XR-2120 Description
FUNCTIONAL BLOCK DIAGRAM The X R-2120 is a self-contained bandpass fi Iter set designed for realization of Bell 212A patible 1200 bits/sec PSK modems. The XR-2120 utilizes CMOS technology and switched capacitor circuit techniques to minimize external ponents to a single crystal or frequency source. Contained in the device are two plete bandpass filters centered around the Bell standard 1200 Hz and 2400 Hz send and...