![]() ![]() I'd also be interested in the isolated ADC part driving a decent length cable so the DAC part can sit at some distance to it - this would allow you to digitize at source rather than degrade the analogue signal by having this transmitted to the "converter". At least start off with a methodology that stands a chance of working and is easily modified to suit different ADCs and DACs. I think that trying to do it without a micro controlling to the DAC could hit problems. This could be transmitted thru a simple magnetic coupler (as per a lot of the ADI isolation devices) and you could decode the serial stream using the "gap" like the stop bits in an async serial stream with a small cheap microprocessor. If I needed an analogue signal isolator like this I'd choose a serial output ADC that could run continuously, possibly from a local clock generator that also generated a conversion pulse. Wholesale Trader of Signal Isolators & Converters - Signal Converter ( Current Transducer), Masibus Signal Isolator 9000u, P&F Isolators ( KFD2-CR4-1.20 ) UPDATED To KCD2-STC-1.20 and Signal Isolators offered by Synergy Automation, Delhi. Conversion throughput of around 100ksps would be sufficient.Resolution should be between 10 and 16 bit, no specific value is required. ![]() The ADC will be powered on the 'dirty' side so there is complete isolation, only the data/conversion control signals need to pass through the isolation barrier.Not tied to I2C, SPI would be appropriate too.Would sending the clock over the digital isolator be a bad idea? If the digital isolator was many times faster than the clock would it have a negligible effect in terms of delay? I'm assuming I can send the data line (SDA) through the digital isolator but to synchronise the ADC and DAC they would need a common clock signal. Keeping both sides isolated is pretty vital and I'm wondering how this will effect the ADC and DAC linking. Possible components include TI ISO7420FEDR and Analog Devices ADUM1200ARZ. There are a few ways to approach this but I am currently pursuing the solution as seen below:ĪDC and DAC are being proposed as Microchip MCP3221 and MCP4725 respectively.Ī digital isolator would give a smaller footprint than an opto-isolator with its accompanying components and would provide much greater performance. The input will be of the 4-20mA range (1-5V). I'm looking into isolating an analogue input coming from field equipment and interfacing to a PLC analogue input module. ![]()
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