OPA310 datasheet(29/55 Pages) TI

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load

out

iso

-V

Figure 8-3. Improving Capacitive Load Drive

8.3.5 Overload Recovery

Overload recovery is defined as the time required for the operational amplifier output to recover from a saturated

state to a linear state. The output devices of the operational amplifier enter a saturation region when the output

voltage exceeds the rated operating voltage, because of the high input voltage or high gain. After one of the

output devices enters the saturation region, the output stage requires additional time to return to the linear

operating state which is referred to as overload recovery time. After the output stage returns to linear operating

state, the amplifier begins to slew at the specified slew rate. Therefore, the propagation delay (in case of an

overload condition) is the sum of the overload recovery time and the slew time.

The overload recovery time for the OPAx310 family is approximately 0.75-µs typical.

8.3.6 EMI Rejection

The OPAx310 uses integrated electromagnetic interference (EMI) filtering to reduce the effects of EMI from

sources such as wireless communications (radio frequency interference - RFI) and densely-populated boards

with a mix of analog signal chain and digital components. EMI immunity can be improved with circuit design

techniques; the OPAx310 benefits from these design improvements. Texas Instruments has developed the ability

to accurately measure and quantify the immunity of an operational amplifier over a broad frequency spectrum

extending from 10 MHz to 6 GHz. Figure 8-4 shows the results of this testing on the OPAx310. Table 8-1

shows the EMIRR IN+ values for the OPAx310 at particular frequencies commonly encountered in real-world

applications. The EMI Rejection Ratio of Operational Amplifiers application report contains detailed information

on the topic of EMIRR performance relating to op amps and is available for download from www.ti.com.

Frequency (Hz)

100

110

120

10M

100M

D42_

Figure 8-4. EMIRR Testing

www.ti.com

OPA310, OPA2310, OPA4310

SBOSAA1C – APRIL 2022 – REVISED SEPTEMBER 2022

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