TEA0679

INTEGRATED CIRCUITS DATA SHEET TEA0679T I2C-bus controlled dual Dolby* B-type noise reduction circuit for playback applications Product specification Supersedes data of 1998 Jun 24 File under Integrated Circuits, IC01 1998 Nov 12 Philips Semiconductors Product specification I2C-bus controlled dual Dolby* B-type noise reduction circuit for playback applications FEATURES Dual Noise Reduction (NR) channels Head preamplifiers Reverse head switching Automatic Music Search (AMS) Blank skip Mute position Equalization with electronically switched time constants Switch functions and level adjustment controlled via I2C-bus Optional switch inputs TTL compatible Dolby reference level = 387.5 mV Contained in a 32-pin small outline package Improved EMC behaviour. GENERAL DESCRIPTION The TEA0679T 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. The device also includes electronically switchable inputs for tape drivers with reverse heads. This device 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). QUICK REFERENCE DATA SYMBOL VCC ICC S+N ------------N supply voltage supply current signal plus noise-to-noise ratio PARAMETER − 78 MIN. 7.6 − 35 8...