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TEA0675T Datasheet(PDF) 2 Page - NXP Semiconductors |
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TEA0675T Datasheet(HTML) 2 Page - NXP Semiconductors |
2 / 32 page 1996 Jun 07 2 Philips Semiconductors Preliminary specification Dual Dolby* B-type noise reduction circuit for playback applications TEA0675 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. 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. QUICK REFERENCE DATA ORDERING INFORMATION Remark Dolby*: Available only to licensees of Dolby Laboratories Licensing Corporation, San Francisco, CA94111, USA, from whom licensing and application information must be obtained. Dolby is a registered trade-mark of Dolby Laboratories Licensing Corporation. SYMBOL PARAMETER MIN. TYP. MAX. UNIT VCC supply voltage 7.6 − 12 V ICC supply current − 26 31 mA signal plus noise-to-noise ratio 78 84 − dB TYPE NUMBER PACKAGE NAME DESCRIPTION VERSION TEA0675 SDIP24 plastic shrink dual in-line package; 24 leads (400 mil) SOT234-1 TEA0675T SO24 plastic small outline package; 24 leads; body width 7.5 mm SOT137-1 SN + N -------------- |
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