Analog Front-End. AFE8221-Q1 Datasheet

AFE8221-Q1 Front-End. Datasheet pdf. Equivalent

Part AFE8221-Q1
Description Analog Front-End
Feature AFE8221-Q1 www.ti.com ..............................................................................
Manufacture etcTI
Datasheet
Download AFE8221-Q1 Datasheet



AFE8221-Q1
AFE8221-Q1
www.ti.com ........................................................................................................................................................................................... SBAS434 – DECEMBER 2008
DUAL INTERMEDIATE FREQUENCY (IF) ANALOG FRONT-END FOR DIGITAL RADIO
FEATURES
1
234 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
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-144 (RFP) PowerPAD™ 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
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 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 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 (20 mm × 20 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 AFE8221.
TA
–40°C to 85°C
ORDERING INFORMATION(1)
PACKAGE (2)
ORDERABLE PART NUMBER
HTQFP – RFP
Tray of 60
AFE8221IRFPQ1
TOP-SIDE MARKING
AFE8221Q
(1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI
web site at www.ti.com.
(2) Package drawings, thermal data, and symbolization are available at www.ti.com/packaging.
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.
PowerPAD is a trademark of Texas Instruments.
2
SPI is a trademark of Motorola, Inc.
3
I2C is a trademark of NXP Semiconductors.
4
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 © 2008, Texas Instruments Incorporated



AFE8221-Q1
AFE8221-Q1
SBAS434 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
ABSOLUTE MAXIMUM RATINGS(1)
over operating free-air temperature range (unless otherwise noted)
Supply voltage range
Voltage between
VIN
VOUT
TA
Tstg
Digital input voltages(2)
Digital data output voltage
Operating free-air temperature range
Storage temperature range
AVDD
DVDD
IOVDD
AGND to DGND
AVDD to DVDD
–0.5 V to 3.6 V
–0.5 V to 3.6 V
–0.5 V to 3.6 V
–0.3 V to 0.5 V
–3.3 V to 3.3 V
–0.3 V to (DVDD + 0.3 V)
–0.3 V to (DVDD + 0.3 V)
–40°C to 85°C
–55°C to 125°C
(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings
only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) Measured with respect to DGND.
RECOMMENDED OPERATING CONDITIONS
over operating free-air temperature range (unless otherwise noted)
AVDD
DVDD
IOVDD
VIH
VIL
TA
PARAMETER
Analog supply voltage
Digital supply voltage
Output driver supply voltage
Input common-mode voltage
Differential input voltage
High-level input voltage, digital inputs
Low-level input voltage, digital inputs
Operating free-air temperature
MIN
3.14
1.6
1.6
0.7 × IOVDD
TYP
3.3
1.8
VCM
2
–40
MAX UNIT
3.6 V
2.0 V
3.6 V
V
VPP
V
0.25 × IOVDD V
+85 °C
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Copyright © 2008, Texas Instruments Incorporated
Product Folder Link(s): AFE8221-Q1





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