TSZ121 datasheet(22/38 Pages) STMICROELECTRONICS

Il numero della parte	TSZ121

Spiegazioni elettronici	Very high accuracy zero drift micropower 5 V operational amplifiers

PDF	38 Pages

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Produttore elettronici	STMICROELECTRONICS [STMicroelectronics]

Homepage	http://www.st.com

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22 / 38 page

Application information

TSZ121, TSZ122, TSZ124

22/38

DocID023563 Rev 5

5.10

EMI rejection ration (EMIRR)

The electromagnetic interference (EMI) rejection ratio, or EMIRR, describes the EMI

immunity of operational amplifiers. An adverse effect that is common to many op amps is a

change in the offset voltage as a result of RF signal rectification.

The TSZ121, TSZ122, and TSZ124 have been specially designed to minimize susceptibility

to EMIRR and show an extremely good sensitivity. Figure 46: "EMIRR on IN+ pin" shows

the EMIRR IN+ of the TSZ121, TSZ122, and TSZ124 measured from 10 MHz up to

2.4 GHz.

Figure 46: EMIRR on IN+ pin

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 TSZ121, TSZ122, and TSZ124 devices (see Figure 47: "Oxygen

sensor principle schematic").

Figure 47: Oxygen sensor principle schematic

TSZ121 Scheda tecnica(PDF) 22 Page - STMicroelectronics