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DS4026-JCN Datasheet(PDF) 8 Page - Maxim Integrated Products |
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DS4026-JCN Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page 12.8MHz to 51.84MHz TCXO 8 _____________________________________________________________________ DS4026 TEMP SENSOR VCC VCC GND VOSC GNDOSC GNDD VREF VCCD FOUT GNDA SCL SDA I2C INTERFACE CONTROLLER DAC CMOS BUFFER A/D GND EEPROM ARRAY GND GND VCC VCC Figure 2. Functional Diagram Detailed Description The DS4026 is a TCXO capable of operating at 3.3V ±10%, and it allows digital tuning of the fundamental frequency. The device is calibrated in the factory to achieve an accuracy of ±1ppm over the industrial tem- perature range, and its minimum pullability is ±8ppm with a typical resolution of 1ppb (typ) per LSB. The DS4026 contains the following blocks: • Oscillator block with variable capacitor for compen- sation • Output driver block • Temperature sensor • Controller to read the temperature, control lookup table, and adjust the DAC input • DAC output to adjust the capacitive load •I2C interface to communicate with the chip The oscillator block consists of an amplifier and variable capacitor in a Pierce crystal oscillator with a crystal res- onator of fundamental mode. The oscillator amplifier is a single transistor amplifier and its transconductance is temperature compensated. The variable capacitor is adjusted by the DAC to provide temperature compen- sation. With the FTUNEH and FTUNEL registers, a mini- mum pullability of ±15ppm (typ) is achieved with a typical resolution of 1ppb (typ) per LSB. |
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