Model 271 - Red Rapids
SigStream RX2 16/250
Red Rapids
Model 271
Signal Acquisition
The SigStream product family performs general purpose
signal acquisition for a broad range of applications (scientific,
medical, industrial, communications). The Model 271
can supply either raw ADC samples or complex samples
produced by the embedded digital down converter. The
down converter features a tuning resolution of Fs/223 and
ten selectable octave sub-bands in addition to the full output
bandwidth of the ADC.
The Model 271 is designed around the Texas Instruments
ADS42LB69 16-bit ADC. The 250 MHz sample clock is
supplied by either the on-board frequency synthesizer or an
external source. The frequency synthesizer can be phase
locked to the local 10 MHz TCXO or an external reference
can be used to achieve system-wide phase coherence.
Available in XMC, CCXMC, PCIe formats
Dual 16-bit (250 MHz) ADCs
AC or DC coupled analog inputs
Fixed or variable frequency synthesizer
Selectable triggers (HW, SW, TOD)
Continuous, snapshot, periodic operation
29.8 Hz tuning resolution (Fs = 250 MHz)
Full bandwidth plus ten octave sub-bands
VITA 49 compliant data packet format
PCI Express (PCIe) x8 Gen 2 bus
Scatter-gather DMA bus master
SMA
Channel 2
Optional
External
Reference
or Clock
SMA
Channel 1
SMA
GPIO
Trigger
The Model 271 is available as a PCI Express mezzanine
card (XMC), conduction cooled mezzanine card (CCXMC),
or half-length PCI Express (PCIe) adapter card. The CCXMC
can be mounted to any VITA 20-2001 compliant host without
modification. All form factors offer four lane (x4) or eight lane
(x8) bus operation at Gen 2 performance.
All SigStream products include a rich set of software
programmable features that include selectable operating
modes (continuous, snapshot, periodic), external or timed
event triggers, timestamped data samples, data sizing,
and data packing. Data is sent to the host computer as a
continuous stream of samples or in data packets defined by
the VITA 49 specification.
Signal acquisition can be started by software command,
software trigger, external hardware trigger, or preset time of
day. These same options are available to stop a collection.
Time of Day
Trigger
Select
Header
50 ohm
Trigger
SMA
Windows, Linux, VxWorks drivers & API
The on-board frequency synthesizer can be fixed to a
specified sample rate for optimum phase noise and spurious
performance, or it can be variable for maximum flexibility.
The variable frequency synthesizer is programmed in 100
kHz step sizes.
PCIe
Controller
AC/DC Coupler
AC/DC Coupler
A/D
A/D
Frequency
Synthesizer
SigStream
Datapath
TCXO
FIFO
DMA
Engine
PCIe Bus
Red Rapids
SigStream RX2 16/250
The start/stop events can be used to define the length of a snapshot,
but there is also a feature to simply specify the number of samples to
process following the start event.
The SigStream product can be programmed to repeat snapshots on a
periodic interval. The length of each cycle is defined by the start/stop
events described above, or a fixed length frame duration. Periodic
operation is terminated by software command, preset time of day, or
simply specifying the number of cycles to process.
A GPIO header provides separate hardware trigger connections for
each channel. The trigger source used by each datapath is software
selectable. A 50 ohm terminated coaxial input offers a second
trigger source that provides controlled impedance through the cable
interconnect. The coaxial trigger is standard on the two channel
configuration (RX2
The Model 271 monitors both power consumption and temperature
during normal operation. Current measurements are available on all of
the primary voltage supplies. Temperature sensors monitor the DSP die
temperature, ADC die temperature, and four other locations on the card.
A DMA engine assigned to each channel manages data transfers
between the PCIe controller and host memory. The DMA engine
allows the receiver to automatically initiate a PCIe burst transaction
when data needs to be transferred. High performance DMA techniques
are supported by both the hardware and software to optimize data
transfer efficiency. Memory fragmentation problems are eliminated by
supporting thousands of scatter-gather DMA buffers in host memory.
The progress of DMA transfers is tracked by polling the hardware
or monitoring interrupts. The spacing of interrupts is variable, they
are programmed to fire when the desired number of DMA pages are
refreshed. The SigStream product includes an interrupt timer function
to measure the response time of the host. This is used to establish
an optimum interrupt frequency that will not overwhelm the software.
Demonstration software is provided with the hardware to quickly
establish a path to end-user application code. The API is supported
with drivers for Windows™, Linux, or VxWorks operating systems.
Model 271
Specification Summary
Receiver Performance
Preliminary characteristics:
Full power (3 dB) bandwidth: 650 MHz
SNR: 73 dB (First Nyquist typical)
SFDR: 90 dBc (First Nyquist typical)
Channel isolation: 80 dB (typical)
Phase noise: -100 dBc/Hz (10 kHz offset)
Internal reference: 10 MHz +/- 1.0 ppm
Digital Down Converter
29.8 Hz tuning resolution (Fs = 250 MHz)
Full Nyquist output bandwidth (BW)
Octave sub-bands (BW/2N, N = 1 to 10)
Hardware
Format: XMC, CCXMC, half-length PCIe
PCIe: x4 or x8 Gen 2
GPIO: 6-bit LVTTL or 3-bit LVDS
Selectable internal or external sample clock
Selectable internal or external reference
Coaxial trigger (50 ohm terminated)
GPIO triggers (50 ohm terminated option)
Power dissipation: 15 Watts
Software
Adapter driver: Linux, Windows, VxWorks
SigStream application example
Build Options
Synthesizer frequency:
250 MHz (Maximum ADC specification)
213.33 MHz (160 MHz IF sampling)
Programmable (Degraded phase noise)
Conformal coat for harsh environments
Typical Applications
Multi-channel signal acquisition
High speed instrumentation
Signal intelligence (SIGINT) collection
Software defined radio
Signal recorder
Red Rapids
797 North Grove Rd, Suite 101
Richardson, TX 75081
Phone: 972-671-9570
Fax: 972-671-9572
www.redrapids.com
Red Rapids reserves the right to alter product specifications or discontinue any product without notice. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement. This product is not designed, authorized, or warranted for use in a life-support system or
other critical application. All trademarks and registered trademarks are the property of their respective owners. (© 2013 Red Rapids, Inc.)
SLK-271-000-R00
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