Description

The Harris CA3189E is a monolithic integrated circuit that provides all the functions of a comprehensive FM-lF system. The block diagram of the CA3189E includes a three-stage FM-lF amplifier/limiter configuration with level detectors for each stage, a doubly-balanced quadrature FM detector and an audio amplifier that features the optional use of a muting (squelch) circuit

Features

• Includes IF Amplifier, Quadrature Detector, AF Preamplifier, and Specific Circuits for AGC, AFC, Tun ing Meter, Deviation-Noise Muting, and ON Channel Detector

• FM IF Amplifier Applications in High-Fidelity, Automotive, and Communications Receivers

• Exceptional Limiting Sensitivity -12µV (Typ) at -3dB Point

• Low Distortion -0.1 (Typ) (with Double-Tuned Coil)

• Single-Coil Tuning Capability

• Improved S + N/N Ratio

• Externally Programmable Recovered Audio Level

• Provides Specific Signal for Control of Interchannel Muting (Squelch)

• Provides Specific Signal for Direct Drive of a Tuning Meter

• On Channel Step for Search Control

• Provides Programmable AGC Voltage for RF Amplifier

• Provides a Specific Circuit for Flexible Audio Output

• Internal Supply Voltage Regulators

• Externally Programmable “On” Channel Step Width, and Deviation at Which Muting Occurs