The AD5700/AD5700-1 data sheet states that specifications apply to both A and B models ( i.e. "all specifications are from -40°C to +125°C and relate to both A and B models, unless otherwise noted"), but I'm unable to ferret-out what distinguishes between…
What is the difference between the AD5700 & AD5700-1 products?
Can the AD5700/AD5700-1 support Full Duplex Operation?
HART is, by nature, half duplex. It uses one channel (one pair of wires) for both directions. If one side is transmitting…
As implemented in the AD5700/AD5700-1 devices, the /RTS (Request To Send) digital input covers the two cases of:
I'm not finding any input specification (or application examples) for the HART_IN pin that implies its input z and/or bias current requirements. Specifically, I'm wanting to use the part's internal filter option and am undecided how to apply protection…
What are the key features of the AD5700 & AD5700-1 HART Modem products?
I use EVAL-AD5700-1EBZ to connect to RSET of EVAL-AD5422LFEBZ based on the description in the section 'Circuit Evaluation & Test' in the following page.
I designed the circuit based on CN0278 and replaced AD5422 LFCSP version with TSSOP version.
AT HART_OUT pin, I can observe 500mVp-p signal, but at RSET pin, the signal is attenuated a lot and
the signal only has 50mVp-p swing. Judging from the CN0278…
With the duplex pin asserted, /RTS @ ground, and HART_OUT connected to HART_IN, CD will be high.
This FAQ on the duplex mode of the AD5700/AD5700-1 may also be of interest to you:
FAQ: AD5700/AD5700-1 & Full Duplex Operation
I am not achieving the 1.71V minimum supply voltage specified for the AD5700-1.
The lowest I can achieve is 1.83V while the device is still outputting a modulated signal. Any lower (1.827V) and the signal disappears completely. This is measured at the…