900 MHz Analog Cordless Phone Baseband with Compander

The MC33411 900 MHz Analog Cordless Phone Baseband system is designed to fit the requirements of a 900 MHz analog cordless telephone system. Included are three PLLs (Phase–Locked Loops). Two are intended for use with external VCOs and 64/65 or 128/129 dual modulus prescalers, and can control the transmit and receive (LO1) frequencies for 900 MHz communication.

• Complete Expander/Compressor for Superior Noise Rejection

• Two PLLs and a LO Suitable for a 900 MHz System

• Minimal External Components

• Transmit Path Includes Adjustable Gain Amplifier, Filters, Mute,

Compressor with Bypass and Limiter

• Receive Path Contains Data Slicer, Adjustable Gain Amplifier, Sidetone

Attenuator, Filters, Expander with Bypass, Mute, Volume Control and

Power Amplifier

• Dual A/Ds are Provided to Monitor RSSI and VCC

• Independent Power Amplifier with Differential Outputs and Mute

• Selectable Frequency for Switched Capacitor Filters, PLLs and the LO

• Reference Frequency Source can be a Crystal or System Clock

• Serial µP Port to Control Gain, Mute, Frequency Selection, Phase

Detector Gain, Power Down Modes, Low Battery Detect and Others

• Power Supply Range: 2.7 to 5.5 V

• Power Down Modes for Power Conservation