General Description
The CMX808A is a programmable CTCSS Processor for Family Radio Service, see Figure 1.
The receiver of the CMX808A decodes a user-programmable set of up to 7 tones with minimum software intervention; the band-pass filter is designed to filter out the CTCSS sub-audio tones. A high-resolution tone encoder performs accurate generation of CTCSS tones.
Each function, and the routing of signals, is flexible and may be configured or controlled by the users software.

FEATUREs
• Rapid multi-tone CTCSS decoder supports new end user features
• Fast Tone Decode (150ms)
• Supports Tones from 62.5Hz to 251Hz
• Integrated 32 Step Digital Volume Control (-48.0dB to 0dB + Off)
• Tone Cloning Capabilities
• Sub-Audio Tone Rejection Filter
• Low Power 3.0V to 5.5V Operation
• Very small 20-pin TSSOP Package
• 4.0MHz Xtal/Clock Oscillator

APPLICATIONs
• Family Radio Service (FRS) Radios
• Amateur Radio Equipment
• General Mobile Radio Service (GMRS)
• Short Range Business Radio