TSX711 datasheet(22/31 Pages) STMICROELECTRONICS

Teilenummer	TSX711

Bauteilbeschribung	Low-power, precision, rail-to-rail, 2.7 MHz, 16 V CMOS operational amplifiers

PDF	31 Pages

Scroll/Zoom	100%

Hersteller	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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22 / 31 page

Application information

TSX711, TSX711A, TSX712

22/31

DocID025959 Rev 5

5.11

Application examples

5.11.1

Oxygen sensor

The electrochemical sensor creates a current proportional to the concentration of the gas

being measured. This current is converted into voltage thanks to R resistance. This voltage

is then amplified by the TSX711, TSX711A, or the TSX712 (see Figure 36: "Oxygen sensor

principle schematic").

Figure 36: Oxygen sensor principle schematic

The output voltage is calculated using Equation 8:

Equation 8

As the current delivered by the O2 sensor is extremely low, the impact of the Vio can

become significant with a traditional operational amplifier. The use of a precision amplifier

like the TSX711, TSX711A, TSX712 is perfect for this application.

In addition, using the TSX711, TSX711A, TSX712 for the O2 sensor application ensures

that the measurement of O2 concentration is stable, even at different temperatures, thanks

to a small ΔVio/ΔT.

O2_ sensor

VCC

Vout

ou t

–

TSX711 Datenblatt(PDF) 22 Page - STMicroelectronics