Electronic Components Datasheet Search |
|
ACS8946 Datasheet(PDF) 11 Page - Semtech Corporation |
|
ACS8946 Datasheet(HTML) 11 Page - Semtech Corporation |
11 / 40 page ADVANCED COMMUNICATIONS FINAL DATASHEET Revision 3/November 2006 © Semtech Corp. Page 11 www.semtech.com ACS8946 JAM PLL Characteristic is defined solely by the loop filter bandwidth and is shown in Figure 5, which shows the transfer characteristic using the recommended loop filter bandwidth of 2 kHz with a damping factor of 1.2. Figure 5 Jitter Transfer Characteristic, ACS8946 Stand-alone In the combined solution, the ACS8525 device provides additional low frequency jitter filtering. The Jitter Transfer Characteristic of the combined ACS8946 and ACS8525 is shown in Figure 6. Figure 6 Jitter Transfer Characteristic, ACS8525 and ACS8946 combined Phase Noise Performance The inherent jitter generation by the ACS8946 is shown in the phase noise plot in Figure 7 measured on a 155.52 MHz output clock using an input reference of 19.44 MHz. Figure 7 Phase Noise Offset from Carrier of ACS8946 622.08 MHz output clock In the combined line card solution, the inherent jitter generated by the ACS8525 is attenuated by the ACS8946 as shown in the phase noise plot in Figure 8. Figure 8 Phase Noise Offset from Carrier, ACS8525 155.52 MHz output clock, with and without ACS8946 Clock Cleaner Lock Detector A simple lock detector is incorporated which combines the plus and minus phase errors from the phase detector, TBIL ACS8944 RMS Jitter Transfer Curve -27.0 -24.0 -21.0 -18.0 -15.0 -12.0 -9.0 -6.0 -3.0 0.0 3.0 100 1000 10000 100000 Frequency (Hz) ACS8946 RMS Jitter Transfer Curve TBIL -160 -140 -120 -100 -80 -60 -40 -20 0 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 Frequency (Hz) Typical Phase Noise @ 155.52MHz TBIL Typical Phase Noise Cleaning of ACS8525 -170 -150 -130 -110 -90 -70 -50 -30 -10 1.0E+02 1.0E+03 1.0E+04 1.0E+05 1.0E+06 1.0E+07 1.0E+08 Frequency (Hz) ACS8525 alone ACS8525 + ACS8946 |
Similar Part No. - ACS8946 |
|
Similar Description - ACS8946 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | 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 |