Universal Cordless Telephone Subsystem IC  

The MC13109 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–1 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
• AN1575: Refer to Application Note for a List of “Worldwide Cordless Telephone Frequencies” (Chapter 8 Addendum of DL128 Data Book)