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LMX2581EVM Datasheet(PDF) 11 Page - Texas Instruments |
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LMX2581EVM Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 46 page  LMX2581 OSCin Out+ Out- 0.1 F 0.1 F VccAux 18 R13 DNP 1µF C1 0 R5 DNP 1 MUXout 142-0701-851 DNP 2 3 4 5 OSCin 142-0701-851 10 R6 VccPlane 330 R33 DNP MUXout_TP DNP 100pF C109 DNP MUXout_uWire Y1 is for a XO, but has accomodations also for VCXOs as well. 0 R34 DNP GND_OSC GND_OSC GND_OSC GND_OSC CLK 120 ohm L3 47 R14 18 R15 33 R16 Green D1 DNP VCC 4 E/D 1 GND 2 OUT 3 100MHz Y1 CWX813-100.0M CLK 1 0 R21 0 R20 VccPlane 100pF C9 0 R18 100pF C8 0 R17 100pF C110 DNP VccPlane www.ti.com Board Construction 3.3 Comments and Recommendations for Evaluation Board Schematic OSCin Input The OSCin input has components of a series 47 Ω, shunt 18 Ω, and series 33 Ω, followed by a DC blocker capacitor. This divides down the CMOS output level of the XO and also makes the impedance as seen from the OSCin pin looking out to be about 50 Ω. The OSCin input can also be driven by the OSCin SMA. To do this, remove R6 and R14; change R13, R15, and L3 to 0 Ω; and make R15 51 Ω. Note that if L3 is not changed and left as a ferrite bead, this can create degraded performance when used with an external signal generator. Figure 9. OSCin Input Diagram Complementary OSCin Input Recommendation When the OSCin trace is differential, the approach shown in Figure 10 can also be used to convert it for the single-ended input of the LMX2581. This circuit makes impedance seen from the LMX2581 OSCin pin looking out to be 50 Ω as well as the termination for the differential trace to be 100 Ω. Note that only one side of the 100 Ω differential trace can be grounded or it will change the desired 100 Ω termination for the differential trace. Figure 10. Complementary OSCin Input Recommendation Diagram 11 SNAU136C – November 2012 – Revised November 2013 LMX2581EVM User's Guide Submit Documentation Feedback Copyright © 2012–2013, Texas Instruments Incorporated |
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