PI6LC4840

PI6LC4840 Crystal to LVDS/LVCMOS Frequency Synthesizer Features ÎÎ3.3V supply voltage ± 5% ÎÎThree banks of outputs: àà Bank A: 3 25/50MHz pin selectable LVCMOS outputs àà Bank B: 3 125MHz LVCMOS outputs àà Bank C: 3 125MHz LVDS outputs ÎÎ1 25MHz LVCMOS reference clock output (no PLL) ÎÎ25MHz crystal input (SaRonix-eCera P/N FL2500029) ÎÎLow 1ps max 12k-20MHz integrated phase noise design (for 125MHz CMOS and LVDS outputs) ÎÎIndustrial temperature -40°C to 85°C ÎÎPackage (Pb-free & Green) àà 32-contact 5x5mm TQFN (ZH) Description The PI6LC4840 is an LC VCO based low phase noise design intended for the most demanding Ethernet applications. Common Ethernet frequencies of 25MHz and 125MHz are supported, with the 125Mhz having both LVDS and LVCMOS outputs for maximum flexibility. One 25Mhz LVCMOS non-PLL output is also available. Block Diagram Mode [2:0] Mode_1 = Pull-up Mode_0,2 = Pull-down 3 Control Logic SaRonix-eCera FL2500029 25MHz X1 OSC X2 Phase Detector VCO \M MR Pull-down 10-0249 1 LVCMOS - 25MHz or 50MHz ÷20 or ÷10 CMOS - 125MHz ÷4 LVDS 125MHz ÷4 LVCMOS - 25MHz VDDO_QA QA0 QA1 QA2 VDDO_QB QB0 QB1 QB2 VDDO_QC QC0+ QC0QC1+ QC1QC2+ QC2- REF_Out www.pericom.com PS9076 01/03/11 Pin Configuration (32-contact TQFN) PI6LC4840 Crystal to LVDS/LVCMOS Frequency Synthesizer GND X2 X1 Mode_2 Mode_1 Mode_0 VDDA GND 32 31 30 29 28 27 26 25 VDDO_REF 1 REF_Out 2 GND 3 GND 4 QA0 5 QA1 6 QA2 7 VDDO_QA 8 24 VDDO_QC 23 QC222 QC2+ 21 QC120 QC1+ 19 QC018 QC0...