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SM840051KA датащи(PDF) 5 Page - Micrel Semiconductor |
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SM840051KA датащи(HTML) 5 Page - Micrel Semiconductor |
5 / 10 page Micrel, Inc. SM840051 May 2010 5 M9999-050710-C hbwhelp@micrel.com or (408) 955-1690 Functional Description The SM840051 synthesizer provides a high performance solution to frequency generation. Low cost crystals of 20.141601MHz, 19.53125MHz, and 19.44MHz are used to provide low jitter output clocks of 161.132MHz, 156.25MHz , and 155.52MHz, respectively. A single LVCMOS output, capable of driving a 50 ohm load, is provided, which may be tri-stated by the OE input. The design of the SM840051 consumes very low power in the PLL due to a patented technology in the VCO and the associated dividers. The VCO range is ~3.2GHz to 3.5GHz providing high resolution and easy integer divide ratios. Output Divider ratios are fixed at either ÷20 or ÷40 controlled via the FSEL pin, and the feedback divider also fixed at ÷160. Duty Cycle is inherently improved and guarantees tight control and stability on this critical specification. This provides improved specifications for Duty Cycle, Jitter, Phase Noise, Power Consumption, and noise sensitivity. Additionally, the SM840051 will operate at either 3.3V or 2.5V supplies. RMS Phase Noise/Jitter Phase Noise Plot: 156.25MHz @ 3.3V Offset Frequency ( Hz) RMS Phase Jitter (Random) 1.875MHz to 20MHz = 58 fs (typical) Noise Power dBc/Hz (Random) 1.875MHz to 20MHz |
Аналогичный номер детали - SM840051KA |
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Аналогичное описание - SM840051KA |
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