TEA0675

INTEGRATED CIRCUITS DATA SHEET TEA0675 Dual Dolby* B-type noise reduction circuit for playback applications Preliminary specification Supersedes data of July 1993 File under Integrated Circuits, IC01 1996 Jun 07 Philips Semiconductors Preliminary specification Dual Dolby* B-type noise reduction circuit for playback applications 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. 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. QUICK REFERENCE DATA SYMBOL VCC ICC S+N ------------N supply voltage supply current signal plus noise-to-noise ratio PARAMETER − 78 MIN. 7.6 − 26 84 TYP. TEA0675 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 increas...