sushant_21
Junior Member level 3
HI,
this is sushant, i had designed a circuit for client to read analog input, using ADS1118 IC, the circuit was design to read 4-20mA,0-5V and 0-200mV.
Now the requirement has been changed and new input is added which is 10uA-30uA.
i had designed circuit as 4-20mA/0-5V to Channel 0 of ADC and 0-200mA to Channel 1 of ADC.
ADC has Programmable gain amplifier, which helps me to adjust Full Scale range to ±0.256 V , that gives me .256/32768, as 1 digit = 7.81uA, but if i use this, there will be very less Digital Value.
i have added our input schema, please kindly lemme now the improvement or guide me in this.
View attachment ADC_input485.pdf
Regards
Sushant
this is sushant, i had designed a circuit for client to read analog input, using ADS1118 IC, the circuit was design to read 4-20mA,0-5V and 0-200mV.
Now the requirement has been changed and new input is added which is 10uA-30uA.
i had designed circuit as 4-20mA/0-5V to Channel 0 of ADC and 0-200mA to Channel 1 of ADC.
ADC has Programmable gain amplifier, which helps me to adjust Full Scale range to ±0.256 V , that gives me .256/32768, as 1 digit = 7.81uA, but if i use this, there will be very less Digital Value.
i have added our input schema, please kindly lemme now the improvement or guide me in this.
View attachment ADC_input485.pdf
Regards
Sushant