The AMC1306M25E is designed for shunt-based current-sensing applications where accurate current monitoring is required in the presence of high common-mode voltages.

Figure 8-1 shows the AMC1306M25E in a typical application. The load current flowing through an external shunt resistor RSHUNT produces a voltage drop that is sensed by the AMC1306M25E. The AMC1306M25E digitizes the analog input signal on the high-side, transfers the data across the isolation barrier to the low-side, and outputs the digital bitstream on the DOUT pin. The 5-V high-side power supply (AVDD) is generated from the floating gate driver supply using a resistor (R4) and a Zener diode (D1). The 49.9-Ω resistor on the DOUT pin is used for line-termination and improves signal integrity on the receiving end.

The differential input, digital output, and the high common-mode transient immunity (CMTI) of the AMC1306M25E ensure reliable and accurate operation even in high-noise environments.

Figure 8-1 Using the AMC1306M25E for Current Sensing in a Typical Application