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ATA5823 Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATA5823 Datasheet(HTML) 9 Page - ATMEL Corporation |
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9 / 96 page  9 4829D–RKE–06/06 ATA5823/ATA5824 6. Typical Car Application for Full-duplex PEG Figure 6-1. Typical Car Application for Full-duplex PEG, 433.92 MHz Figure 6-1 shows a typical 433.92 MHz V CC = 4.4V to 5.25V PEG car application. The external components are 11 capacitors, 1 resistor, 3 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 capacitors for the internal voltage regulator. C5 is a 10 nF supply blocking capacitor. C 6 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 10 are RF matching capacitors in the range of 1 pF to 33 pF. L1 is a feed inductor of about 120 nH, L 2 and L3 are matching inductors to match the RX-antenna to the SAW and the SAW to RF_IN. A load capacitor of 9 pF for the crystal is integrated. C 11 is a 10 nF capacitor which is necessary to prevent that signals couple into the pin R_PWR, causing amplitude modulation of the output power and a spurious rise of the transmitted signal. R 1 and C11 should be placed close to the R_PWR pin. R 1 is typically 22 kΩ and SETPWR is programmed to get an output power of 0 dBm in full-duplex mode and 5 dBm in half-duplex mode. The quality factor of the TX-loop antenna is only reduced by the quality factor of L 1, the tolerances of C9 and C10 are thus important. Since the 2 Antennas are located at different places the isolation between RF_OUT and RF_IN is about 45 dB and the coupled output power from RF_OUT to RF_IN is about – 45 dBm. The receive Sensitivity in full-duplex mode is reduced from –106 dBm without coupled RF power at RF_IN to –102 dBm with –45 dBm coupled RF power at RF_IN. The use of SAW fil- ters in the full-duplex system is unsuitable due to the high group delay which desensitize the receiver. 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 V SS AVCC 50 Ω connector to RX antenna Microcontroller ATA5823/ATA5824 C 1 C 2 C 10 C 5 C 7 C 6 C 3 L 1 C 4 R 1 13.25311 MHz RFIN V CC = 4.4 V ... 5.25 V SAW filter L 3 L 2 C 8 433_N868 C 9 TX Loop antenna (located in the control unit) C 11 |
Similar Part No. - ATA5823_06 |
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Similar Description - ATA5823_06 |
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