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AFEDRI8201PFBT

更新时间： 2024-11-20 21:55:15
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IF ADC Front End for AM/FM and HD Radios

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AFEDRI8201PFBT 数据手册

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AFEDRI8201  
SBWS017F − SEPTEMBER 2003 − REVISED AUGUST 2005  
IF ADC Front End for AM/FM and HD Radios  
FD EATURES  
DESCRIPTION  
The AFEDRI8201 implements the receive channel analog  
functions required for intermediate-frequency (IF)  
sampled AM/FM and HD digital radio receivers. It is  
designed to be used with TI’s DRIx50 digital baseband  
processor. The AFEDRI8201 is programmed by the  
DRIx50 for use in AM/FM and HD radio. The AFEDRI8201  
oversamples the radio tuner IF output at speeds of up to  
80MHz to reduce noise and improve dynamic range. The  
radio tuner output IF is typically 10.7MHz for AM or FM as  
well as 450kHz or 455kHz for AM, as desired. The  
AFEDRI8201 then mixes, filters, and decimates the signal  
to provide baseband I and Q output signals to the digital  
baseband processor. The AFEDRI8201 also includes a  
general-purpose 12-bit control digital-to-analog converter  
(DAC) to provide a gain control signal or other analog  
feedback to the tuner.  
Interfaces To Texas Instruments DRIx50 HD  
Radio Baseband Processors  
D
12-Bit, 80MSPS ADC Reduces Noise and  
Improves Sensitivity  
D
Typical SNR of 102dB in 3kHz Bandwidth  
D
Programmable Input Range For Optimum  
Tuner Dynamic Range  
D
Integrated Digital Downconverter (DDC)  
− Quadrature Mixer, NCO, CIC Decimation  
Filter, And FIR Filters  
D
D
D
Mixer: 32-Bit Frequency and Phase  
Decimation Ratio: 32 to 4096  
User-Programmable FIR Filters with 16-Bit  
Coefficients  
D
12-Bit Auxiliary DAC  
The DRIx50 digital baseband device writes control register  
data as well as decimation filter coefficients to the  
AFEDRI8201 through the industry-standard SPI control  
interface. The baseband output signals are transported to  
the DRIx50 through a general-purpose, high-speed serial  
interface (TI’s Buffered Serial Ports, McBSP).  
D
Code Composer Module for Easy Software  
Generation  
SPIControl Interface  
D
AD PPLICATIONS  
This unit uses 3.3V analog and 1.8V digital power  
supplies. Typical power dissipation is 490mW. The digital  
I/O lines can be powered by a 3.3V supply.  
AM/FM and HD Radio Receivers  
IF Receive Channels  
Software Radios  
D
D
D
Narrowband Receivers  
DOUT0  
IFP  
12−Bit  
Pipeline  
ADC  
Quadrature  
Mixer  
CIC Filter  
N
FIR Filter 1  
2
FIR Filter 2A  
2
DOUT1  
DFSO  
DCLK  
DIN  
IFM  
NCO  
FIR Filter 2B  
2
Auxiliary  
DAC  
AUX  
DFSI  
Voltage  
Reference  
Clock  
Interface  
Timing  
Generator  
SPI Control  
Interface  
REFM VCM REFP VGB MCLK MCLKB PWD SYNC RESET  
SCK MOSI MISO CS  
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.  
SPI is a trademark of Motorola, Inc. All other trademarks are the property of their respective owners.  
ꢀꢁ ꢂ ꢃꢄ ꢅ ꢆꢇ ꢂꢈ ꢃ ꢉꢆꢉ ꢊꢋ ꢌꢍ ꢎꢏ ꢐꢑꢊ ꢍꢋ ꢊꢒ ꢓꢔ ꢎ ꢎ ꢕꢋꢑ ꢐꢒ ꢍꢌ ꢖꢔꢗ ꢘꢊꢓ ꢐꢑꢊ ꢍꢋ ꢙꢐ ꢑꢕꢚ ꢀꢎ ꢍꢙꢔ ꢓꢑꢒ  
ꢓ ꢍꢋ ꢌꢍꢎ ꢏ ꢑꢍ ꢒ ꢖꢕ ꢓ ꢊ ꢌꢊ ꢓ ꢐ ꢑꢊ ꢍꢋꢒ ꢖ ꢕꢎ ꢑꢛꢕ ꢑꢕ ꢎ ꢏꢒ ꢍꢌ ꢆꢕꢜ ꢐꢒ ꢇꢋꢒ ꢑꢎ ꢔꢏ ꢕꢋꢑ ꢒ ꢒꢑ ꢐꢋꢙ ꢐꢎ ꢙ ꢝ ꢐꢎ ꢎ ꢐ ꢋꢑꢞꢚ  
ꢀꢎ ꢍ ꢙꢔꢓ ꢑ ꢊꢍ ꢋ ꢖꢎ ꢍ ꢓ ꢕ ꢒ ꢒ ꢊꢋ ꢟ ꢙꢍ ꢕ ꢒ ꢋꢍꢑ ꢋꢕ ꢓꢕ ꢒꢒ ꢐꢎ ꢊꢘ ꢞ ꢊꢋꢓ ꢘꢔꢙ ꢕ ꢑꢕ ꢒꢑꢊ ꢋꢟ ꢍꢌ ꢐꢘ ꢘ ꢖꢐ ꢎ ꢐꢏ ꢕꢑꢕ ꢎ ꢒꢚ  
Copyright 2003−2005, Texas Instruments Incorporated  
www.ti.com  
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