TSV521A datasheet(13/27 Pages) STMICROELECTRONICS

13 / 27 page

TSV521, TSV522, TSV524, TSV521A, TSV522A, TSV524A

Application information

Doc ID 022743 Rev 1

13/27

Application information

4.1

Operating voltages

The amplifiers of the TSV52x series can operate from 2.7 to 5.5 V. Their parameters are

fully specified for 2.7, 3.3 and 5 V power supplies. However, the parameters are very stable

in the full VCC range and several characterization curves show the TSV52x device

characteristics at 2.7 V. Additionally, the main specifications are guaranteed in extended

temperature ranges from -40 to +125 °C.

4.2

Common mode voltage range

The TSV52x devices are built with two complementary PMOS and NMOS input differential

pairs. The devices have a rail-to-rail input and the input common mode range is extended

from VCC- - 0.1 V to VCC+ +0.1 V.

The N channel pair is active for input voltage close to the positive rail typically (VCC+ -0.7 V)

to 100 mv above the positive rail.

The P channel pair is active for input voltage close to the negative rail typically 100 mV

below the negative rail to VCC- +0.7 V.

And between VCC- + 0.7 V and VCC+ - 0.7 V the both N and P pairs are active.

When the both pairs work together it allows to increase the speed of the TSV52x device.

This architecture improves a lot the merit factor of the whole device. In the transition region,

the performance of CMR, SVR, Vio (Figure 25 and Figure 26) and THD is slightly degraded.

Figure 25.

Input offset voltage vs. input

common mode at VCC = 2.7 V

Figure 26.

Input offset voltage vs. input

common mode at VCC = 5.5 V

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