ADR366B datasheet(18/20 Pages) AD

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ADR360/ADR361/ADR363/ADR364/ADR365/ADR366

Rev. A | Page 18 of 20

General-Purpose Current Source

Many times in low power applications, the need arises for a

precision current source that can operate on low supply

voltages. The ADR36x can be configured as a precision current

source (see Figure 36). The circuit configuration illustrated is a

floating current source with a grounded load. The reference’s

output voltage is bootstrapped across RSET, which sets the output

current into the load. With this configuration, circuit precision

is maintained for load currents ranging from the reference’s

supply current, typically 150 μA, to approximately 5 mA.

GND

VIN

ADR36x

TRIM

VOUT

ISY

ISET + ISY

ISET

+VDD

RSET

Figure 36. Precision Current Source

Trim Terminal

The ADR36x trim terminal can be used to adjust the output

voltage over a nominal voltage. This feature allows a system

designer to trim system errors by setting the reference to a

voltage other than the standard voltage option. Resistor R1 is

used for fine adjustment and can be omitted if desired. The

resistor values should be carefully chosen to ensure that the

maximum current drive of the part is not exceeded.

+VDD

GND

VIN

ADR36x

TRIM

VOUT

100k

POT

10k

Figure 37. ADR36x Trim Configuration

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