 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
ATA5428 Datasheet(PDF) 11 Page - ATMEL Corporation |
|
||||||||||||||||||||||||||||||
ATA5428 Datasheet(HTML) 11 Page - ATMEL Corporation |
|
|
11 / 97 page  11 4841D–WIRE–10/07 ATA5423/ATA5425/ATA5428/ATA5429 A low-IF architecture is also less sensitive to second-order intermodulation (IIP2) than direct conversion receivers, where every pulse or AM-modulated signal (especially the signals from TDMA systems like GSM) demodulates to the receiving signal band at second-order non-linearities. Note: –120 dBC/Hz at ±1 MHz and –75 dBC at ±FREF at 433.92 MHz 3.2 Input Matching at RF_IN The measured input impedances as well as the values of a parallel equivalent circuit of these impedances can be seen in Table 3-1. The highest sensitivity is achieved with power matching of these impedances to the source impedance of 50 Ω The matching of the LNA Input to 50 Ω was done with the circuit shown in Figure 3-1 and with the values given in Table 3-2 on page 12. The reflection coefficients were always ≤10 dB. Note that value changes of C 1 and L1 may be necessary to compensate for individual board layouts. The measured typical FSK and ASK Manchester code sensitivities with a Bit Error Rate (BER) of 10-3 are shown in Table 3-3 and Table 3-4 on page 12. These measurements were done with induc- tors having a quality factor according to Table 3-2, resulting in estimated matching losses of 0.8 dB at 315 MHz, 0.8 dB at 345 MHz, 0.7 dB at 433.92 MHz, 0.7 dB at 868.3 MHz and 0.7 at 915 MHz. These losses can be estimated when calculating the parallel equivalent resistance of the inductor with R loss =2 ×π × f × L × QL and the matching loss with 10 log(1 + Rp/Rloss). With an ideal inductor, for example, the sensitivity at 433.92 MHz/FSK/20 Kbit/s/ ±16 kHz/Manchester can be improved from –106 dBm to –106.7 dBm. The sensitivity depends on the control logic which examines the incoming data stream. The examination limits must be programmed in control registers 5 and 6. The measurements in Table 3-3 and Table 3-4 on page 12 are based on the values of registers 5 and 6 according to Table 9-3 on page 61. Figure 3-1. Input Matching to 50 Ω Table 3-1. Measured Input Impedances of the RF_IN Pin fRF/MHz Z(RF_IN) Rp//Cp 315 (44 -j233) Ω 1278 Ω//2.1 pF 345 (40 -j211) Ω 1153 Ω//2.1 pF 433.92 (32 -j169) Ω 925 Ω//2.1 pF 868.3 (21 -j78) Ω 311 Ω//2.2 pF 915 (18 -j70) Ω 290 Ω//2.3 pF L1 C1 4 RF_IN ATA5423/ATA5425 ATA5428/ATA5429 |
Similar Part No. - ATA5428 |
|
Similar Description - ATA5428 |
|
|
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
