AD7111LN

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AD7111LN Application Field and Working Principle

AD7111LN is generally categorized as a Digital-to-Analog Converter (DAC) in the field of data acquisition, used to program the value of an analog reference voltage, determined by an external resistor divider. The AD7111LN is a flexible device that can be used for a wide variety of applications: from providing reference voltage for power supplies to down-stream system components, to actuating sensors to controlling motor speed, to controlling light sources for optical systems.

The AD7111LN can operate in one of three modes: unipolar, bipolar, and parallel. In unipolar mode, it outputs a unipolar analogue reference voltage, ranging from 0 V to Vdd. In bipolar mode, it outputs a bipolar analogue reference voltage, ranging from - Vdd/2 to + Vdd/2. Finally, in parallel mode, it outputs 16 discrete analogue reference voltages, which are equally spaced between 0 V and Vdd.

The AD7111LN operates on a supply voltage ranging from 4.75 V to 5.25 V and is capable of sinking or sourcing up to 600 µA of output current. It also features low power operation, with quiescent current of only 0.35 µA and operating current of only 1.5 µA, as well as built-in temperature compensation to ensure high accuracy performance.

The working principle of the AD7111LN is based on comparing the voltage at the output of a two-stage resistor divider, which is proportional to the internal programming word, to the voltage from an external reference. A resistor divider is used to adjust the voltage present at the Voltage Adjust pin. The voltage present at the Voltage Adjust pin is compared to the internal reference voltage and a comparator output indicates the comparison result.

The AD7111LN is also designed to be used with external capacitors to provide filtering and noise suppression. An external capacitor is place between the Voltage Adjust pin and Vdd. The capacitor’s value should be selected such that its time constant is slightly larger than the maximum time required to switch the output between two voltage levels. A capacitor should also be connected between the VREFC pin and Vdd to provide further filtering and better noise immunity.

The AD7111LN’s operation is further enhanced by several features that are unique to this device: a power-down pin that enables low power operation, an internal switch for driving the output to a low impedance state, and an internal temperature compensation for better performance over a wider temperature range.

In conclusion, the AD7111LN is a versatile device that is capable of providing accurate and adjustable analogue reference voltages for a wide range of applications. Its features make it ideal for powering down-stream system components, actuating sensors, or controlling motor speed and light sources for optical systems. It operates on a supply voltage of 4.75 V to 5.25 V and is capable of sinking or sourcing up to 600 µA of output current, while also offering low power operation with quiescent current of only 0.35 µA and operating current of only 1.5 µA.

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