I have been looking for a usb scope/function gen/logic analyzer and this is
just that and a whole lot more. Does the software decode spi, i2c etc.?
CheersIanV
On Monday, 3 April 2017, 11:21, Nick <[email protected]> wrote:
As I'm having to build a table-top-workshop here from scratch (can't denude my
workshop back in the UK), I've been trying out some of the nice USB-based tools
you can now get...
Just received an Analog Discovery 2 unit for $279 -
http://store.digilentinc.com/analog-discovery-2-100msps-usb-oscilloscope-logic-analyzer-and-variable-power-supply/
- Farnell have them for about GBP 220
http://uk.farnell.com/digilent/410-321/oscilloscope-usb-2-ch-30mhz-100msps/dp/2528523
.
This is an interesting bit of kit - it's a cooperation between Analog Devices
(who do all the signal conditioning and interfacing) and Xilinx, who do the
logic, but put together by Digilent, who sell Xilinx development systems...
Initially just a reference design, i.e. a technical paper, they realised that
they had something pretty neat on their hands, so made it a product.
The design has turned into a really cool bit of kit at a very acceptable price
- a full design rationale is available as are all the schematics etc. in the
reference manual (also on the Farnell page). Its a really nice unit... Two
programmable supplies, 2 waveform generator channels, 16 logic channels. Lots
of analog too. 14-bit A/D/A as well, not the usual 12-bit...
Very few compromises have been made - by using 14-bit DACs and ADCs, it
compares very favorably with far more expensive units. The software is also
extremely stable.
As a small unit to keep with the laptop, there's not a lot to argue about... I
keep mine with the laptop at all times. The wiring harnesses are only $10/each,
so I leave those attached to the boards I'm working on - the WaveForms (free)
software has the concept of projects which contain the configurations of all
the devices on the AD2 that you are using for each setup, so switching boards
takes literally a minute (or less).
I was using it on the flight from the UK back to the UAE last week - I had my
laptop out, a Texas Instruments MSP-EXP430FR5969 development board and the
Analog Discovery - 6 hours of uninterrupted development time - USB-powered dev
environments are wonderful. No problems from other passengers or the crew - I
told the steward in advance I was an EE and that I'd be working on the 'plane -
I also made sure to keep any blinking LEDs concealed
I also have the probe expansion board - just sooooooo cute!
- Two-channel USB digital oscilloscope (1MΩ, ±25V, differential, 14-bit,
100MS/s, 30MHz+ bandwidth - with the Analog Discovery BNC Adapter Board
- Two-channel arbitrary function generator (±5V, 14-bit, 100MS/s, 12MHz+
bandwidth - with the Analog Discovery BNC Adapter Board
- Stereo audio amplifier to drive external headphones or speakers with
replicated AWG signals
- 16-channel digital logic analyzer (3.3V CMOS and 1.8V or 5V tolerant,
100MS/s)
- 16-channel pattern generator (3.3V CMOS, 100MS/s)
- 16-channel virtual digital I/O including buttons, switches, and LEDs –
perfect for logic training applications
- Two input/output digital trigger signals for linking multiple instruments
(3.3V CMOS)
- Single channel voltmeter (AC, DC, ±25V)
- Network analyzer – Bode, Nyquist, Nichols transfer diagrams of a circuit.
Range: 1Hz to 10MHz
- Spectrum Analyzer – power spectrum and spectral measurements (noise floor,
SFDR, SNR, THD, etc.)
- Digital Bus Analyzers (SPI, I²C, UART, Parallel)
- Two programmable power supplies (0…+5V , 0…-5V). The maximum available
output current and power depend on the Analog Discovery 2 powering choice:
...250mW max for each supply or 500mW total when powered through USB
...2.1W max for each supply when powered by an auxiliary supply. 700mA maximum
current for each supply.
As of March 17th, they have also released a fully-fledged logic analyser
version, the Digital Discovery for $199 -
http://store.digilentinc.com/digital-discovery-portable-logic-analyzer-and-digital-pattern-generator/
.
This is an up to 800MHz multi-channel logic analyser & pattern generator for
peanuts.
Nick
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