SBOS375D October 2006 – October 2024 XTR111
PRODUCTION DATA
Refer to the PDF data sheet for device specific package drawings
The XTR111 does not provide internal circuits to generate 4mA with 0V input signal. Figure 7-3 shows that the most common way to shift the input signal is a two-resistor network connected to a voltage reference and the signal source. This arrangement allows easy adjustment for overrange and underrange conditions. The example assumes a 5V reference (VREF) that equals the full-scale signal voltage and a signal span of 0V to 5V for 4mA-to-20mA (IMIN to IMAX) output.
The voltage regulator output or a more precise reference can be used as VREF. Observe the potential drift added by the drift of the resistors and the voltage reference.