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AFE8221 PDF预览

AFE8221

更新时间: 2024-11-08 03:18:07
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德州仪器 - TI /
页数 文件大小 规格书
48页 535K
描述
Dual IF Analog Front-End for Digital Radio

AFE8221 数据手册

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AFE8221  
www.ti.com  
SBAS394AAPRIL 2007REVISED MARCH 2008  
Dual IF Analog Front-End for Digital Radio  
1
FEATURES  
DESCRIPTION  
2345  
Two IF ADCs  
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.  
Two 12-Bit Auxiliary DACs  
8-Bit Auxiliary ADCs with Four-Channel Input  
MUX  
Integrated IF Digital Processing Core  
Integrated Circuitry for Third-Overtone Master  
Clock Oscillator  
Wakeup Circuit/Real-Time Clock with Separate  
Crystal Oscillator  
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 75MHz. The AFE8221 then  
digitally mixes, filters, and decimates the signal to  
provide I and 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.  
Flexible Data Interface Optimized for TMS  
Family of Digital Baseband Processors  
Pin-Selectable SPI™ and I2C™ Control  
Interfaces  
3.3V/1.8V Supply (Integrated Regulator  
Available to Optionally Generate 1.8V Supply)  
TQFP-144, PowerPAD™ Package  
The AFE8221 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. An 8-bit auxiliary ADC and  
input multiplexer (MUX) can be used for system  
diagnostic functions. Other features include 12  
APPLICATIONS  
IF-Sampled AM/FM Radio  
HD, DAB Digital Radio  
general-purpose  
input/output  
(GPIO)  
lines,  
programmable interrupt generators, and an I2C  
master for communication between the AFE and the  
tuner(s).  
The AFE8221 is available in a TQFP-144 (20mm ×  
20mm) package and uses a 3.3V and a 1.8V power  
supply. An onboard voltage regulator is included to  
optionally generate the 1.8V digital supply for the  
AFE8221.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
4
5
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.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2007–2008, Texas Instruments Incorporated  

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