Model 6235 (147)
Model 6235 is a dual wideband digital receiver VIM-2 module. It attaches directly to VIM-compatible processor boards and includes a Virtex-II FPGA (Field Programmable Gate Array) and two 12-bit A/Ds.
*Two identical receiver channels include A/D, digital downconverter and a shared FPGA * Two low distortion 105 MHz 12-bit A/D converters * Wideband digital downconverters with decimation range from 2 to 64 *Output bandwidths to 40 MHz for 100 MHz sampling clock *Advanced Virtex-II FPGA for signal preprocessing *Factory-installed cores available
The Model 6235 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 AD9432 12-bit
A/D converter. The AD9432 is capable of
operating at sample rates 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 digitized output of each A/D feeds
the Graychip GC1012B wideband digital
downconverter, capable of 40 MHz bandwidth
at 100 MHz sampling clock. It offers
a programmable decimation range from 2
to 64 and delivers complex 16-bit I and Q
samples to the FPGA.
The front panel clock and sync bus allow
one 6235 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.
Additional sync lines allow synchronization
of the local oscillator phase, frequency
switching, decimating filter phase, and
FIFO data collection on multiple 6235’s.
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