AFEDRI8201
SBWS017F -SEPTEMBER 2003 -REVISED AUGUST 2005 IF ADC Front End for AM/FM and HD Radios
FEATURES DESCRIPTION D Interfaces To Texas Instruments DRIx50 HD 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. 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
D
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