Sundance SMT381 2004 - Manual (Page 10)

1 Introduction
1.1 Overview
The SMT381-VP is a single width expansion module that plugs onto the SMT338-VP.
It is capable of converting two external digital inputs coming form the SMT338-VP at
840 MSPS with a resolution of 14 bits, or from internal memory at 1GSPS. A Fujitsu
dual channel DAC (
MB86064 ) performs the digital to analogue conversion.
The SMT381 (daughter card) is plugged into the SMT338-VP (main module). Digital
data is then supplied from the SMT338-VP via the daughter card connector over the
Sundance LVDS Bus to the SMT381 which converts the digital data stream to an
analogue signal.
The SMT338-VP controls data transfers via ComPorts, Sundance High-speed Bus
(
SHB ) or the Rocket Serial Link (RSL) (The RSL interface is not yet implemented).
These interfaces are compatible with a wide range of Sundance processor and I/O
modules.
A very important aspect must be kept in mind by the user. The DAC is rated for
1 GSPS but the SMT338-VP’s FPGA can only supply data to the DAC at 840MHz. It
is however possible to load data into the onboard memory on the DAC. This internal
data can be converted at 1GSPS.
1.2 Module Features
The main features of the SMT381 are listed underneath:
•
Dual channel DAC
•
1 GSPS conversion frequency from internal memory
•
840MSPS conversion frequency for data coming from the SMT338-VP
•
14 Bit data resolution
•
Custom Clock and Trigger inputs via external connectors
•
Internal Waveform generator
•
Standard Sundance ComPorts and SHB interfaces for easy interconnection to
Sundance products (interfaces for data sample and non-real-time processing)
1.3 Possible Applications
The SMT381-VP can be used for the following applications (this non-exhaustive list
should be taken as an example):
•
Broadband cable modem head-end systems
•
3G Radio transceivers
•
High-data-rate point-to-point radios
•
Medical imaging systems
•
Spectrum analyzers