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Transceiver PMC module handles wideband signals

Posted: 22 May 2009 ?? ?Print Version ?Bookmark and Share

Keywords:transceiver? PMC module? wideband signal?

Model 7156 transceiver PMC module

From Pentek comes the Model 7156 dual channel transceiver PMC module, comprising two 400MHz ADCs with 14bit resolution and two 800MHz DACs with 16bit resolution. Both data converters on the 7156 use new Texas Instrument monolithic devices, the ADS5474 and the DAC5688, respectively.

While this module is immediately attractive to developers of military radio transceivers with high-bandwidth channels, the wideband data converters and multichannel synchronization also directly target new wideband radar applications.

The new PMC features a built-in clock synthesizer that accepts an external 5- or 10MHz reference and synthesizes two phase-locked, low-jitter clocks delivered separately to the ADC and DAC. A front panel digital connector synchronizes multiple 7156's to support beamforming, diversity combining and phased array applications.

The TI DAC5688 provides an interpolation filter and a digital upconverter to translate a complex baseband digital signal to an IF frequency up to 300MHz and then deliver it through the DAC as an analog IF output.

The dual FPGA architecture of the 7156 offers tremendous processing power with the flexibility to handle custom DSP algorithms in the signal processing FPGA and custom I/O functions in the interface FPGA. Both FPGAs are members of Xilinx's Virtex-5 family allowing customers to choose specific FPGA devices for each to fulfill particular requirements. Available FPGAs include LXT devices with generous logic resources and SXT devices with a wealth of DSP resources for signal processing.

In addition to the 100MHz 64bit PCI-X interface, the 7156 also offers an XMC interface for gigabit serial I/O. Customers can install their own serial communication Internet protocol or popular I/O standards such as Xilinx's Aurora, a low overhead protocol ideal for high speed point-to-point connections.

"At these high sampling rates, embedded systems developers can reap huge benefits by processing data locally using on-board FPGA resources," said Rodger Hosking, VP at Pentek. "Towards that end, the dual FPGA architecture of the 7156 was tailored specifically for custom FPGA development. For applications that still need high transfer rates to the rest of the system, we've also added tremendous I/O capability to eliminate bottlenecks and boost throughput. Both FPGAs are equipped with multiple 4x gigabit serial links, each capable of moving data at 1.25GBps. Flexible link path options connect both FPGAs to the XMC interface and to each other," he concluded.

Memory secured
A total of 512Mbyte of DDR2 SDRAM memory arranged in two banks, allows users to capture real-time data, storing it in a local memory. This feature will have particular appeal to those engaged in wideband radar, where the destination device cannot handle the peak real-time data rates, and the SDRAM acts as an elastic buffer.

The SDRAM can also be used to store an arbitrary waveform for playback through the DACs. Optionally, the total SDRAM capacity can be doubled to 1Gbyte.

The 7156 is supported under Windows, followed by Linux and VxWorks operating systems, with board support packages (BSP) for each. Each BSP includes an OS driver as well as a full feature ReadyFlow C language library to support all board functions and provide sample applications for quick development startup.

Pentek provides GateFlow FPGA design kits for both FPGAs. Each GateFlow kit includes all factory-installed functions, allowing users to add their own custom IP and signal processing algorithms to the factory infrastructure.

The price for the Model 7156 with the Windows OS begins at $11,500. Delivery is eight to ten weeks ARO.

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