Datasheet Texas Instruments AFE8221-Q1 — Datenblatt

AFE8221-Q1
www.ti.com . SBAS434 – DECEMBER 2008 DUAL INTERMEDIATE FREQUENCY (IF) ANALOG FRONT-END FOR DIGITAL RADIO FEATURES 1 Qualified for Automotive Applications Two Intermediate Frequency (IF)
Analog-to-Digital Converters (ADCs) Two 12-Bit Auxiliary Digital-to-Analog
Converters (DACs) 8-Bit Auxiliary ADCs with Four-Channel Input
Multiplexer (MUX) Integrated IF Digital Processing Core Integrated Circuitry for Third-Overtone Master
Clock Oscillator Wakeup Circuit/Real-Time Clock With Separate
Crystal Oscillator
234 Flexible Data Interface Optimized for TMS
Family of Digital Baseband Processors
Pin-Selectable SPIв„ў and I2Cв„ў Control
Interfaces
3.3-V/1.8-V Supply (Integrated Regulator
Available to Optionally Generate 1.8-V Supply)
TQFP-144 (RFP) PowerPADв„ў Package APPLICATIONS IF-Sampled AM/FM Radio
Hybrid Digital (HD) Digital Audio Broadcasting
(DAB) Digital Radio DESCRIPTION
The AFE8221 implements the intermediate frequency (IF) sampling and processing functions of a digital radio
receiver system. It is designed to be used with TI's digital radio baseband processors and AM/FM tuners. The
AFE8221 can also be programmed by the baseband processor for use in conventional AM/FM and digital radio.
This unit includes two IF inputs with associated filtering and digital processing circuitry.
The receive circuit oversamples the radio tuner IF output to reduce noise and improve dynamic range. The IF
analog-to-digital converter (ADC) oversamples the IF input at rates up to 75 MHz. The AFE8221 then digitally
mixes, filters, and decimates the signal to provide I and Q output signals to the baseband processor. A clock …