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DS1090U-2 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS1090U-2 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 8 page Low-Frequency, Spread-Spectrum EconOscillator Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2004 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. is a registered trademark of Dallas Semiconductor Corporation. Dither Percentage Settings Dither amplitude (measured in percent ± from the mas- ter oscillator center frequency) is set using input pins J0 and J1. This circuit uses a sense current from the master oscillator bias circuit to adjust the amplitude of the triangle-wave signal to a voltage level that modu- lates the master oscillator to a percentage of its resis- tor-set center frequency. This percentage is set in the end application to be 0%, 2%, 4%, or 8% (see Table 2). Application Information Pin Connection The DS1090 is intended to provide a fixed-frequency, dithered clock to be used as a clock driver for DC-DC converters and other applications requiring a low- frequency EMI-reduced clock oscillator. All control pins must be biased per Tables 1 and 2 for proper operation for the individual application’s requirements. RSET must be tied to ground (GND) by a customer-supplied resistor. RSET Resistor Selection The value of the resistor used to select the desired fre- quency is calculated using the formula in the Master Oscillator section (see also Figure 1). It is recommended to use, at minimum, a 1%-tolerance, 1/16th-watt compo- nent with a temperature coefficient that satisfies the over- all stability requirements desired of the end-equipment. Place the external RSET resistor as close as possible to minimize lead inductance. Power-Supply Decoupling To achieve best results, it is highly recommended that a decoupling capacitor is used on the IC power-supply pins. Typical values of decoupling capacitors are 0.01µF and 0.1µF. Use a high-quality, ceramic, surface-mount capacitor, and mount it as close as possible to the VCC and GND pins of the IC to minimize lead inductance. J1 J0 DITHER PERCENT (%) 00 0 01 2 10 4 11 8 Table 2. Dither Percentage Setting Package Information For the latest package outline information, go to www.maxim-ic.com/DallasPackInfo. Chip Information TRANSISTOR COUNT: 1883 SUBSTRATE CONNECTED TO GROUND |
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