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TEA6848H

New In Car Entertainment car radio tuner IC with Precision Adjacent Channel Suppression (NICE-PACS)

Philips Electronics 

Philips Semiconductors

New In Car Entertainment car radio tuner IC with

Precision Adjacent Channel Suppression (NICE-PACS)

Product specification

TEA6848H

1 FEATURES

• FM mixer 1 for conversion of FM RF (65 to 108 MHz

and US weather band) to IF of 10.7 MHz; the mixer

provides inherent image rejection; for European and

US FM band/WB (weather band) the mixer is driven with

a ‘high’ injection Local Oscillator (LO); in Japan

FM band and East Europe FM band the mixer is driven

with a ‘low’ injection LO

• 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 FM mixer 2 and reference for

synthesizer PLL, IF count, timing for 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, TEF689x)

• Digital alignment circuit for bus controlled matching of

oscillator tuning voltage to FM antenna tank circuit

tuning voltage

• AGC PIN diode drive circuit for FM RF AGC; AGC

detection at FM mixer input; the AGC PIN diode drive

can be activated by the I2C-bus as a local function for

search tuning; AGC threshold is a programmable and

keyed function switchable via the I2C-bus

• FM IF linear amplifier with high dynamic input range

• FM mixer 2 for conversion of FM IF1 to FM IF2 of

450 kHz with inherent image rejection

• Fully integrated dynamic selectivity and

FM demodulator at IF2; improved sensitivity with

dynamic threshold extension; centre frequency of IF2

selectivity alignment via the I2C-bus

• Level detector for AM and FM with temperature

compensated output voltage; starting point and slope of

level output is programmable via the I2C-bus

• AM cascode AGC stage and RF PIN diode drive circuit;

AGC threshold detection at AM mixer 1 and IF2 AGC

input; threshold for detection at mixer 1 input is

programmable via the I2C-bus

• AM IF2 AGC and demodulator

• AM AF output switchable to provide AM IF2 for

AM stereo decoder

• AM noise blanker with detection at IF1 and blanking at

AM IF2

• Software controlled flag output

• Buffer output for weather band flag

• Adjacent channel detector, modulation detector and

frequency offset for instantaneous bandwidth control of

the integrated filter

• Flag and voltage output indicating the actual bandwidth

• I2C-bus alignment of centre frequency and gain variation

as functions of bandwidth of the IF2 filter and centre

frequency of the offset detector.

2 GENERAL DESCRIPTION

The TEA6848H is a single IC with car radio tuner for AM,

FM and Weather Band (WB) intended for microcontroller

tuning with the I2C-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 double conversion receiver with integrated image

rejection for IF1 and for IF2 capable of selecting US FM,

US weather, Europe FM, East Europe FM and

Japan FM bands; fully integrated dynamic selectivity at

450 kHz FM IF2; FM demodulator with dynamic

threshold extension; centre frequency alignment of IF2

selectivity via the I2C-bus

• The tuning system includes VCO, crystal oscillator and

PLL synthesizer on one chip.

3 ORDERING INFORMATION

TYPE NUMBER

TEA6848H

NAME

LQFP80

PACKAGE

DESCRIPTION

plastic low profile quad flat package; 80 leads; body 12 × 12 × 1.4 mm

2004 Nov 12

3

VERSION

SOT315-1

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