●The AFE8220 implements the intermediate frequency (IF) sampling and processing functions of a digital radio receiver system. It is designed to be used with TIs digital radio baseband processors and AM/FM tuners. The AFE8220 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 AFE8220 then digitally mixes, filters, and decimates the signal to provide in-phase (I) and quadrature (Q) output signals to the baseband processor. A clock oscillator circuit is provided that can be used with an appropriate third-overtone crystal and external tank circuit to generate the sampling clock for the IF ADCs.
●The AFE8220 also includes a real-time clock and associated low-power oscillator circuit. Two auxiliary digital-to-analog converters (DACs) are included for system control functions. Other features include eight general-purpose input/output (GPIO) lines and programmable interrupt generators.
●The AFE8220 is available in a TQFP-100 (14 mm × 14 mm) package and uses a 3.3-V and a 1.8-V power supply. An onboard voltage regulator is included to optionally generate the 1.8-V digital supply for the AFE8220.
● Qualified for Automotive Applications
● Two Intermediate Frequency (IF)
●Analog-to-Digital Converters (ADCs)
● Two 12-Bit Auxiliary Digital-to-Analog
●Converters (DACs)
● Integrated IF Digital Processing Core
● Integrated Circuitry for Third-Overtone
●Master Clock Oscillator
● Wakeup Circuit/Real-Time Clock With Separate
●Crystal Oscillator
● Flexible Data Interface Optimized for TMS
●Family of Digital Baseband Processors
● Pin-Selectable SPI and I2C Control
●Interfaces
● 3.3-V/1.8-V Supply (Integrated Regulator
●Available to Optionally Generate 1.8-V Supply)
● TQFP-100 PowerPAD Package
● APPLICATIONS
● IF-Sampled AM/FM Radio
● Hybrid Digital (HD) Digital Audio Broadcasting
●(DAB) Digital Radio
●PowerPAD is a trademark of Texas Instruments.
●SPI is a trademark of Motorola, Inc.
●I2C is a trademark of NXP Semiconductors.
●All other trademarks are the property of their respective owners.
