Produktbeskrivning
Clock Gen 2 click is an accurate square wave generator that can generate a clock signal in the range from 260kHz to 66.6MHz. It generates a square wave in the frequency of 66.6MHz, which is then processed by the prescaler, which can be set in the range from 20 up to 28. This allows the full frequency range to be achieved on the output. The DS1087L, a 3.3V spread-spectrum EconOscillator, used on the Clock Gen 2 click, offers the spread-spectrum function, which can be controlled via the IC pin and register setting. This allows reduced EMI, especially on the high frequencies. Finally, the DS1087L offers a NV memory (EEPROM), which is used for storing the values of the configuration registers.
Equipped with the NV memory, synchronous Output Enable and Power Down function, clock prescaler, spread-spectrum options for reducing EMI radiation, the high-quality SMA connector, and an industry-standard I2C communication interface, the Clock Gen 2 click can be used for development and evaluation of various applications that require a reliable and EMI-free clock signal. It can be especially useful when building applications that allow switching of the main MCU, eliminating the need to equip every MCU with its own clock signal generator.
SPREAD-SPECTRUM DITHERING
Since all the digital signals within a device are synchronous, the high-frequency harmonics generated on the edges of these digital impulses are adding up, resulting with a very large narrow-band peak signal, that can easily exceed the acceptable level. To avoid this, a technique called spread-spectrum dither is employed, which slightly changes the clock rate over time, broadening the harmonics frequency band, preventing all the digital signals and their harmonics within the circuit to resonate (add-up) and cause considerably large EMI. There are several types of spread-spectrum dithering, depending on the frequency modulation waveform, as well as the modulation range and offset.
Equipped with the NV memory, synchronous Output Enable and Power Down function, clock prescaler, spread-spectrum options for reducing EMI radiation, the high-quality SMA connector, and an industry-standard I2C communication interface, the Clock Gen 2 click can be used for development and evaluation of various applications that require a reliable and EMI-free clock signal. It can be especially useful when building applications that allow switching of the main MCU, eliminating the need to equip every MCU with its own clock signal generator.
SPREAD-SPECTRUM DITHERING
Since all the digital signals within a device are synchronous, the high-frequency harmonics generated on the edges of these digital impulses are adding up, resulting with a very large narrow-band peak signal, that can easily exceed the acceptable level. To avoid this, a technique called spread-spectrum dither is employed, which slightly changes the clock rate over time, broadening the harmonics frequency band, preventing all the digital signals and their harmonics within the circuit to resonate (add-up) and cause considerably large EMI. There are several types of spread-spectrum dithering, depending on the frequency modulation waveform, as well as the modulation range and offset.