Figure 8-7 shows a circuit for a low-side, shunt-type current monitor. The circuit reads the voltage across a shunt resistor, which is sized as small as possible while still giving a readable output voltage. This voltage is amplified by an OPA333-Q1 low-drift operational amplifier, and the result is read by the ADS1000-Q1. The maximum voltage across the current shunt is 50 mV. This design uses a 5-V power supply.