The CMX808A is a programmable CTCSS encoder/decoder optimized for Family Radio Service transceivers through a combination of leading edge performance, low cost, small size, and low power. With rapid response time and the ability to decode one-of-many possible tones, the decoder enables practical tone scanning to allow an FRS radio to quickly decode received CTCSS tones by 'listening' to the CTCSS tone transmissions of other FRS radios. This feature can be used to: 1. Readily support both individual (one person) and group (e.g. children vs. adults) call codes. 2. Support quick and automatic resolution of radio user frustration caused by mismatched CTCSS tone configurations in CTCSS-based FRS radios. In some cases, this approach can be used to match CTCSS tone decoder configurations to different vendors' CTCSS-based FRS radios when supported tone sets are not clearly documented or well understood. With integrated digital volume control and a simple serial control interface, the CMX808A features very low power consumption and small size. The CMX808A requires a 3.0V to 5.5V power supply and is available in the following packages: 20-pin TSSOP (CMX808AE3) and 24-pin PDIP (CMX808AP4).