DESCRIPTION
This specification defines the requirements for a transmitter modulator and fractional–N synthesizer IC to be used in cellular telephones which employ the North American Dual Mode Cellular System (IS–136).

FEATURES
• Low current from 3.75V supply
• Low phase noise
• Main loop with internal charge pump and fractional compensation
• 3–line serial interface bus
• Power down for the synthesizers
• Speedup mode for faster switching

APPLICATIONS
• Cellular phones
• Portable battery–powered radio equipment.