AN4409 datasheet(5/8 Pages) STMICROELECTRONICS

부품명	AN4409

상세설명	Using the same antenna for M24LRXXE-R and M24SRXX-Y Dual Interface EEPROM families

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제조업체	STMICROELECTRONICS [STMicroelectronics]

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5 / 8 page

DocID025583 Rev 1

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AN4409

Tuning capacitance specification vs tuning reference value

Tuning capacitance specification vs tuning reference

value

Figure 2 shows the serial equivalent tuning capacitance typical variation of either the

M24LRXXE-R or M24SRXX-Y according to the VAC0-AC1 RF input voltage:

Figure 2. Typical tuning capacitance variation of M24LRXXE-R and M24SRXX-Y

VRF_min corresponds to the minimum RF voltage between AC0 and AC1 RF inputs of the

RFID memory chips. The corresponding tuning capacitance CS_VRF_min must be taken as

reference for antenna design: in other words, customers have to design antennas which

inductance satisfies the following relationship, showed by Equation 6:

Equation 6

Vdatasheet corresponds to the voltage level used for better correlation with measurements

in production.

ftun

M24SR

π LA CS

VRFmin

⋅

-------------------------------------------

→

VRFmin

⋅

--------------------------------

AN4409 데이터시트(PDF) 5 Page - STMicroelectronics