MX439 Datasheet | CML

Features - 1200 Baud MSK Modem - Meets Cellular & Trunked Radio Specifications - Full-Duplex 1200 Baud - On-Chip RX and TX Bandpass Filters - Clock Recovery and Carrier Detect - Pin Selectable Xtal/Clock Frequencies Document #2048-0041.005 June 1995 Applications - Mobile & Cellular Radio Data Signaling - Personal Radio - Portable Data Terminals - General Purpose Applications AVAILABLE PACKAGES MX439LH 24-pin PLCC MX439DW 24-pin SOIC Figure 1 - Internal Block Diagram MX439J: 22 pin CDIP MX439P: 22 pin PDIP Brief Description The MX439 is a single-chip CMOS LSI circuit which operates as a 1200 baud MSK modem. The mark and space frequencies are 1200Hz and 1800Hz phase continuous, and the frequency transitions occur at the zero crossing point. The transmitter and receiver will work independently, thus providing full-duplex operation at 1200 baud. The baud rate, transmit mark and space frequencies, and the TX and RX synchronization...