ADR130BUJZ-R2 datasheet(14/16 Pages) AD

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ADR130

Rev. 0 | Page 14 of 16

NEGATIVE PRECISION REFERENCE WITHOUT

PRECISION RESISTORS

A negative reference is easily generated by adding an op amp,

A1, and is configured as shown in Figure 36. VOUT is at virtual

ground and, therefore, the negative reference can be taken

directly from the output of the op amp. The op amp must be

dual-supply, low offset, and rail-to-rail if the negative supply

voltage is close to the reference output.

GND

VIN

VOUT

SET

ADR130

+VDD

–VREF

–VDD

0.1µF

V+

V–

OP291

1kΩ

Figure 36. Negative Reference, −VREF = −0.5 V

PRECISION CURRENT SOURCE

In low power applications, the need can arise for a precision

current source that can operate on low supply voltages. The

ADR130 can be configured as a precision current source (see

Figure 37). The circuit configuration shown is a floating current

source with a grounded load. The reference 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 supply current,

typically 85 μA, to approximately 4 mA.

GND

VIN

VOUT

SET

ADR130

RSET

VIN

Figure 37. ADR130 as a Precision Current Source

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