The MC13109A integrates several of the functions required for a cordless telephone into a single integrated circuit. This significantly reduces component count, board space requirements, and external adjustments. It is designed for use in both the handset and the base.

• Dual Conversion FM Receiver
   – Complete Dual Conversion Receiver – Antenna Input to Audio Output 80 MHz Maximum Carrier Frequency
   – RSSI Output
   – Carrier Detect Output with Programmable Threshold
   – Comparator for Data Recovery
   – Operates with Either a Quad Coil or Ceramic Discriminator
• Compander
   – Expandor Includes Mute, Digital Volume Control and Speaker Driver
   – Compressor Includes Mute, ALC and Limiter
• Dual Universal Programmable PLL
   – Supports New 25 Channel U.S. Standard with No External Switches
   – Universal Design for Domestic and Foreign CT–0 Standards
   – Digitally Controlled Via a Serial Interface Port
   – Receive Side Includes 1st LO VCO, Phase Detector, and 14–Bit Programmable Counter and 2nd LO with 12–Bit Counter
   – Transmit Section Contains Phase Detector and 14–Bit Counter
   – MPU Clock Output Eliminates Need for MPU Crystal
• Supply Voltage Monitor
   – Externally Adjustable Trip Point
• 2.0 to 5.5 V Operation with One–Third the Power Consumption of Competing Devices