure 25. Improving Capacitive Load Drive ACTIVE FILTERING The OPA376 series is well-suited for filter applications requiring a wide bandwidth, fast slew rate, low-noise, single-supply operational amplifier. Figure 26 shows a 50kHz, 2nd-order, low-pass filter. The components have been selected to provide a Figure 24. Input Current Protection maximally-flat Butterworth response. Beyond the cutoff frequency, roll-off is –40dB/dec. The Butterworth response is ideal for applications CAPACITIVE LOAD AND STABILITY requiring predictable gain characteristics such as the The OPA376 series of amplifiers may be used in anti-aliasing filter used ahead of an analog-to-digital applications where driving a capacitive load is converter (ADC). required. As with all op amps, there may be specific instances where the OPAx376 can become unstable, leading to oscillation. The particular op amp circuit configuration, layout, gain, and output loading are some of the factors to consider when establishing whether an amplifier will be stable in operation. An op amp in the unity-gain (+1V/V) buffer configuration and driving a capacitive load exhibits a greater tendency to be unstable than an amplifier operated at a higher noise gain. The capacitive load, in conjunction with the op amp output resistance, creates a pole within the feedback loop that degrades the phase margin. The degradation of the phase margin increases as the capacitive loading increases. The OPAx376 in a unity-gain configuration can directly drive up to 250pF pure capacitive load. Increasing the gain enhances the ability of the amplifier to drive greater capacitive loads; see the typical characteristic plot, Small-Signal Overshoot vs Capacitive Load. In unity-gain configurations, Figure 26. Second-Order Butterworth 50kHz Low- capacitive load drive can be improved by inserting a Pass Filter small (10 Ω to 20Ω) resistor, RS, in series with the output, as shown in Figure 25. This resistor significantly reduces ringing while maintaining dc performance for purely capacitive loads. However, if there is a resistive load in parallel with the capacitive Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: OPA376 OPA2376 OPA4376 |
Similar Part No. - OPA376_15 |
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Similar Description - OPA376_15 |
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