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LT1721IGN Datasheet(PDF) 16 Page - Linear Technology |
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LT1721IGN Datasheet(HTML) 16 Page - Linear Technology |
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16 / 28 page  LT1720/LT1721 16 17201fc The circuit in Figure 9 shows a crystal oscillator circuit that generates two nonoverlapping clocks by making full use of the two independent comparators of the LT1720. C1 oscillates as before, but with a lower reference level, C2’s output will toggle at different times. The resistors set the degree of separation between the output’s high pulses. With the values shown, each output has a 44% high and 56% low duty cycle, sufficient to allow 2ns between the high pulses. Figure 10 shows the two outputs. APPLICATIONS INFORMATION The optional A1 feedback network shown can be used to force identical output duty cycles. The steady state duty cycles of both outputs will be 44%. Note, though, that the addition of this network only adjusts the percentage of time each output is high to be the same, which can be important in switching circuits requiring identical settling times. It cannot adjust the relative phases between the two outputs to be exactly 180° apart, because the signal at the input node driven by the crystal is not a pure sinusoid. Figure 8. Timing Skew of Figure 7’s Circuit SUPPLY VOLTAGE (V) 2.5 4.5 6.0 1000 800 600 400 200 0 1720/21 F08 3.5 5.5 3.0 4.0 5.0 Figure 10. Nonoverlapping Outputs of Figure 9’s Circuit Figure 9. Crystal-Based Nonoverlapping 10MHz Clock Generator – + – + – + C1 1/2 LT1720 C2 1/2 LT1720 A1 LT1636 VCC 2.7V TO 6V 2k 620Ω 220Ω 10MHz CRYSTAL (AT-CUT) 100k 100k 2.2k 1.3k 2k 1k 17201 F09 0.1μF 0.1μF 0.1μF OUTPUT 0 OUTPUT 1 GROUND CASE OPTIONAL— SEE TEXT 20ns/DIV Q1 2V/DIV Q0 2V/DIV 17201 F10 |
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