100 pF

100 nF

1 nF

1 µF

10 µF

10 nF

TS321

SLOS489C – DECEMBER 2005 – REVISED APRIL 2015

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Feature Description (continued)

8.3.4 Input Common Mode Range

The valid common mode range is from device ground pin to VCC – 1.5 V (VCC – 2 V across temperature).

Inputs may exceed VCC up to the maximum VCC without device damage. At least one input must be in the valid

input common mode range for output to be correct phase. If both inputs exceed valid range then output phase is

undefined. If either input is less than -0.3 V then input current should be limited to 1 mA and output phase is

undefined.

8.3.5 Stability With High Capacitive Loads

Operational amplifiers have reduced phase margin when there is a direct capacitance on the output. The stability

is affected most when the amplifier is set to unity gain. Small signal response to a step input of 100 mV reveals

the loop stability with a range of capacitors. See application note SLVA381 to correlate response waveform to

phase margin. The responses at 1 nF or less indicate acceptable phase margin. The responses at 1 uF and

above indicate good phase margin.

Figure 7. Small Signal Response

8.4 Device Functional Modes

The TS321 is powered on when the supply is connected. This device can be operated as a single supply

operational amplifier or dual supply amplifier depending on the application.

8

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