AFE8221

更新时间： 2024-11-10 03:18:07

品牌	Logo	应用领域
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

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AFE8221 数据手册

AFE8221

www.ti.com

SBAS394A–APRIL 2007–REVISED MARCH 2008

Dual IF Analog Front-End for Digital Radio

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.

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.

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.

12 3 4 5 6 7...48

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与AFE8221相关器件

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AFE8221IRFPQ1	TI	获取价格	DUAL INTERMEDIATE FREQUENCY (IF) ANALOG FRONT-END FOR DIGITAL RADIO
AFE8221-Q1	TI	获取价格	DUAL INTERMEDIATE FREQUENCY (IF) ANALOG FRONT-END FOR DIGITAL RADIO
AFE8221RFP	TI	获取价格	Dual IF Analog Front-End for Digital Radio
AFE8405	TI	获取价格	14-BIT, 85-MSPS, SINGLE-ADC, 8-CHANNEL WIDEBAND RECEIVER
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AFE8406	TI	获取价格	14-Bit, 85 MSPS Dual ADC, 8-Channel Wideband Receiver
AFE8406IZDQ	TI	获取价格	14-BIT, 85 MSPS DUAL ADC, 8-CHANNEL WIDEBAND RECEIVER
AFE8406TBD	TI	获取价格	14-Bit, 85 MSPS Dual ADC, 8-Channel Wideband Receiver
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