Model 6236 (147)
Model 6236 is a dual 14-bit A/D VIM-2 module. It attaches directly to VIMcompatible baseboards and includes a Virtex- II FPGA (Field Programmable Gate Array) as well as optionally available wideband digital receivers.
*Two low distortion 105 MHz 14-bit A/D converters * Internal or external A/D sample clock to 105 MHz *Advanced Virtex-II FPGA for signal preprocessing *Front panel sync bus *ASIC and FPGA wideband downconverter options
The Model 6236 accepts two analog RF
inputs at +4 dBm full scale into 50 ohms on
front panel SMA connectors.
Each of the two inputs is transformer
coupled and digitized by an Analog Devices
AD6645-105 14-bit A/D converter. The
AD6645 is capable of operating at sample
rates from 30 MHz to 105 MHz.
The A/D converter clock can be driven
from an internal crystal oscillator or from an
external sample clock supplied through
a front panel SMA connector or front panel
The A/D outputs are delivered to a Xilinx
Virtex-II FPGA (Model XC2V1000
standard; XC2V3000 optional) which is
factory configured to perform various
modes of data packing, formatting and
channel selection. The A/D outputs are
connected directly to the FPGA so that
wideband A/D data can be delivered directly
to the DSP board.
Optionally available design kits allow the
FPGA to be configured by the user for
implementation of custom preprocessing
functions such as convolution, framing, pattern
recognition and decompression.
Optional Digital Downconverters
The 6236 offers two different wideband
digital downconverter options, each featuring
a decimation range from 2 to 64.
Option -212 adds two bypassable
Graychip GC1012B downconverter ASICs
with 40 MHz maximum bandwidth for a
100 MHz sample clock, 75 dB stopband
attenuation, 12-bit input and 16-bit output.
Option -421 adds a dual-channel Gate-
Flow Downconverter Installed Core within
the FPGA with 42 MHz maximum bandwidth
for a 105 MHz sample clock, 100 dB
stopband attenuation, 14-bit input, 24-bit
output and programmable filter coefficients.
The front panel clock and sync bus allow
one 6236 to act as a master driving the
sample clock out to a front panel cable bus
using LVDS differential signaling. Multiple
slaves can then be clocked synchronously
with the master.
Front Panel I/O
An optional front panel connector provides
digital input and output for the FPGA.
These lines are available for triggering, synchronizing,
or framing signals. They are also
useful during FPGA algorithm development
for timing and signal probing.
VIM Processor Interface
The FPGA outputs are connected
directly through the VIM mezzanine interface
to the 32-bit synchronous BI-FIFO on the
VIM processor board where it is buffered for
efficient block transfers into the DSP.
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