DIO2388A/B

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DIO2388A/B• Rev. 1.6

Typical Application

Figure 11. Input and output AC-coupling application

Figure 11 shows the basic connections for the DIO2388X. 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 QFN1.4*1.8-10 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 DIO2388X 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. Note also that

the DIO2388X can withstand the full –0.3 V to 26 V range in the input pins, regardless of whether the device has

power applied or not.

Selecting RS

The zero-drift offset performance of the DIO2388X 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.

The DIO2388X series of current-shunt monitors give equivalent accuracy at a full-scale range on the order of 10

mV. This accuracy reduces shunt dissipation by an order of magnitude with many additional benefits.

Alternatively, there are applications that must measure current over a wide dynamic range that can take

advantage of the low offset on the low end of the measurement. Most often, these applications can use the lower

gain of 100 to accommodate larger shunt drops on the upper end of the scale.

Unidirectional operation

Unidirectional operation allows the DIO2388X to measure currents through a resistive shunt in one direction. The

most frequent case of unidirectional operation sets the output at ground by connecting the REF pin to ground. In