Sig56-2 Low-Cost Measurement Board

(This board currently not available)

Sig56-2 Low-Cost Measurement Board

The Sig56-2 makes DSP-based data acquisition, measurement functions such as spectrum analyzer, stimulus & response, and distortion calculation, and basic real-time DSP algorithms truly affordable. The board itself costs USD 349, and can be combined with Signalogic software under certain circumstances for less than USD 500 for universities and less than USD 1000 for commercial sites.

The Sig56-2 combines a Motorola 40 MHz DSP56001 24-bit fixed-point DSP, 32k x 24 3-wait state SRAM, and two (2) channels of simultaneously sampled analog input and output on a 7.5" PC plug-in board. Each channel contains 16-bit sigma-delta A/D and D/A converters with typical dynamic range about 92 dB. The sigma-delta technology gives each channel automatic anti-aliasing and reconstruction filters which track with the programmable sampling rate, and nearly ideal out-of-band rejection and linear phase. Sampling is synchronous, and rates range from 11.025 kHz to 44.1 kHz; software filtering and decimation can be used to achieve lower sampling rates. The Sig56-2 is fully supported by Hypersignal-Macro, and DirectDSP software.

Sig56-2 Feature Summary

• 40 MHz DSP56001

• 32k x 24 3-ws SRAM

• 2-channel 16-bit sigma-delta analog I/O with typical dynamic range of 92 dB

• 7.5" x 4.25" compact size (XT style form factor)

Sig56-2 Specifications and Data Sheets

• Data Sheet for Sig56-2 (58 KB)

• A/D Converters (Crystal Semiconductor CS5336)(698,318 Bytes)

• D/A Converters (Crystal Semiconductor CS4328)(851,749 Bytes)

Sig56-2 Software Support

The Sig56-2 is fully supported by Signalogic's Hypersignal®-Macro and Hypersignal-Acoustic software packages. In addition, both the board and Hypersignal packages can also be used with DirectDSP, which offers C/C++, Visual Basic, and MATLAB® programming interfaces.  Used in conjunction with the Sig56-2, the RTC/Hypersignal software combination provides sophisticated DSP-based instrumentation, visualization and display of waveforms, block-diagram based automation of development and test sequences, and numerous tools for all levels of DSP product, system, and algorithm development. The complete range of DSP/math functions, interactive waveform display and editing, difference equations, filter design, and real-time code development facilities offered by the software is fully active with the Sig56-2. Display examples include interactive frequency domain waterfall and contour (joint time-frequency), .WAV display, pole-zero, unwrapped phase, and group delay.

Signalogic software takes full advantage of the analog I/O capability of the Sig56-2. Instruments and waveform file record/playback are single- or dual-trace. Instrumentation includes digital oscilloscope, real-time spectrum analyzer, continuous signal generator, stimulus & response measurement, digital tape recorder, and more. The spectrum analyzer allows measurements such as transfer function (deconvolution), impulse response, and selective-band real-time digital filtering to be performed. For acoustic/audio measurement and analysis functions and information in particular, see Hypersignal-Acoustic software.

Additionally, the DSP5600x DSP Source Code Interface allows real-time code to be designed, simulated and developed for the DSP56001, and results downloaded, tested and graphically debugged in real-time with the Hypersignal and RTC packages.