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P2779AG-08-TR Datasheet(PDF) 3 Page - ON Semiconductor |
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P2779AG-08-TR Datasheet(HTML) 3 Page - ON Semiconductor |
3 / 7 page P2779A http://onsemi.com 3 Loop Filter Selection Table VDD 3.3 V C1 C2 R1 Pin 4 LF Table 3. LOOP FILTER SELECTION TABLE VDD 3.3 V (Note 2) Input (MHz) FS1 FS0 BW = +0.50% BW = +0.75% BW = +1.00% BW = +1.25% C1 (pF) C2 (pF) R1 (W) C1 (pF) C2 (pF) R1 (W) C1 (pF) C2 (pF) R1 (W) C1 (pF) C2 (pF) R1 (W) 20 1 0 270 100,000 330 270 100,000 560 270 100,000 750 560 100,000 910 21−22 1 0 270 100,000 390 270 100,000 620 270 100,000 866(1%) 560 100,000 1,100 23−24 1 0 270 100,000 510 270 100,000 750 270 10,000 1,000 680 6,800 1,200 25−26 1 0 270 100,000 560 270 100,000 820 270 12,000 1,200 470 4,700 1,200 27−28 1 0 270 100,000 620 270 100,000 1,000 270 6,800 1,200 330 3,300 1,200 29−30 1 0 270 100,000 750 270 100,000 1,100 270 3,900 1,200 330 3,300 1,500 31−32 1 0 270 100,000 820 270 100,000 1,200 270 12,000 2,200 680 6,800 2,200 33−34 1 0 270 100,000 910 270 100,000 1,300 270 10,000 2,200 390 3,900 2,200 35−36 1 0 270 100,000 1,000 270 100,000 1,500 270 5,600 2,200 270 2,700 2,200 37−38 1 0 270 100,000 1,200 270 100,000 1,600 270 3,300 2,200 270 2,700 2,700 2. Please contact factory for loop filter values if desired spread settings are not listed. Spread Spectrum Selection The P2779A performs zero cycle slip when set at low percentage spreading. This prevents any occurrence of system timing error. The optimal setting should minimize system EMI to the fullest without affecting system performance. The spreading is described as a percentage deviation of the center frequency. (Note that the center frequency is the frequency of the external reference input on XIN / CLKIN, pin 1.) The P2779A is designed for PC peripheral, networking, notebook PC, and LCD monitor applications. It is optimized for operation from 20 MHz to 38 MHz. The P2779A’s spread percentage selection is determined by the external LF value specified in the Loop Filter Selection Table. The external LF allows the user to fine tune the spread percentage to optimize the EMI reduction benefits of the spread spectrum. Figure 2. Application Schematic PD selection: Power dissipation can be reduced by completely turning off the IC. Modulated 27 MHz +3.3 V 27 MHz C1 C2 R1 VDD VDD REF ModOUT VSS P2779A 8 7 6 5 0.1 mF LF PD 1 2 3 4 XOUT XIN / CLKIN |
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Similar Description - P2779AG-08-TR |
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