TEA6845AH

Features:

· 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; weather band radio flag output
· 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 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 (TEF6890H)
· 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 drive can be activated by the I2C-bus as a local or distance function; AGC threshold is a programmable and keyed function switchable via the I2C-bus
· FM IF linear amplifiers with high dynamic input range
· FM quadrature demodulator with automatic centre frequency adjustment and Total Harmonic Distortion (THD) compensation
· 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 RF PIN diode drive circuit; AGC threshold detection at AM mixer 1 and IF2 AGC input; threshold 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 blanking at AM IF2
· Several test modes available for fast IC and system tests.


Pinout




Specifications

SYMBOL	PARAMETER	CONDITIONS	MIN.	MAX.	UNIT
VDDA1	analog supply voltage 1 for on-chip power supply		-0.3	+10	V
VDDA2	analog supply voltage 2 for on-chip power supply		-0.3	+6.5	V
VDDA3	analog supply voltage 3 for VCO		-0.3	+10	V
VDDA4	analog supply voltage 4 for tuning PLL		-0.3	+10	V
VDDA5	analog supply voltage 5 for FM and AM RF		-0.3	+10	V
VDDA6	analog supply voltage 6 for IF amplifier 1 and 2		-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 TEA6845 is a single IC with car radio tuner for AM and FM 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 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.