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OA1ZHA データシート(PDF) 23 Page - STMicroelectronics |
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OA1ZHA データシート(HTML) 23 Page - STMicroelectronics |
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23 / 35 page  OA1ZHA, OA2ZHA, OA4ZHA Application information DocID025994 Rev 2 23/35 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 OA1ZHA, OA2ZHA and OA4ZHA CMOS op amp (see Figure 47: "Oxygen sensor principle schematic"). Figure 47: Oxygen sensor principle schematic The output voltage is calculated using Equation 2: Equation 2 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 the chopper amplifier of the OA1ZHA, OA2ZHA and OA4ZHA is perfect for this application. In addition, using OA1ZHA, OA2ZHA and OA4ZHA op amp for the O2 sensor application ensures that the measurement of O2 concentration is stable even at different temperature thanks to a very good ∆Vio/∆T. V ou t I R V io R 2 R 1 1 + × – × = |
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