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TLV07

SBOS832A – JULY 2017 – REVISED AUGUST 2017

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Feature Description (continued)

Another common question involves what happens to the amplifier if an input signal is applied to the input when

the power supplies (V+ or V–) are at 0 V. This question depends on the supply characteristic when at 0 V, or at a

level below the input signal amplitude. If the supplies appear as high impedance, then the input source supplies

the operational amplifier current through the current-steering diodes. This state is not a normal bias condition;

most likely, the amplifier does not operate normally. If the supplies are low impedance, then the current through

the steering diodes can become quite high. The current level depends on the ability of the input source to deliver

current, and any resistance in the input path.

If there is any uncertainty about the ability of the supply to absorb this current, add external Zener diodes to the

supply pins; see Figure 34. Select the Zener voltage so that the diode does not turn on during normal operation.

However, the Zener voltage must be low enough so that the Zener diode conducts if the supply pin begins to rise

above the safe-operating, supply-voltage level.

The TLV07 input pins are protected from excessive differential voltage with back-to-back diodes; see Figure 34.

In most circuit applications, the input protection circuitry has no effect. However, in low-gain or G = 1 circuits,

fast-ramping input signals can forward-bias these diodes because the output of the amplifier cannot respond

rapidly enough to the input ramp. If the input signal is fast enough to create this forward-bias condition, limit the

input signal current to 10 mA or less. If the input signal current is not inherently limited, use an input series

resistor to limit the input signal current.

7.4 Device Functional Modes

7.4.1 Overload Recovery

Overload recovery is defined as the time required for the op amp output to recover from the saturated state to

the linear state. The output devices of the op amp enter the saturation region when the output voltage exceeds

the rated operating voltage resulting from the high input voltage or the high gain. After the device enters the

saturation region, the charge carriers in the output devices must have time to return back to the normal state.

After the charge carriers return back to the equilibrium state, the device begins to slew at the normal slew rate.

As a result, 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 TLV07 is approximately 2 µs.