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)