SM840002

SM840002 ClockWorks™ Dual 10-Gigabit/Gigabit Ethernet 62.5MHz, 125MHz, or 156.25MHz, Ultra-Low Jitter LVCMOS Clock Frequency Synthesizer General Description The SM840002 is a dual 10-Gigabit Ethernet and Gigabit Ethernet, 62.5MHz, 125MHz, or 156.25MHz LVCMOS clock frequency synthesizer and a member of the ClockWorks™ family of devices from Micrel. It provides a low-noise timing solution for high-speed, high-accuracy synthesis of clock signals. It includes a patented RotaryWave® architecture that provides a very stable clock with very-low noise. Power supplies of either 2.5V or 3.3V are supported, with superior jitter and phase-noise performance. The device synthesizes a 62.5MHz, 125MHz, or 156.25MHz, lownoise LVCMOS output pair for Ethernet applications. The crystal reference frequency is 25MHz. The SM840002 is an excellent replacement for IDT FemtoClocks®, with improved waveform integrity, and jitter. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features Generates two LVCMOS outputs Operating supply modes: − Core/Output − 3.3V/3.3V, 2.5V/2.5V Typical phase jitter @156.25MHz~64 fs (1.875MHz − 20MHz) Crystal frequency: 25MHz 62.5MHz, 125MHz, or 156.25MHz output frequency Output Skew: 12ps (maximum) Phase Noise @ 156.25MHz: − 1KHz: −126dBc/Hz − 10KHz: −130dBc/Hz − 100KHz: −126dBc/Hz − 1MHz: −139dBc/Hz − 10MHz: −165dBc/Hz − 20MHz: −166/dBc/Hz Temperature range: –40°C to +75°C Green-, RoHS-, and PFOS-compliant A...