TEA6848H

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.


Pinout




Specifications

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VDDA1	analog supply voltage 1 for IF amplifier 1 and 2		-0.3	+10	V
VDDA2	analog supply voltage 2 for FM mixer and AM mixer 1		-0.3	+10	V
VDDA3	analog supply voltage 3 for tuning PLL		-0.3	+10	V
VDDA4	analog supply voltage 4 for VCO		-0.3	+10	V
VDDA5	analog supply voltage 5 for on-chip power supply		-0.3	+6.5	V
VDDA6	analog supply voltage 6 for on-chip power supply		-0.3	+10	V
VDDD	digital supply voltage		-0.3	+6.5	V
VDD8.5-DD5	difference between any 8.5 V supply voltage and any 5 V supply voltage	note 1	-0.3	-	V
Tstg	storage temperature		-55	+150
Tamb	ambient temperature		-40	+85
Ves	electrostatic handling voltage	note 2	-200	+200	V
		note 3	-2000	+2000	V

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.