Philips Semiconductors
Product specification
New In Car Entertainment (NICE)
extended car radio
1
FEATURES
TEA6842H
•
FM mixer for conversion of FM RF from 65 to 108 MHz
to IF of 10.7 MHz; the mixer provides inherent image
rejection
•
FM RF mixer can be set to receive weather band radio
up to 162.55 MHz
•
Buffer output for weather band flag
•
AM mixer 1 for conversion of AM RF to AM IF1 of
10.7 MHz
•
LC tuner oscillator providing mixer frequencies for
FM mixer and AM mixer 1
•
AM mixer 2 for conversion of AM IF1 to AM IF2 of
450 kHz
•
Crystal oscillator providing mixer frequencies for
AM mixer 2 and reference for synthesizer PLL, IF count,
timing for inaudible Radio Data System (RDS) update
and reference frequency for car audio signal
processor ICs
•
Fast synthesizer PLL tuning system with local control for
inaudible RDS updating
•
Timing function for RDS update algorithm and control
signal output for car audio signal processor ICs
(TEA688x, SAA77xx) or car radio integrated signal
processor IC (TEF689x)
•
Digital auto alignment circuit for conversion of
LC oscillator tuning voltage to controlled alignment
voltage of FM antenna tank circuit
•
AGC PIN diode drive circuit for FM RF AGC; AGC
detection at FM mixer input; the AGC PIN diode current
can be set to a fixed value to allow local function for
search tuning; AGC threshold is a programmable and
keyed function switchable via the I
2
C-bus
•
FM IF linear amplifiers with high dynamic input range
•
FM quadrature demodulator with automatic centre
frequency adjustment and Total Harmonic Distortion
(THD) compensation and level driven soft mute;
soft mute characteristic is adjustable via the I
2
C-bus
3
ORDERING INFORMATION
TYPE
NUMBER
TEA6842H
PACKAGE
NAME
LQFP80
DESCRIPTION
plastic low profile quad flat package; 80 leads;
body 12
×
12
×
1.4 mm
VERSION
SOT315-1
•
Level detector for AM and FM with temperature
compensated output voltage; starting point and slope of
level output is programmable via the I
2
C-bus
•
AM RF PIN diode drive circuit; AGC threshold detection
at AM mixer 1 and IF2 AGC input; threshold is
programmable via the I
2
C-bus; AM IF2 AGC and
demodulator
•
AM AGC voltage buffer
•
AM AF output switchable to provide AM IF2 for
AM stereo decoder
•
AM noise blanker with blanking at AM IF2
•
Ultrasonic noise detector
•
Pin for external mute control
•
Several test modes available for fast IC and system
tests.
2
GENERAL DESCRIPTION
The TEA6842H is a single IC with car radio tuner for AM,
FM and Weather Band (WB) intended for microcontroller
tuning with the I
2
C-bus. It provides the following functions:
•
AM double conversion receiver for LW, MW and SW
(31 m, 41 m and 49 m bands) with IF1 = 10.7 MHz and
IF2 = 450 kHz
•
FM single conversion receiver with integrated image
rejection for IF = 10.7 MHz capable of selecting US FM,
US weather, Europe FM, East Europe FM and Japan
FM bands
•
The tuning system includes FM mixer, AM mixer 1,
AM mixer 2, crystal oscillator, VCO and PLL synthesizer
on one chip.
2003 Dec 19
3
Embedded System
京公网安备 11010802033920号
EEWORLD
