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LT1671CMS8 Datasheet(PDF) 10 Page - Linear Technology |
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LT1671CMS8 Datasheet(HTML) 10 Page - Linear Technology |
10 / 12 page 10 LT1671 APPLICATIONS INFORMATION Crystal Oscillators Figure 7 shows a crystal oscillator circuit. In the circuit, the resistors at the LT1671’s positive input set a DC bias point. The 2k-0.068 µF path sets up phase shifted feedback and the circuit looks like a wideband unity-gain follower at DC. The crystal’s path provides resonant positive feedback and stable oscillation occurs. Figure 7. 1MHz to 10MHz Crystal Oscillator Figure 8. Switchable Output Crystal Oscillator. Biasing A or B High Places Associated Crystal in Feedback Path. Additional Crystal Branches Are Permissible – + LT1671 2k 5V 2k 1MHz TO 10MHz CRYSTAL (AT-CUT) 0.068 µF OUTPUT 1671 F07 2k 1671 F08 – + LT1671 1k 5V 1k 1k 75pF D1 OUTPUT B A LOGIC INPUTS AS MANY STAGES AS DESIRED XTAL A 1k RX XTAL B XTAL X D2 DX 2k = 1N4148 GROUND XTAL CASES Switchable Output Crystal Oscillator Figure 8 permits crystals to be electronically switched by logic commands. This circuit is similar to the previous examples, except that oscillation is only possible when one of the logic inputs is biased high. |
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