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ATA5428-PLUW Datasheet(PDF) 7 Page - ATMEL Corporation |
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ATA5428-PLUW Datasheet(HTML) 7 Page - ATMEL Corporation |
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7 / 97 page  7 4841D–WIRE–10/07 ATA5423/ATA5425/ATA5428/ATA5429 2. Application Circuits 2.1 Typical Remote Control Unit Application with 1 Li Battery (3V) Figure 2-1 shows a typical 433.92 MHz Remote Control Unit application with one battery. The external components are 11 capacitors, 1 resistor, 2 inductors and a crystal. C 1 to C4 are 68 nF voltage supply blocking capacitors. 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 C11 are RF matching capacitors in the range of 1 pF to 33 pF. L1 is a matching induc- tor of about 5.6 nH to 56 nH. L 2 is a feed inductor of about 120 nH. A load capacitor of 9 pF for the crystal is integrated. R 1 is typically 22 kΩ and sets the output power to about 5.5 dBm. The loop antenna’s quality factor is somewhat reduced by this application due to the quality factor of L 2 and the RX/TX switch. On the other hand, this lower quality factor is necessary to have a robust design with a bandwidth that is broad enough for production tolerances. Due to the sin- gle-ended and ground-referenced design, the loop antenna can be a free-form wire around the application as it is usually employed in remote control uni-directional systems. The ATA5423/ATA5425/ATA5428/ATA5429 provides sufficient isolation and robust pulling behavior of internal circuits from the supply voltage as well as an integrated VCO inductor to allow this. Since the efficiency of a loop antenna is proportional to the square of the surrounded area it is beneficial to have a large loop around the application board with a lower quality factor in order to relax the tolerance specification of the RF components and to get a high antenna efficiency in spite of their lower quality factor. Figure 2-1. Typical Remote Control Unit Application, 433.92 MHz, 1 Li Battery (3V) CS NC RSSI CDEM SCK DEM_OUT SDI_TMDI SDO_TMDO ATA5423/ATA5425 ATA5428/ATA5429 CLK VCC VSS Sensor VSINT XTAL2 + Lithium cell Loop antenna AVCC ATmega 48/88/168 13.25311 MHz N_RESET IRQ NC NC RF_IN C2 C7 C11 C6 C3 C1 C4 433_N868 NC NC NC RF_OUT PWR_H R_PWR NC NC C9 C10 R1 L2 L1 C8 C5 |
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