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ATA5824 Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATA5824 Datasheet(HTML) 7 Page - ATMEL Corporation |
7 / 96 page 7 4829D–RKE–06/06 ATA5823/ATA5824 4. Typical Car Application for Bi-directional RKE Figure 4-1. Typical Car Application for Bi-directional RKE with 10 dBm TX Power, 433.92 MHz Figure 4-1 shows a typical 433.92 MHz V CC = 4.4V to 5.25V RKE car application. The external components are 11 capacitors, 1 resistor, 4 inductors, a SAW filter and a crystal. C 1, C3 and C4 are 68 nF voltage supply blocking capacitors. C 2 is a 2.2 µF supply blocking capacitor for the internal voltage regulator. C 5 is a 10 nF supply blocking capacitor. C6 is a 15 nF fixed capacitor used for the internal quasi-peak detector and for the high-pass frequency of the data filter. C 7 to C 11 are RF matching capacitors in the range of 1 pF to 33 pF. L2 to L4 are matching inductors of about 5.6 nH to 56 nH. A load capacitor for the crystal of 9 pF is integrated. R 1 is typically 22 kΩ and sets the output power at RF OUT to about 10 dBm. Since a quarter wave or PCB antenna, which has high efficiency and wideband operation, is typically used here, it is recommended to use a SAW filter to achieve high sensitivity in case of powerful out-of-band blockers. L 1, C10 and C 9 together form a low-pass filter, which is needed to filter out the harmonics in the transmitted signal to meet regulations. VSINT POUT XTAL2 CLK TEST3 IRQ RSSI CDEM CS SCK SDI_TMDI SDO_TMDO RF_IN NC NC R_PWR RF_OUT PWR_H NC NC NC NC NC NC VCC VSS AVCC 50 Ω connector Microcontroller ATA5823/ATA5824 C 1 C 2 C 9 C 8 C 10 C 5 C 7 C 6 C 3 L 2 C 4 R 1 13.25311 MHz RF OUT V CC = 4.4 V ... 5.25 V SAW filter L 1 L 3 L 4 C 11 433_N868 |
Similar Part No. - ATA5824 |
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Similar Description - ATA5824 |
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