Analog Discovery is the latest analog circuit design kit for Digilent, integrated oscilloscope, signal generator, logic analyzer and other functions. This kit is jointly developed by Digilent and Analog Device, hoping to establish a distributed laboratory through this kit, replacing expensive dedicated instruments in the teaching field, and provide a supporting analog accessories kit and a variety of Teaching materials, reference design and experimental projects, etc., can have strong support for those core engineering education courses.
From the information from the Digilent website, the performance of the kit can be able to point: two differential analog inputs, with 14-bit resolution, 100MSPS sampling rate and 5MHz analog bandwidth (slightly low), each channel can store the largest 16K sampling point; dual-channel, 14-bit, 125MSPS sample rate single-end DA, working at 100MSPS rate; 16 channel 100MSPS digital I / O, depth per channel 4K, each channel can be arbitrarily configured to logic input or output.
Seeing these parameters has been slightly moving, and after the kit, the rabbit immediately conducts experiencing test.
The content of the Analog Discovery kit is very simple, a USB virtual instrument, data cable, DuPont line, or even a data disc, software and design information need to be downloaded from the Internet. Its supporting software Digilent WaveForms is only 16.9 MB size, and today's tool software is hundreds of MB, making the rabbit can't help but think of "simple".
The figure below shows the contrast photo of Analog Discovery and Raspberry Pi, very portable.
As with the general virtual instrument, Analog Discovery also uses a USB interface, and has a headphone jack, supporting a variety of modulation mode outputs such as AM, FM.
The other end of the device is 2.54mm pin, used to connect to the device or experimental circuit through DuPont line, from left to right, oscilloscope input, power output, signal generator, trigger input and digital I / O.
First install Waveform software before using the device, the software can be downloaded at http://www.digilentinc.com/waveforms, other design resources of Discovery can also be obtained through the Digilent website.
After installing the Waveform software, connect the device and the PC using the USB cable, and the system will be installed for Discovery. After running Waveform, the software automatically identifies the device and enters the main interface. From the interface, you can see the operation information of the device itself. The monitoring data shows that the power supply is 5V-400mA, the power consumption is only 2W but is also close to the single-port USB, and it will feel the case after a period of time. . The main features provided by Waveform include both analog and numbers. Let's try these features in turn.
For the performance of a peek device, the rabbit will take the tool of the bus debugger, connect the two oscilloscope channel to connect the I2C of the debugger, and go up. I didn't expect to have discovered a suspected bug in the suite. The rabbit debugger used the CP2102 USB-TO-UART chip (PC automatically assigned a COM number), and Analog Discovery also identified as a USB-TO SERIAL device (no COM number), as a rabbit When the rabbit uses the Secure CRT connection to the debugger, WAVEForm directly reports the error, which looks off the ANALOG Discovery to connect with the CP2102 connection. Sad reminder, can only turn off the SCRT and then open Waveform.
The first is the oscilloscope function, and the GUI is still a medium-regulatory medium, there is no fancy display effect, and the function provided is also full.
Due to the high-precision 14-bit AD, the measurement value of the voltage has a certain reference significance. Regardless of the horizontal axis and longitudinal axis support maximum minimum and flat mean measurements, except for the basic time parameters such as frequency, cycle, even supports the measurement of the rise time, is indeed rare.
The effect of the persistence (persistence) is a bit similar to the eye map in the advanced oscilloscope, and the distribution time of the signal in different positions can be learned according to the change in color, and this result is obtained according to the long time.
Histogram functionality reflects the distribution of energy and can also be used to analyze jitter.
The device also supports real-time FFT, and the FFT output is still relatively smooth according to the use, and the yellow curve is a spectral of 100K BPS I2C bus.
The waveform is enlarged, and it feels that the capture of the waveform details is still better. The following is the impact of the I2C SCL signal (yellow) to the SDA signal (blue), this effect is seen in the I2C and SPI of STM32. It is not known that it is crosstalk caused by IC or PCB wiring.
