ICS810251I

VCXO and Synchronous Ethernet Jitter Attenuator ICS810251I DATA SHEET General Description The ICS810251I is a high performance, low jitter/low phase noise VCXO. The ICS810251i uses a low frequency and low cost pullable crystal to achieve jitter attenuation for synchronous Ethernet applications. The ICS810251I can take an input of either 25MHz or 125MHz and produce a single LVCMOS output of 25MHz. The device is packaged in a small 16 lead TSSOP package and is ideal for use on space constrained boards typically encountered in most synchronous ethernet applications. Features One single-ended output (LVCMOS or LVTTL levels), output Impedance: 15 Phase jitter attenuation by the VCXO-PLL using a 25MHz pullable external crystal (XTAL) Input frequencies: 25MHz or 125MHz Output frequency: 25MHz PLL loop bandwidth adjustable by external components 25MHz or 125MHz auto input frequency detect Full 3.3V or 2.5V supply voltage -40°C to 85°C ambient operating temperature Available in lead-free (RoHS 6) package Applications Synchronous Ethernet v0.39a End equipment compliant with Std IEEE 802.039a Block Diagram XTAL_OUT XTAL_IN (External loop filter inputs.) LF1 LF0 Pin Assignment PLL_SEL GND Reserved Q VDDO OE V DDA V DD PLL_SEL 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CLK_IN V DD LF1 LF0 GND XTAL_IN XTAL_OUT GND OE 25MHz (25MHz or 125MHz input frequency auto detect) CLK_IN Predivider PFD CP VCXO ICS810251I 1 0 Q 25MHz (÷1 or ÷5) VCXO-PLL 16-Lead TSSOP 4...