The MX839 is a low power CMOS C peripheral device which provides digitally controlled calibration, trimming, and monitoring functions for PCS, cellular, LMR, wireless transceivers, and general purpose applications. Featuring a four input intelligent 10 bit A/D monitoring subsystem, an interrupt generator, three 8/10 bit DACs, and two variable attenuator functions, the MX839 automatically monitors, produces, and trims up to nine analog signals via a simple four wire serial control bus. The free running A/D intelligent monitoring subsystem includes independent high and low limit comparators for each of four analog input signals which can be configured to generate external C interrupts. The MX839's high level of integration reduces end product parts count, component size, and software complexity. MX839 digital trimming functions also reduce manufacturing costs by eliminating manual trimming operations. Featuring an operating range of 3.0V to 5.5V the MX839 is available in 24-pin SSOP (MX839DS), 24-pin SOIC (MX839DW), and 24-pin PDIP (MX839P) packages.