Does somebody have tried to build 4-20mA converter using IC DAC0832 (datasheet on page 20)...?
I have been build it but its not working. I was test the input data by SPST toggle switches to ground but the output always 18.9mA (single supply 12vdc 500ma) although switch has changed (0...255).
I could not find the 92PE37B transistor in my country so i changed to 2sc4408.
I put digital ampere meter instead of "ext sense resistor" to measure the 4 to 20mA. Supply is 12vdc 500ma for output 18.9mA. and
Supply is 16vdc 500ma for output 25.3mA.
I put digital ampere meter instead of "ext sense resistor" to measure the 4 to 20mA. Supply is 12vdc 500ma for output 18.9mA. and
Supply is 16vdc 500ma for output 25.3mA.
I just follow the schematic in the datasheets on page 20. parallel Input connect to pins 3 and 10 (gnd) when logic is low (switch close/on) and floating when switch open(off).
I just follow the schematic in the datasheets on page 20. parallel Input connect to pins 3 and 10 (gnd) when logic is low (switch close/on) and floating when switch open(off).
I make it low. CS(PIN1), WR1(PIN2), WR2(PIN18) and XFER(PIN17) are connected to ground of DAC (PIN3 & 10). I have replaced ic dac0832 with new one but the result still same ( output is 18.9mA).
I make it low. CS(PIN1), WR1(PIN2), WR2(PIN18) and XFER(PIN17) are connected to ground of DAC (PIN3 & 10). I have replaced ic dac0832 with new one but the result still same ( output is 18.9mA).
Hi,
You cannot just wire the control pins to fixed voltage levels, you must switch the control pins as described in the d/s in order to load/latch the data into the DAC input buffers.