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LMX9820ASM Datasheet(PDF) 21 Page - National Semiconductor (TI) |
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LMX9820ASM Datasheet(HTML) 21 Page - National Semiconductor (TI) |
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21 / 44 page  Revision 1.0 21 www.national.com 8.0 Digital Smart Radio (Continued) Figure 12. Frequency Offset with 12 pF/12 pF Capacitors Figure 13. Frequency Offset with 10 pF/10 pF Capacitors 8.7.2 TCXO (Temperature Compensated Crystal Oscillator) The LMX9820A also can operate with an external TCXO (Temperature Compensated Crystal Oscillator). The TCXO signal is directly connected to the CLK+, shown in Table 23 on page 21. 1. Input Impedance The LMX9820A CLK+ pin has in input impedance of 2 pF capacitance in parallel with >400k Ω resistance. 2. NKG3184A TCXO The LMX9820A has also been tested with the NKG3184A TCXO. See Table 23 on page 21. Table 23. TCXO NKG3184A Specification Value Package 5.0 x 3.2 x 1.4 mm (4 pads) Frequency 12.000 MHz Stability 18 ppm at -30 to +85°C (inclusive of all conditions) Output Load 10k Ω/13 pF Current Consumption 2.0 mA Output Level 0.3Vp-p to 2.0Vp-p Storage Temperature -40 to +85°C DC Cut Capacitor Included in VC-TCXO |
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