DESCRIPTION
There are four internal PLLs, each individually programmable, allowing for up to eight differrent output frequencies. An additional 32kHz crystal oscillator is available to provide a real time clock or non-critical performance MHz processor clock. The IDT5P49EE801 can be programmed through the use of the I2C interfaces. The programming interface enables the device to be programmed when it is in normal operation or what is commonly known as in system programmable. An internal EEPROM allows the user to save and restore the configuration of the device without having to reprogram it on power-up. Each of the four PLLs has an 8-bit reference divider and a 11-bit feedback divider. This allows the user to generate four unique non-integer-related frequencies. The PLL loop bandwidth is programmable to allow the user to tailor the PLL response to the application. For instance, the user can tune the PLL parameters to minimize jitter generation or to maximize jitter attenuation. Spread spectrum generation is supported on one of the PLLs.
Integrated Device Technology