In addition, the oscilloscope also supports some common signal operations, digital mold mixing, etc., which are sufficient to take a certain teaching task.
The introduction of the wave is then the signal generator, which has a standard sine wave, square wave, triangular wave, random noise, etc., standard boxing supports 20kHz frequency, 0-5V amplitude and ± 5V offset. Because the rabbit does not have an oscilloscope, take the oscilloscope function in Waveform to self-test.
The figure below is the 20kHz random noise generated by the signal generator. Although according to the rabbit speculation, it should be a pseudo-random, but the general experiment is also available.
The signal generator generates a waveform through the WAV and CSV format files, and the figure below is a waveform output of a WAV sound file comes with a WIN7.
Of course, if you can only create a fixed waveform called the signal generator, you must be able to draw themselves, the rabbit is here to paint LM two letters with the mouse.
Output effect, it is quite interesting.
In addition, the signal generator also supports sweeping, composite modulation, etc., the highest frequency of sweep and modulation is 10MHz, and has a variety of adjustable parameters. At this point, the rabbit decided to recover the word "simple", WAVEForm's simulation input and output function is very complete, which can meet most entry-level electronic applications.
In addition to oscilloscopes and signal generators, there is a ± 5V power source, nominally can output 60mA current, and the actual method is turned off when the current of the entire device exceeds 600mA. This power is compared with the chicken ribs, which can only be used for low-power circuits and some passive networks. The rabbit wants to test the output waveform of a gas sensor, resulting in overcurrent protection, and there is only other power sources to power the target board. The figure below is to power the MCU core board, compare the no-load information, increasing the flow consumption of 70 mA.
Digital part, the function of the logic analyzer is relatively simple, the interface is also very simple, supporting multiple data display formats and trigger mode, and integrates some communication protocols. Below is some timing of the I2C bus to write the 0x58 address.
Unfortunately, only the communication protocols can only be analyzed in parallel bus, SPI, I2C, and UART timings, which are more thin if it is possible to support the form of a custom communication protocol in the form of MOD or script extensions.
Trigger, support level trigger, rising edge trigger, falling edge trigger and biard trigger.
100 buffers of the logic analyzer, 4K sampling points per channel.
Since there is no address of 0x58 on the bus, there is no SLAVE response, and the master reacts the address after the timeout, where the logic analyzer detects an ACK error and prompt Error.
Compared to logic analysis functions, digital mode generators are still user-friendly, in addition to some fixed and random waveforms that support custom protocol waveforms, can be imported through the CSV file or generated by manual editing.
Static I / O functionality can be displayed or changed in a variety of forms, and supporting multiple graphics effects, the LEDs below can also become button (self-locking or non-self-locking), as well as three states, OD switches, etc. .
The software can even convert a set of I / O into seven paragraphs :).
In addition, WAVEForm also integrates a ± 25V range, accurate to the fourth bit of effective value, and outputs two valid values, and a network analyzer capable of measuring the portrait, but unfortunately there is no right in the rabbit. The network can be used to measure, and the advanced function has been used in hand cramps, so I am interested in friends who look at Measuring Loudspeaker Resonance under the Digilent's Analog Discovery page, or simply collect one home ~~
The Analog Discovery Simulation Kit provides a good alternative to the experimental course of the engineering school, integrating the function of oscilloscopes, signal generators, and logic analyzers, providing a good helper for student handling circuit experiments. And Analog Discovery is very portable, easy to use and maintain, Digilent also offers a wealth of supporting tools and design resources, which is undoubtedly more advantageous relative to expensive and maintenance experiments in universities. Analog Discovery Simulation Kits can also be used as a portable three-in-one virtual instrument. At present, the price of the Analog Discovery Kit is 1980, and universities or education research institutions can apply for academic prices, only 1580 yuan.
Reference link
Decomposition Analog Discovery, exquisite materials
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Original declaration: This article is originally created by the panel network, declined!
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