playback applications. TEA0679 Datasheet

TEA0679 applications. Datasheet pdf. Equivalent

Part TEA0679
Description I2C-bus controlled dual Dolby* B-type noise reduction circuit for playback applications
Feature INTEGRATED CIRCUITS DATA SHEET TEA0679T I2C-bus controlled dual Dolby* B-type noise reduction circ.
Manufacture NXP
Datasheet
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INTEGRATED CIRCUITS DATA SHEET TEA0679T I2C-bus controlled TEA0679 Datasheet
TEA0679T Datasheet
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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



TEA0679
Philips Semiconductors
I2C-bus controlled dual Dolby* B-type noise
reduction circuit for playback applications
Product specification
TEA0679T
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).
For both modes the delay time can be fixed by using an
external resistor. In the blank skip mode the IC can detect
pauses of music during playback and allows a
microcontroller to react on this situation.
The equalization amplifier gain adjustment, the output
offset adjustment and all switching functions are I2C-bus
controlled. Head switching and equalization time constant
switching can be controlled via separate pins (optional).
The device operates with power supplies from 7.6 to 12 V.
The output overload level increases with increases 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
SYMBOL
VCC
ICC
S------N+-----N---
PARAMETER
supply voltage
supply current
signal plus noise-to-noise ratio
MIN.
7.6
78
TYP.
35
84
MAX.
12
40
UNIT
V
mA
dB
ORDERING INFORMATION
TYPE
NUMBER
TEA0679T
NAME
SO32
PACKAGE
DESCRIPTION
plastic small outline package; 32 leads; body width 7.5 mm
VERSION
SOT287-1
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.
1998 Nov 12
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