The MX589 is a single-chip synchronous modem designed for Wireless Data Applications. Employing Gaussian Minimum shift Keying (GMSK) baseband modulation, the MX589 features a wide range of available data rates: 4k to 64kbps. Data Rates and the choice of BT (0.3 or 0.5) are pin programmable to provide for different system requirements. The Tx and Rx digital data interfaces are bit serial, synchronized to Tx and Rx data clocks generated by the modem. Separate Tx and Rx Powersave inputs allow full or half-duplex operation. Rx input levels can be set by suitable AC and DC level adjusting circuitry built with external components around an on-chip Rx Input Amplifier.