The TLV915x-Q1 is a 16V, rail-to-rail input operational amplifier with an input common-mode range that extends 200mV beyond either supply rail. This wide range is achieved with paralleled complementary N-channel and P-channel differential input pairs, as Figure 6-6 shows. The N-channel pair is active for input voltages close to the positive rail, typically from (V+) – 1V to 100mV above the positive supply. The P-channel pair is active for inputs from 100mV below the negative supply to approximately (V+) – 2V. There is a small transition region, typically from (V+) – 2V to (V+) – 1V in which both input pairs are on. This transition region can vary modestly with process variation and within this region, the following factors can degrade, in comparison to operation outside this region:

• PSRR
• CMRR
• Offset Voltage
• Offset Drift
• Noise
• THD performance

Figure 5-5 shows this transition region for a typical device in terms of input voltage offset in more detail.

For more information on common-mode voltage range and PMOS/NMOS pair interaction, see Op Amps With Complementary-Pair Input Stages application note.