TEA0675

General description

The TEA0675 is a bipolar integrated circuit that provides two channels of Dolby B noise reduction for playback applications in car radios. It includes head and equalization amplifiers with electronically switchable time constants. Furthermore it includes electronically switchable inputs for tape drivers with reverse heads.

This device also detects pauses of music in the Automatic Music Search (AMS) scan mode, for applications with an intelligent controlled tape driver, or AMS-latch mode, for applications with a simple controlled tape driver. For both modes, the delay time can be fixed externally by a resistor. The device operates with power supplies in the range of 7.6 to 12 V, output overload level increasing with increase in supply voltage.

Current drain varies with the following variables:

• supply voltage
• noise reduction on/off
• AMS on/off.

Because of this current drain variation it is advisable to use a regulated power supply or a supply with a long time constant.

Features

• Dual noise reduction (NR) channels
• Head pre-amplifiers
• Reverse head switching
• Automatic Music Search (AMS)
• Music scan
• Equalization with electronically switched time constants
• Dolby reference level = 387.5 mV
• 24 pins
• Improved EMC behaviour.

Applications

• Demodulation of BPSK and QPSK modulated signals in satellite and telephone applications.

Block diagrams/pinning

Technical documents

Application Notes

AN96029_1; High-end RDS/EON car radio system CCR612 user manual (14-Mar-03)

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