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AN3249 Datasheet(PDF) 1 Page - STMicroelectronics |
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AN3249 Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 7 page December 2013 DocID017760 Rev 2 1/7 AN3249 Application note M24LR series internal capacitance considerations for antenna tuning 1 Introduction The datasheet of the M24LR series devices(a) specifies a typical internal tuning capacitance value of 27.5 pF measured at 0.5 VPEAK. While this value is correct in production test conditions, more considerations have to be taken into account for tuning the antenna in an real application environment. This document describes the M24LR series tuning capacitance variation as a function of input voltage, explains the M24LR series tuning capacitance specification and gives a robust tuning capacitance target for the inductive loop antenna design. a. I2C/ISO15693 Dual Interface EEPROM IC Table 1: Applicable products Type Applicable products Dual Interface EEPROM M24LR series(1) 1. While the considerations introduced in this document applies to the entire M24LR series, the M24LR64-R has been used hereafter for specific measurements purpose. www.st.com |
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