Sundance SMT350 - Manual (Page 8)

Version 1.9 Page 8 of 45 SMT350 User Manual
Introduction
Overview
The SMT350 is a single width expansion TIM that plugs onto the SLB base module
SMT368 (Virtex-4 FPGA) and incorporates 2 Texas Instrument Analog-to-Digital
Converters ( ADS5500 ) and a Texas Instrument dual-channel Digital-to-Analog
Converter ( DAC5686 ). The SMT350 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
an external reference clock. It provides a complete conversion solution and stands as
a platform that can be part of a transmit/receive base station.
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.
The
Xilinx FPGA (Virtex-4) on the base module is responsible for handling data
going/coming to/from one of the following destination/source: TI converters, Comport
(
TIM-40 standard ), Sundance High-speed Bus ( SHB ). These interfaces are
compatible with a wide range of Sundance’s modules.
The memory on base module can be divided into two 16-bit wide independent blocks
for storing incoming and/or outgoing samples.
Converter configuration, sampling and transferring modes are set via internal control
registers stored inside the FPGA and accessible via Comport.
Module features
The main features of the SMT350 are listed below:
● Dual 14-bit 125MSPS ADC ( ADS5500 ),
● Dual channel 16-bit 500MSPS DAC ( DAC5686 ),
● On-board low-jitter clock generation ( CDCM7005 ),
● One external clocks, two external triggers and one reference clock via
MMCX connector,
● One SLB connector to link SMT350 and SMT368,
● Synchronisation signals,
● All Analogue inputs to be connected to 50-Ohm sources.
● All Analogue outputs to be connected to 50-Ohm loads.
● Temperature sensors.