ADR5040/ADR5041/ADR5043/ADR5044/ADR5045

Rev. A | Page 12 of 16

Adjustable Precision Voltage Source

The ADR5040/ADR5041/ADR5043/ADR5044/ADR5045,

combined with a precision low input bias op amp such as the

AD8610, can be used to output a precise adjustable voltage.

Figure 22 illustrates the implementation of this application

using the ADR5040/ADR5041/ADR5043/ADR5044/ADR5045.

circuit, which is completely dependent on the resistors, R1 and R2.

An additional capacitor, C1, in parallel with R2, can be added to

filter out high frequency noise. The value of C1 is dependent on

the value of R2.

AD8610

GND

R1

R2

C1

(OPTIONAL)

ADR5040/ADR5041/

ADR5043/ADR5044/

ADR5045

Figure 22. Adjustable Voltage Source

Programmable Current Source

By using just a few ultrasmall and inexpensive parts, it is possible

to build a programmable current source, as shown in Figure 23.

The constant voltage on the gate of the transistor sets the current

through the load. Varying the voltage on the gate changes the

interface, and the AD8601 is a precision rail-to-rail input op

amp. Each incremental step of the digital potentiometer increases

or decreases the voltage at the noninverting input of the op amp.

Therefore, this voltage varies with respect to the reference

voltage.

AD8601

V+

V–

AD5247

ADR5040/

ADR5041/

ADR5043/

ADR5044/

ADR5045

Figure 23. Programmable Current Source