 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATA5824-PLQW Datasheet(PDF) 8 Page - ATMEL Corporation |
|
||||||||||||||||||||||||||||||
ATA5824-PLQW Datasheet(HTML) 8 Page - ATMEL Corporation |
|
|
8 / 96 page  8 4829D–RKE–06/06 ATA5823/ATA5824 5. Typical Key Fob Application for Full-duplex PEG Figure 5-1. Typical Key Fob Application for Full-duplex PEG, 433.92 MHz Figure 5-1 shows a typical 433.92 MHz PEG key fob application. The external components are 10 capacitors, 1 resistor, 1 inductor and a crystal. C 1 to C3 are 68 nF voltage supply blocking capacitors. C 7 is a 10 nF supply blocking capacitor. C4 is a 15 nF fixed capacitor used for the internal quasi-peak detector and for the high-pass frequency of the data filter. C 5, C6, C8 and C9 are RF matching capacitors in the range of 1 pF to 33 pF. L 2 is a feed inductor of about 120 nH. C 10 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 C10 should be placed close to the R_PWR pin. A load capacitor of 9 pF for the crystal is integrated. R 1 is typically 22 kΩ and SETPWR is programmed to get an output power of –7 dBm in full-duplex mode and 5 dBm in half-duplex mode. The quality factor of the loop antenna 1 is only reduced by the quality factor of L 2, the tolerances of C9 and C8 are thus important. The qual- ity factor of the loop antenna 2 is reduced to half due to the loading with the input impedance of RF_IN. With well designed loop antennas and the correct degree of overlapping, the isolation between RF_OUT and RF_IN is about 28 dB and the coupled output power from RF_OUT to RF_IN is about –35 dBm. The decoupling of two loop antennas situated close to each other is due to the effect that the magnetic flux from the part of loop antenna 1 that does not overlap and that of the overlapping part has an opposite direction. Depending on the relative position between the two antennas, a decoupling of 28 dB is achievable. Due to additional capacitive coupling between the loops the position of the components C 5, C6 and C8, C9 are also important. The receive Sensitivity in full-duplex mode is reduced from –106 dBm without coupled RF-Power at RF_IN to –96 dBm with –35 dBm coupled RF power at RF_IN. VSINT POUT XTAL2 CLK TEST3 IRQ RSSI CDEM CS SCK SDI_TMDI SDO_TMDO RF_IN NC NC R_PWR RF_OUT 433_N868 PWR_H NC NC NC NC NC NC VCC VSS AVCC Loop antenna 1 Microcontroller ATA5823/ATA5824 Litihum-cell C 1 C 7 C 6 C 4 C 3 + L 2 C 2 R 1 13.25311 MHz Loop antenna 2 C 5 20% overlap C 10 C 8 C 9 |
Similar Part No. - ATA5824-PLQW |
|
Similar Description - ATA5824-PLQW |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.NET |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
