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DS1099U-AOA1 Datasheet(PDF) 5 Page - Maxim Integrated Products |
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DS1099U-AOA1 Datasheet(HTML) 5 Page - Maxim Integrated Products |
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5 / 7 page  Detailed Description The DS1099 consists of a fixed-frequency 1.048MHz master oscillator followed by two independent facto- ry-programmable dividers. The two divider outputs are connected to pins OUT0 and OUT1, which are independently enabled/disabled using the output-enable pins, OE0 and OE1, respectively. When the output-en- able pins are active (low), the corresponding outputs are enabled. If either output-enable pin is tied to its inactive state (high), then the corresponding output is disabled and forced high immediately. The output- enable pins only disable the corresponding output driver(s) and do not shut down the master oscillator or the dividers. Since the master oscillator frequency, fMOSC, is fixed, the frequency of OUT0 and OUT1 is determined by DIVIDER 0 and DIVIDER 1, respectively. And since each output has its own divider, fOUT0 and fOUT1 can be programmed independent of each other. The frequency of the outputs are calculated as follows: fOUT0 = fMOSC/2X0 = 1.048MHz/2X0 fOUT1 = fMOSC/2X1 = 1.048MHz/2X1 where X0 is the DIVIDER 0 setting and X1 is the DIVIDER 1 setting. Valid values for X0 and X1 are integers 0 to 22 (dec). Table 1 shows output frequencies and divider values for the range of divider settings. Table 1. Divider Settings and Output Frequencies DIVIDER SETTING X0 OR X1 DIVISOR fOUT0 OR fOUT1 0 1 1.048MHz 1 2 0.524MHz 2 4 0.262MHz 3 8 0.131MHz 4 16 65.50kHz 5 32 32.75kHz — — — 19 524,288 2Hz 20 1,048,576 1Hz 21 2,097,152 0.5Hz 22 4,194,304 0.25Hz GND MASTER OSCILLATOR 1.048MHz DIVIDER 0 DIVIDE BY 2X (X = X0 = 0...22) DIVIDER 1 DIVIDE BY 2X (X = X1 = 0...22) VCC VCC OE1 OE0 OUT0 OUT1 fOUT0 fOUT1 fMOSC FACTORY- PROGRAMMED EEPROM OUTPUT DRIVER OUTPUT DRIVER DS1099 Functional Diagram DS1099 Low-Frequency Dual EconOscillator www.maximintegrated.com Maxim Integrated │ 5 |
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