The MX829 is a low voltage CMOS integrated circuit, designed to provide baseband audio and system signal-processing functions required for LMR/PAMR/PMR trunked radio applications. The MX829 operates in half-duplex mode under the serial-bus control of a host C. The MX829 incorporates a dual-rate 1200/2400bps MSK modem, with a software-flexible choice of synchronization codewords, data run-length and CRC checking to suit a wide range of applications. These features allow very flexible handling of user defined data on traffic channels in addition to the network signaling sent on control channels. A 16 character DTMF encoder is available in the transmit mode. Software programmable output level-adjustment facilitates two-point modulation circuits. The audio processing stages include transmit and receive filtering (based on standards specified for 12.5kHz and 25kHz LMR/PAMR/PMR channel operation), transmit deviation limiting, and a programmable Rx volume control. Power saving is automatic when audio functions are disabled. The MX829 is designed for use in radios compatible with MPT1327, PAA1382 and ETS 300 086 Trunking Standards. The features and flexibility of the MX829 ensure that it is equally suitable for use with modified or proprietary standards. The MX829 is available in the following packages: 24-pin SSOP (MX829DS), 24-pin SOIC (MX829DW), and 24-pin PDIP (MX829P).