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LRIS2K 数据表(PDF) 90 Page - STMicroelectronics |
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LRIS2K 数据表(HTML) 90 Page - STMicroelectronics |
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90 / 102 page  DC and AC parameters LRIS2K 90/102 46 DC and AC parameters This section summarizes the operating and measurement conditions, and the DC and AC characteristics of the device. The parameters in the DC and AC Characteristic tables that follow are derived from tests performed under the Measurement Conditions summarized in the relevant tables. Designers should check that the operating conditions in their circuit match the measurement conditions when relying on the quoted parameters. Table 92. AC characteristics(1) (2) 1. TA = –20 to 85 °C. 2. All timing measurements were performed on a reference antenna with the following characteristics: External size: 75 mm x 48 mm Number of turns: 6 Width of conductor: 1 mm Space between 2 conductors: 0.4 mm Value of the tuning capacitor: 28.5 pF (LRIS2K-W4) Value of the coil: 4.3 µH Tuning frequency: 13.8 MHz. Symbol Parameter Condition Min Typ Max Unit fCC External RF signal frequency 13.553 13.56 13.567 MHz MICARRIER 10% carrier modulation index MI=(A-B)/(A+B) 10 30 % tRFR,tRFF 10% rise and fall time 0.5 3.0 µs tRFSBL 10% minimum pulse width for bit 7.1 9.44 µs MICARRIER 100% carrier modulation index MI=(A-B)/(A+B) 95 100 % tRFR,tRFF 100% rise and fall time 0.5 3.5 µs tRFSBL 100% minimum pulse width for bit 7.1 9.44 µs tJIT Bit pulse jitter -2 +2 µs tMIN CD Minimum time from carrier generation to first data From H-field min 0.1 1 ms fSH Subcarrier frequency high FCC/32 423.75 KHz fSL Subcarrier frequency low FCC/28 484.28 KHz t1 Time for LRIS2K response 4224/FS 318.6 320.9 323.3 µs t2 Time between commands 4224/FS 309 311.5 314 µs tW Programming time 5.8 ms |
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