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AFE8221IRFPQ1
Automotive Catalog Dual IF Interface for Digital Radio
1FEATURES
DESCRIPTION
AFE8221-Q1
www.ti.com........................................................................................................................................................................................... SBAS434–DECEMBER 2008
DUAL INTERMEDIATE FREQUENCY (IF) ANALOG FRONT-END FOR DIGITAL RADIO Flexible Data Interface Optimized for TMS
Familyof Digital Baseband Processors
234• Qualified for Automotive Applications Pin-Selectable SPI™ andI2 C™ Control•
Two Intermediate Frequency (IF)
InterfacesAnalog-to-Digital Converters (ADCs) 3.3-V/1.8-V Supply (Integrated Regulator•
Two 12-Bit Auxiliary Digital-to-Analog Availableto Optionally Generate 1.8-V Supply)Converters (DACs) TQFP-144 (RFP) PowerPAD™ Package•
8-Bit Auxiliary ADCs with Four-Channel Input •
IF-Sampled AM/FM Radio•
Integrated Circuitry for Third-Overtone Master •
Hybrid Digital (HD) Digital Audio BroadcastingClock Oscillator (DAB) Digital Radio•
Wakeup Circuit/Real-Time Clock With Separate
Crystal OscillatorThe AFE8221 implements the intermediate frequency (IF) sampling and processing functionsofa digital radio
receiver system.Itis designedto be used with TI's digital radio baseband processors and AM/FM tuners. The
AFE8221 can alsobe programmed by the baseband processor for usein conventional AM/FM and digital radio.
This unit includes twoIF inputs with associated filtering and digital processing circuitry.
The receive circuit oversamples the radio tunerIF outputto reduce noise and improve dynamic range. TheIF
analog-to-digital converter (ADC) oversamples theIF inputat rates upto 75 MHz. The AFE8221 then digitally
mixes, filters, and decimates the signalto provideI andQ output signalsto the baseband processor.A clock
oscillator circuitis provided that can be used withan appropriate third-overtone crystal and external tank circuitto
generate the sampling clockfor theIF ADCs.
The AFE8221 also includesa real-time clock and associated low-power oscillator circuit. Two auxiliary
digital-to-analog converters (DACs) are included for system control functions. An 8-bit auxiliary ADC and input
multiplexer (MUX) can be used for system diagnostic functions. Other features include 12 general-purpose
input/output (GPIO) lines, programmable interrupt generators, and anI2C master for communication between the
AFE and the tuner(s).
The AFE8221is availableina TQFP-144 (20 mm× 20 mm) package and usesa 3.3-V anda 1.8-V power
supply. An onboard voltage regulatoris includedto optionally generate the 1.8-V digital supply for the AFE8221.
ORDERING INFORMATION(1) PACKAGE(2) ORDERABLE PART NUMBER TOP-SIDE MARKING–40°Cto 85°C HTQFP– RFP Trayof60 AFE8221IRFPQ1 AFE8221Q
(1) Forthe most current package and ordering information, seethe Package Option Addendumatthe endof this document,or seetheTI
web siteat www.ti.com.
(2) Package drawings, thermal data, and symbolizationare availableat www.ti.com/packaging.
