描述 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

特性 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