3U PXI express board Virtex-5 Dual ADC/ DAC module

s750The SMT750 combines the power of the SMT950 with the PXIe compliant SMT700 carrier card.

This enables the use of an SMT950 WITHOUT a TIM (Such as SMT351-T), within a PXIe rack.

Details of each board follow.

The SMT700 is a Virtex 5 based PXIe board.

The SMT700 module uses a Xilinx Virtex 5 LXT or SXT to implement the interfaces the board provides. The FPGA can be configured either via the onboard flash, or through the Xilinx JTAG header.

The SMT700 is one of the first of a new range of Sundance cards that includes a direct connection to SLB (Sundance Local Bus) compatible mezzanine card, without the need for a Sundance TIM. This enables a variety of cards to be added to a system, for example extra Ethernet ports, video in/out, High speed ADC / DAC etc. Data from these extra cards (along with data from the SMT700’s own inputs – up to 1Gb/s Ethernet, 2.5Gb/s optical links, and RSL links) can be processed via the Virtex 5, or by another linked card or module.


  • Xilinx Virtex 5 SX50T in an FF1136 package.
  • FPGA configuration from 64MByte flash using a Xilinx Coolrunner CPLD.
  • One 64-bit wide data bank of DDR2 memory. The bank uses 4 16-bit wide devices. Running this memory at 220MHz provides a maximum access speed of over 3.5Gbyte/s.
  • Sundance LVDS Bus (SLB) connector.
  • Front panel SATA connectors carrying Virtex5 serial interfaces.
  • Front panel RJ45 for gigabit Ethernet.
  • Front panel Fibre Optic modules carrying Virtex5 Serial interfaces.
  • Sundance RSL connector with 4 serial interfaces.
  • On-board USB interface to allow re-programming of the flash memory.

The SMT950 incorporates 2 Texas Instrument Analog-to-Digital Converters (ADS5500) and one Texas Instrument dual-channel Digital-to-Analog Converter (DAC5687). The SMT950 implements a comprehensive clock circuitry based on a CDCM7005 chip that allows synchronisation among the converters and cascading modules for multiple receiver or transmitter systems as well as the use of external clocks. It provides a complete conversion solution and stands as a platform that can be part of a transmit/receive base station. External Triggers are also available.

ADCs are 14-bit and can sample at up to 125 MHz. The DAC has a resolution of 16 bits and is able to update outputs at up to 500MHz. All converters are 3.3-Volt.


  • Two 14-bit ADCs (ADS5500 – TI) sampling at up to 125 MHz
  • One 16-bit, 2x-16x interpolating dual channel DAC (DAC5687 – TI)
  • One SLB connector
  • Single width expansion module (mezzanine module)
  • On-board low-jitter clock synchronizer
  • One external clock and Two triggers via MMCX connectors (Huber Suhner)
  • External reference clock for synchronising and cascading modules
  • Analogue Inputs/Outputs via MMCX (Huber Suhner) connectors for connection to 50-Ohm sources/loads