CA3189E Technical Summary

Overview

The Harris CA3189E is a monolithic integrated circuit designed to provide all the essential functions of a comprehensive FM-IF system. It integrates a three-stage FM-IF amplifier/limiter configuration with level detectors, a doubly-balanced quadrature FM detector, and an audio amplifier with optional muting (squelch) functionality. The device is engineered for high-fidelity operation, making it suitable for demanding applications such as automotive, communications, and high-fidelity audio receivers.

The CA3189E features advanced circuit design elements, including programmable delayed AGC for RF tuners, an AFC drive circuit, and an output signal for tuning meter drive or stereo switching logic. Additionally, internal power-supply regulators ensure stable performance across a wide supply voltage range of +8.5V to +16V, maintaining nearly constant current drain.

Features

The CA3189E offers a robust set of features that enhance its performance and versatility in FM-IF applications:

• Integrated FM-IF System: Combines IF amplifier, quadrature detector, AF preamplifier, and specialized circuits for AGC, AFC, tuning meter, and muting.
• Exceptional Limiting Sensitivity: Typical sensitivity of 12µV at the -3dB point.
• Low Distortion: Achieves 0.1% THD (typical) with a double-tuned coil.
• Single-Coil Tuning: Simplifies circuit design and reduces component count.
• Improved Signal-to-Noise Ratio: Enhanced S+N/N performance for clearer audio output.
• Programmable Audio Level: Allows external adjustment of recovered audio levels.
• Muting Control: Provides signals for interchannel muting (squelch) functionality.
• Tuning Meter Drive: Includes a dedicated output for driving tuning meters.
• On-Channel Step: Supports search control functionality.
• Programmable AGC: Adjustable AGC voltage for RF amplifier control.
• Flexible Audio Output: Configurable audio output stage for diverse applications.
• Internal Voltage Regulators: Ensures stable operation across a wide supply range.

Applications

The CA3189E is designed for a broad range of FM-IF applications, including:

• High-Fidelity Audio Receivers: Delivers low distortion and high signal integrity for premium audio systems.
• Automotive Radios: Robust performance in demanding automotive environments.
• Communications Receivers: Suitable for professional and amateur radio applications.
• Tuner Systems: Integrates seamlessly with RF tuners for enhanced signal processing.

Electrical Characteristics

The CA3189E exhibits the following key electrical characteristics under typical operating conditions:

Absolute Maximum Ratings

• Supply Voltage (V+): +16V
• Operating Temperature Range: -40°C to +85°C
• Storage Temperature Range: -65°C to +150°C

Recommended Operating Conditions

• Supply Voltage Range: +8.5V to +16V
• Quiescent Current: 20mA (typical)
• IF Frequency Range: 10.7MHz (standard)

Performance Characteristics

• Limiting Sensitivity: 12µV (typical at -3dB)
• Total Harmonic Distortion (THD): 0.1% (typical with double-tuned coil)
• Signal-to-Noise Ratio (S+N/N): 70dB (typical)
• Audio Output Voltage: 100mV (typical at 1kHz)

Package Information

The CA3189E is available in a standard 16-pin dual in-line package (DIP), ensuring compatibility with a wide range of PCB designs and assembly processes. The package dimensions and pin configuration are as follows:

Package Dimensions

• Package Type: 16-pin DIP
• Length: 19.3mm (max)
• Width: 6.35mm (max)
• Height: 4.57mm (max)
• Pin Spacing: 2.54mm (standard)

Pin Configuration

• Pin 1: IF Input 1
• Pin 2: IF Input 2
• Pin 3: Ground
• Pin 4: Quadrature Detector Coil
• Pin 5: Audio Output
• Pin 6: Muting Control
• Pin 7: AFC Output
• Pin 8: Tuning Meter Drive
• Pin 9: AGC Output
• Pin 10: V+ Supply
• Pin 11: Audio Preamp Input
• Pin 12: Audio Preamp Output
• Pin 13: Muting Threshold Adjust
• Pin 14: On-Channel Step Adjust
• Pin 15: IF Output
• Pin 16: IF Bypass

Conclusion

The Harris CA3189E is a versatile and high-performance FM-IF system IC, offering a comprehensive suite of features for demanding audio and communication applications. Its advanced design, low distortion, and programmable functionality make it an ideal choice for engineers seeking reliable and high-fidelity signal processing solutions. With robust electrical characteristics and a standard 16-pin DIP package, the CA3189E is well-suited for integration into a wide range of electronic systems.