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OPA377AIDR Datasheet(PDF) 10 Page - Texas Instruments |
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OPA377AIDR Datasheet(HTML) 10 Page - Texas Instruments |
10 / 26 page 5kW OPA377 10mAmax V+ V IN V OUT I OVERLOAD 10 to W 20W V+ V IN V OUT R S R L C L OPA377 OPA377 OPA2377 OPA4377 SBOS504B – FEBRUARY 2010 – REVISED JANUARY 2011 www.ti.com INPUT AND ESD PROTECTION CAPACITIVE LOAD AND STABILITY The OPA377 family incorporates internal electrostatic The OPA377 series of amplifiers may be used in discharge (ESD) protection circuits on all pins. In the applications where driving a capacitive load is case of input and output pins, this protection primarily required. As with all op amps, there may be specific consists of current steering diodes connected instances where the OPAx377 can become unstable, between the input and power-supply pins. These ESD leading to oscillation. The particular op amp circuit protection diodes also provide in-circuit, input configuration, layout, gain, and output loading are overdrive protection, as long as the current is limited some of the factors to consider when establishing to 10mA as stated in the Absolute Maximum Ratings. whether an amplifier will be stable in operation. An op Figure 23 shows how a series input resistor may be amp in the unity-gain (+1V/V) buffer configuration and added to the driven input to limit the input current. driving a capacitive load exhibits a greater tendency The added resistor contributes thermal noise at the to be unstable than an amplifier operated at a higher amplifier input and its value should be kept to a noise gain. The capacitive load, in conjunction with minimum in noise-sensitive applications. 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 OPAx377 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 23. Input Current Protection 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 24. This resistor EMI SUSCEPTIBILITY AND INPUT FILTERING significantly reduces ringing while maintaining dc performance for purely capacitive loads. However, if Operational amplifiers vary in susceptibility to there is a resistive load in parallel with the capacitive electromagnetic interference (EMI). If conducted EMI load, a voltage divider is created, introducing a gain enters the operational amplifier, the dc offset error at the output and slightly reducing the output observed at the amplifier output may shift from the swing. The error introduced is proportional to the ratio nominal value while the EMI is present. This shift is a RS/RL, and is generally negligible at low output result of signal rectification associated with the current levels. internal semiconductor junctions. While all amplifier pin functions can be affected by EMI, the input pins are likely to be the most susceptible. The OPA377 operational amplifier family incorporates an internal input low-pass filter that reduces the amplifier response to EMI. Both common-mode and differential mode filtering are provided by the input filter. The filter is designed for a cutoff frequency of approximately 75MHz ( –3dB), with a roll-off of 20dB per decade. Figure 24. Improving Capacitive Load Drive 10 Submit Documentation Feedback © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): OPA377 OPA2377 OPA4377 |
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