Model 7x40 (Pentek Inc)
Model 7140 is a software radio transceiver suitable for connection to HF or IF ports of a communications system. It includes two A/D and two D/A converters capable of bandwidths to 40 MHz and above. The Model 7140 uses the popular PMC format and supports the emerging VITA 42 XMC standard with optional switched fabric interfaces.Also available as the Model 7840 (x8 PCIe).
*Complete software radio transceiver solution *VITA 42.0 XMC compatible with switched fabric interfaces *Two 105 MHz 14-bit A/Ds * Input signal bandwidth: 40 MHz * Four digital downconverters *One digital upconverter * Two 500 MHz 16-bit D/As *512 MB of DDR SDRAM *Xilinx Virtex-II Pro FPGA *Up to 1.28 seconds of delay or data capture at 100 MHz *Dual timing buses for independent input and output clock rates *LVDS clock/sync bus for multi-module synchronization *32 pairs of LVDS connections to the Virtex-II Pro FPGA for custom I/O on P4 *Optional factory-installed IP Cores available *Ruggedized and conductioncooled versions available
A/D Converter Stage
The front end accepts two full scale
analog HF or IF inputs on front panel MMCX
connectors at +4 dBm into 50 ohms with
transformer coupling into AD6645 14-bit
105 MHz A/D converters.
The digital outputs are delivered into the
Virtex-II Pro FPGA for signal processing or
for routing to other module resources.
Digital Downconverter Stage
A TI/Graychip GC4016 quad digital
downconverter accepts either four 14-bit
inputs or three 16-bit digital inputs from
the FPGA, which determines the source of
GC4016 input data. These sources include
the A/D converters, FPGA signal processing
engines, SDRAM delay memory and
data sources on the PCI bus.
Each GC4016 channel may be set for independent
tuning frequency and bandwidth.
For an A/D sample clock frequency of
100 MHz, the output bandwidth for each
channel ranges from 5 kHz up to 2.5 MHz. By
combining two or four channels, output bandwidth
of up to 5 or 10 MHz can be achieved.
Digital Upconverter Stage
A TI DAC5686 digital upconverter (DUC)
and dual D/A accepts baseband real or complex
data streams from the FPGA with signal
bandwidths up to 40 MHz.
When operating as an upconverter, it
interpolates and translates real or complex
baseband input signals to any IF center
frequency between DC and 160 MHz. It
delivers real or quadrature (I+Q) analog
outputs through two 320 MHz 16-bit D/A
converters to two front panel MMCX connectors
at +4 dBm into 50 ohms.
If translation is disabled, the DAC5686 acts
as a two channel interpolating 16-bit D/A
with output sampling rates up to 500 MHz.
Virtex-II Pro FPGA
The Xilinx XC2VP50 Virtex-II Pro FPGA
serves as a control and status engine with
data and programming interfaces to each
of the on-board resources including the A/D
converters, GC4016 digital downconverter,
digital upconverter and D/A converters.
Factory installed FPGA functions include
data multiplexing, channel selection, data
packing, gating, triggering and SDRAM
Option -104 adds the P4 PMC connector
with 32 pairs of LVDS connections to the
Virtex-II Pro FPGA for custom I/O.
The FPGA includes two PowerPC cores
which can be used as local microcontrollers
to create complete application engines.
Clocking and Synchronization
Two independent internal timing buses
can provide either a single clock or two
different clock rates for the input and
Each timing bus includes a clock, a sync,Two external reference clocks are accepted,
one for each timing bus and two internal
clocks may be used for each timing bus.
A front panel 26-pin LVDS Clock/Sync
connector allows multiple modules to be
synchronized. In the slave mode, it accepts
differential LVDS inputs that drive the
clock, sync and gate signals for the two
internal timing buses.
In the master mode, the LVDS bus can
drive one or both sets of timing signals
from the two internal timing buses for
synchronizing multiple modules.
Up to seven slave 7140’s, can be driven
from the LVDS bus master, supporting
synchronous sampling and sync functions
across all connected boards. Up to 80 modules
may be synchronized with a Model 9190
Clock and Sync Generator.
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