sm840004-11 Micrel Semiconductor, sm840004-11 Datasheet
sm840004-11
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sm840004-11 Summary of contents
Page 1
... General Description The SM840004-11 clock synthesizer was designed for Gigabit Ethernet applications. The device design is optimized for 62.5MHz and 125MHz using a standard 25MHz fundamental parallel unparalleled stability and accuracy over the full operating range, and provides an easy fit for Jitter and Phase Noise standards for these high performance interfaces ...
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... Micrel, Inc. (1) Ordering Information Part Number SM840004-11KA SM840004-11KA TR Note: 1. Devices are Green, RoHS-compliant and PFOS-compliant. Pin Configuration Pin Description Pin Number Pin Name 1 F_SEL 2,3,4,6,7,9, DDA XTAL_OUT 12 XTAL_IN 13,19 GND DDO Configuration Table F_SEL ...
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... Condition V = 3.3V ± 2.5V ± 3.3V ± 2.5V ± 3.3V ± 2.5V ±5% DD Output Enable input Output Enable input FSEL input FSEL input 3 SM840004-11 (2) )............................. +2.375V to +3.465V IN ) .......................... –40°C to +85°C A ).....................................................113°C/W JA Min Typ Max 2.375 2.50 2.625 2.375 2.50 2.625 2.375 2.50 2.625 0 ...
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... Output Load AC Test Circuit 3.3V Carrier Frequency, 125MHz Unit Offset from Carrier dBc/Hz 100Hz dBc/Hz 1kHz dBc/Hz 10kHz dBc/Hz 100kHz dBc/Hz 1MHz dBc/Hz 1.825 dBc/Hz 10MHz dBc/Hz 20MHz 4 SM840004-11 Min Typ Max Units 125 MHz 62 356 fs 300 Measured Phase Noise ...
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... F_SEL pin, and the feedback divider is fixed at ÷130. improved and provides tight control and stability on this critical specification. specifications for Duty Cycle, Jitter, Phase Noise, Power Consumption, and noise sensitivity. Additionally, the SM840004-11 will operate at either 3.3V or 2.5V supplies. 5 hbwhelp@micrel.com SM840004-11 Units MHz Ω ...
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... Micrel, Inc. RMS Phase Noise/Jitter July 2010 Phase Noise Plot 125MHz @ 3.3V 6 SM840004-11 M9999-070110-A hbwhelp@micrel.com or (408) 955-1690 ...
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... Micrel, Inc. Switching Waveforms July 2010 Output Rise/Fall Time Output-Output Skew 7 SM840004-11 M9999-070110-A hbwhelp@micrel.com or (408) 955-1690 ...
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... Micrel, Inc. Power Supply Filtering The SM840004-11 provides separate power supply pins to isolate any high switching noise from outputs to internal core blocks. VDD and VDDA should be individually connected to the power plane through vias. Bypass capacitors should be used for each pin. Figure 2, illustrates how the power supply filter for 3 ...
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... Cb1 + Cd1) July 2010 Example 18pF 2pF 4pF Trim Cap = (18pF) - (2pF +4pF) = 30pF The SM840004-11has been characterized with 19.44MHz, 1 18pF parallel resonant crystal. The trim capacitors Ct1 and Ct2 were optimized to minimize the ppm error. (Ct2 + Cb2 + Cd2) To minimize the board capacitance, a short trace from pin to crystal footprint without vias is desirable ...
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... Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully July 2010 20-Pin TSSOP (K-20) indemnify Micrel for any damages resulting from such use or sale. © 2010 Micrel, Incorporated. 10 SM840004-11 M9999-070110-A hbwhelp@micrel.com or (408) 955-1690 ...