max2769cfcen配置使用指南

　　The MAX2769C is a global navigation satellite system （GNSS） receiver covering GPS， GLONASS， Galileo， and BeiDou navigation satellite systems on a single chip. This single-conversion GNSS receiver is designed to provide high performance for industrial applications， and a wide range of consumer applications， including mobile handsets. Filtering at IF is important as it limits the noise bandwidth and improves sensitivity while reducing interference. The MAX2769C‘s IF filtering is highly flexible. The Butterworth IF filter can be configured either as 3rd or 5th order， and bandpass or low pass as the application dictates. The center frequency is also programmable to match the selected IF. In bandpass mode， the （double-sided） 3dB bandwidths can be set to 2.5MHz， 4.2MHz or 9.66MHz. These bandwidths can also be used in low-pass mode. In lowpass mode， there is also the option of setting the double-sided filter bandwidth to 18MHz. Users can choose a design that optimizes performance for their application.