DIO2399A/B

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DIO2399A/B• Rev. 1.7

Typical Application

Figure 7. Input and output AC-coupling application 1

Figure 8. Input and output AC-coupling application 2

Figure 7 shows the basic connections for the DIO2399X. The input pins, IN+ and IN–, should be connected as

closely as possible to the shunt resistor to minimize any resistance in series with the shunt resistance.

Power-supply bypass capacitors are required for stability. Applications with noisy or high-impedance power

supplies may require additional decoupling capacitors to reject power-supply noise. Connect bypass capacitors

close to the device pins.

On the QFN1.8*1.4-10 package, two pins are provided for each input. These pins should be tied together (that

is, tie IN+ to IN+ and tie IN- to IN-).

Power supply

The input circuitry of the DIO2399X can accurately measure beyond its power-supply voltage, V+. For example,

the V+ power supply can be 5 V, whereas the load power-supply voltage can be as high as 26 V. However,

the output voltage range of the OUT terminal is limited by the voltages on the power-supply pin.

Selecting RS

The zero-drift offset performance of the DIO2399X offers several benefits. Most often, the primary advantage of

the low offset characteristic enables lower full-scale drops across the shunt. For example, non-zero-drift

current shunt monitors typically require a full-scale range of 100 mV.