PI6LC4840 Datasheet, PDF (1/10 Pages) Pericom Semiconductor Corporation – Crystal to LVDS/LVCMOS Frequency Synthesizer

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 in-
tended 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+
QC0-
QC1+
QC1-
QC2+
QC2-
REF_Out
www.pericom.com
PS9076
01/03/11