Interfacing Eval AD7675 EDZ without the EVAL-CED1Z - Page 1
Forum section: electronics / projects

author: Overspeed
author_rank: Frequent Contributor
timestamp: October 30, 2023, 02:06:05 pm
content: HelloDoes it possible to know if that possible to interface a Eval AD7675 EDZ or EVAL-AD7794EBZ ( quite cheap ) by using the SPI data link without to be force or avoid to use a solution base on the costly EVAL-CED1ZThe purpose is to connect or try to connect this board to a PC , just need to know if that possible and with which interface ? FDTI cable works as the C232HM-EDHSL-0 as this cable convert SPI to USBRegardsOSThe

author: ace1903
author_rank: Regular Contributor
timestamp: October 30, 2023, 02:19:47 pm
content: I have used product from Mikroelektronika USB SPI CLICK:https://www.mikroe.com/usb-spi-clickto test slow ADCs and SPI EEPROMS.But for AD7675 is not fast enough.

author: Overspeed
author_rank: Frequent Contributor
timestamp: October 30, 2023, 03:22:54 pm
content: HelloThanks that can be a solution for low SPS board as 24 bits for temperature or scale ( strain gages )RegardsOS

author: moffy
author_rank: Super Contributor
timestamp: October 30, 2023, 09:30:41 pm
content: The NXP, LPC43xx has an SGPIO function that can be configured for SPI and its I/O is quite fast, as well as USB, could be suitable.

author: Overspeed
author_rank: Frequent Contributor
timestamp: November 03, 2023, 08:49:03 pm
content: @MoffyThanks , my purpose is to built a affordable both in time and money data acquisition board for a portable ( transportable ) system for strain gage lab testing . one hight speed 16 bits 2 or 4 channels 250 KHz and one in 24 bits with sample rate in the 1000 as that to control tension on boltsI plan to use available ''cheap '' eval board from Analog device with SPI as SPI is quite asy to program ( I an not an expert in soft writing )Analog propose a solution base a clone of Arduino and some interesting boardhttps://www.analog.com/en/design-center/evaluation-hardware-and-software/evaluation-development-platforms/linduino.htmlthere is also a solution by using a direct USB converthttps://www.analog.com/media/en/technical-documentation/user-guides/dc590bf.pdfbut Analog propose ( 70 USD on Mouser ) a batch of Eval board with SPI output , I just don't want to pay $$$$ interface board with high performance FPGA to use these Eval board just to communicate with a ADC even if most ADC need to be set regarding parameter. This away allow to use low noise 24 bits ADC from Analog .So I continue to investigate , Analog board with DC590 USB with DC1908A-H can be a solution as PScope from Analog request a 400 USD board which is over the allowed budget .RegardsOS

author: moffy
author_rank: Super Contributor
timestamp: November 04, 2023, 01:23:09 am
content: Quote from: Overspeed on November 03, 2023, 08:49:03 pmThe Analog USB to SPI is only FULL speed USB which is 12Mbits/s at full rate but you most probably won't get that, you might find that restrictive for your purposes. You also have to deal with timing reads from the ADC, they can be quite particular about start and stop times, at 250kHz you need something pretty fast either a really good micro or FPGA.

author: moffy
author_rank: Super Contributor
timestamp: November 04, 2023, 02:41:06 am
content: perhaps the :https://diolan.com/dln4m