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CF5037B2 Datasheet(PDF) 3 Page - Nippon Precision Circuits Inc |
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CF5037B2 Datasheet(HTML) 3 Page - Nippon Precision Circuits Inc |
3 / 10 page CF5037 series SEIKO NPC CORPORATION —3 BLOCK DIAGRAM OSCILLATOR CIRCUIT CONSTANT The CF5037 series oscillator setting varies with device version to optimize characteristics over the recom- mended operating frequency range. Oscillator Equivalent Circuit Version Oscillation mode Built-in capacitance*1 *2[pF] *1. The oscillator internal capacitance values includes parasitic capacitance. *2. Values in parentheses ( ) are provisional only. Recommended operating frequency range*2 *3 [MHz] *3. The recommended operating frequency is a yardstick value derived from the crystal used for NPC characteristics authentication. How- ever, the oscillator frequency band is not guaranteed. Specifically, the characteristics can vary greatly due to crystal characteristics and mounting conditions, so the oscillation characteristics of components must be carefully evaluated. CXIN CXOUT CF5037A1 Fundamental or 3rd overtone 12 12 80 to 120 CF5037B × 8 8 100 to 180 CF5037C × 6 6 150 to 250 CF5037D × Fundamental 5 5 250 to 400 CF5037E × (5) (5) (400 to 600) CF5037F × (4) (4) (600 to 700) The CF5037 series oscillator circuit has a C0 cancel circuit built-in to improve the oscillator margin. If power is applied when there is an open circuit between XIN and XOUT, self oscillation may occur, which is not abnormal. Users should confirm that the oscillator operates normally when a crystal unit is connected. XIN VCC OE XOUT 1/2 OUT VCC2 GND OUTN LVDS Colpitts OSC XIN XOUT C0 cancel RPD1 CXOUT CXIN Rf Oscillator block equivalent circuit |
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