Modem and rf chips, application processor including the same and operating method thereof

An application processor comprising:

• a central processing unit (CPU);
• a memory configured to store programs that are executable by the CPU;
• and
• a modem comprising a digital interface for communication with a radio frequency (RF) chip outside the application processor and a logic block for processing samples transmitted through the digital interface, wherein
• the samples are transmitted from the digital interface to the logic block in synchronization with a frame synchronization signal generated based on a clock signal in the modem.

A radio frequency (RF) chip for communicating with modem chip, the RF chip comprising:

• a logic block configured to perform logic processing on data to be transmitted to the modem chip;
• and
• a digital interface configured to transmit the data including a plurality of samples to the modem chip, based on digital communication,
• wherein the RF chip receives control information from the modem chip through the digital interface, and
• wherein a frequency of a clock signal generated in the RF chip is adjusted based on the received control information.