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SM840002KA Scheda tecnica(PDF) 1 Page - Micrel Semiconductor |
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SM840002KA Scheda tecnica(HTML) 1 Page - Micrel Semiconductor |
1 / 9 page SM840002 ClockWorks ™ Dual 10-Gigabit/Gigabit Ethernet 62.5MHz, 125MHz, or 156.25MHz, Ultra-Low Jitter LVCMOS Clock Frequency Synthesizer ClockWorks is a trademark of Micrel, Inc. RotaryWave is a registered trademark of Multigig, Inc. FemtoClocks is a registered trademark of IDT, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 ( 408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com November 2010 M9999-110810-A hbwhelp@micrel.com or (408) 955-1690 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, low- noise 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 • Available in 16-pin TSSOP Applications • Gigabit Ethernet • 10-Gigabit Ethernet |
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