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TLV522

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SNOSD27 – MAY 2016

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7 Detailed Description

7.1 Overview

The TLV522 dual op amplifier is unity-gain stable and can operate on a single supply, making it highly versatile

and easy to use.

The TLV522 is fully specified and tested from 1.7 V to 5.5 V. Parameters that vary significantly with operating

voltages or temperature are shown in the Typical Characteristics curves.

7.2 Functional Block Diagram

7.3 Feature Description

The amplifier's differential inputs consist of a non-inverting input (IN+) and an inverting input (IN–). The device

amplifies only the difference in voltage between the two inputs, which is called the differential input voltage. The

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7.4 Device Functional Modes

7.4.1 Rail-To-Rail Input

The input common-mode voltage range of the TLV522 extends to the supply rails. This is achieved with a

complementary input stage — an N-channel input differential pair in parallel with a P-channel differential pair.

The N-channel pair is active for input voltages close to the positive rail, typically (V+) – 800 mV to 200 mV above

the positive supply, while the P-channel pair is on for inputs from 300 mV below the negative supply to

approximately (V+) – 800 mV. There is a small transition region, typically (V+) – 1.2 V to (V+) – 0.8 V, in which

both pairs are on. This 400 mV transition region can vary 200 mV with process variation. Within the 400 mV

transition region PSRR, CMRR, offset voltage, offset drift, and THD may be degraded compared to operation

outside this region.

7.4.2 Supply Current Changes Over Common Mode

Because of the ultra-low supply current, changes in common mode voltages will cause a noticeable change in

the supply current as the input stages transition through the transition region, as shown in Figure 22 below.