Third-generation 4-20mA transmitters (Figure 2) are considered “smart and intelligent.” They add to the smart transmitter a capability for digital communications, which share the twisted-pair line ...

This current flows through R3 and is amplified, via the op amp configuration, through R4 to form the 4-20mA output. As the current consumed by the entire transmitter returns through R4, it is included ...

The addition of an integrated high voltage LDO and power sequencing capability simplifies the power up of the 4-20mA sensor transmitter. Maximum current consumption is 250uA. The chip saves cost by ...