Description

Intersil CA3089 is a monolithicintegrated circuit that provides all the functions of a comprehensive FM-IF system. The block diagram shows the CA3089 features, which include a three-stage FM-IF 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.

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

• Includes: IF Amplifier, Quadrature Detector, AF Preamplifier, and Specific Circuits for AGC, AFC, Muting (Squelch), and Tuning Meter

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

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

• Single-Coil Tuning Capability

• High Recovered Audio . . . . . . . . . . . . . . . . . .400mV (Typ)

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

• Provides Specific Signal for Direct Drive of a Tuning Meter

• Provides Delayed AGC Voltage for RF Amplifier

• Provides a Specific Circuit for Flexible AFC

• Internal Supply-Voltage Regulators