AFE8201 Datasheet, PDF (1/20 Pages) Burr-Brown (TI) – IF Analog-to-Digital Converter with Digital Downconverter

AFE8201
SBWS016A − OCTOBER 2003 − REVISED JANUARY 2005
IF Analog-to-Digital Converter
with Digital Downconverter
FEATURES
D 12-BIT, 80MSPS ADC
D INTEGRATED DIGITAL DOWNCONVERTER (DDC):
Quadrature Mixer/NCO
CIC Decimation Filter
FIR Filters
D MIXER: 32-BIT FREQUENCY AND PHASE
D DECIMATION RATIO: 32 to 4096
D USER PROGRAMMABLE FIR FILTERS WITH
16-BIT COEFFICIENTS
D 12-BIT AUXILIARY DAC
D DATA INTERFACE COMPATIBLE WITH TI C5x/C6x
DSP BUFFERED SERIAL PORT (McBSP):
Code Composer Module for Easy Software
Generation
D SPI CONTROL INTERFACE
D 3.3V ANALOG, 1.8V DIGITAL SUPPLY
D 1.8V to 3.3V I/O SUPPLY
D TQFP-48
APPLICATIONS
D SOFTWARE RADIOS
D IF RECEIVE CHANNEL
D DIGITAL RADIO RECEIVERS
D NARROWBAND RECEIVERS
DESCRIPTION
The AFE8201 consists of a general-purpose, 80MSPS,
12-bit analog-to-digital converter (ADC), a digital
downconverter (DDC), and user-programmable digital
filters. It is designed to sample narrowband (2.5MHz or
less) IF signals and digitally mix, filter, and decimate the
signals to baseband.
The DDC consists of a digital quadrature mixer followed
by a CIC decimation filter and FIR filters. The mixer
frequency and initial phase are independently
programmed by 32-bit control words.
After the CIC filter, the internal I and Q signals are
passed on to the first FIR filter, which can implement
even, odd, halfband, and arbitrary impulse responses
with up to 62 taps using 16-bit coefficients.
Following the first FIR filter are two parallel FIR filters
that can be used to provide two output streams or
interleaved to form one extended filter with up to 262
taps. The AFE8201 also contains a 12-bit
general-purpose auxiliary digital-to-analog converter
(DAC) for applications such as AGC amplifier control.
Control register data as well as decimation filter
coefficients are written to the AFE8201 through the
industry-standard SPI control interface. The baseband
output signals are transported through a general-
purpose, high-speed serial interface that is compatible
with TI C5x/C6x DSP family buffered serial ports
(McBSP).
IFP
IFM
12−Bit
Pipeline
ADC
Quadrature
Mixer
CIC Filter
N
FIR Filter 1
2
NCO
AUX
Auxiliary
DAC
Voltage
Reference
Clock
Interface
Timing
Generator
FIR Filter 2A
2
FIR Filter 2B
2
SPI Control
Interface
DOUT0
DOUT1
DFSO
DCLK
DIN
DFSI
REFM VCM REFP VGB
MCLK MCLKB PWD SYNC RST_N SCK MOSI MISO CS_N
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