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