C

load

+

±

V

in

V

out

+V

s

R

iso

-V

s

Figure 6-3. Improving Capacitive Load Drive

6.3.5 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-Q1 family is approximately 0.75µs typical.

6.3.6 EMI Rejection

The OPAx310-Q1 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-Q1 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 10MHz to 6GHz. Figure 6-4 shows the results of this testing on the OPAx310-Q1.

Table 6-1 shows the EMIRR IN+ values for the OPAx310-Q1 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)

20

30

40

50

60

70

80

90

100

110

120

10M

100M

1G

D42_

Figure 6-4. EMIRR Testing

OPA310-Q1

SBOSAI0A – DECEMBER 2023 – REVISED MAY 2024

www.ti.com

26

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