REF3012, REF3020, REF3025, REF3030, REF3033, REF3040

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APPLICATION INFORMATION

Application Information

A supply bypass capacitor of 0.1

mF is recommended.

In most applications, the REF30xx does not require an

output bypass capacitor. For the effects of a capacitive load

on device performance, see Figures 8 and 9 in the Typical

Characteristics section.

Power Supply

The REF30xx family of references works at supply

voltages between 2.7 V and 5.5 V. The maximum dropout

voltage in this range is 2.5 mV.

While the power supply voltage rises to the specified level

during power−up, the REF30xx will temporarily draw a

higher than typical current. It is recommended to use a

power supply with a fast rising edge.

Line Regulation

Line regulation is defined as the change in output voltage

due to the change in the input voltage. For REF30xx, this

voltage range.

Thermal Hysteresis

Thermal hysteresis is defined as the change in the output

voltage after the device is cycled through the operating

temperature range. This change is reported as a fraction of

is measured at 25

°C. After the device is cooled to −40°C,

heated to +80

°C, then cooled back to 25°C, the final output

to

(eq. 1)

Temperature Drift

Temperature drift is defined as the change in the output

voltage caused by a change in operating temperature. (See

Figure 2 in the Typical Characteristics section.) The

REF30xx family is designed to exhibit a temperature drift of

less than 50 ppm/

°C across its entire operating temperature

range of −40

°C to +85°C.

Noise Performance

The noise generated by the REF30xx family is typically

less than 50

mVp−p between frequencies of 0.1 Hz to 10 Hz,

as shown in the Typical Characteristic Curves. Output noise

can be additionally reduced using a low−pass filter, although

care should be taken, as capacitive loads affect the PSRR and

the output impedance. (See the Typical Characteristics

section.)

Load Regulation

Load regulation is defined as the change in output voltage

due to a specified change in load current. The REF30xx

family can sink or source up to 10 mA of current, with an

output change of less than 250

mV/mA when sourcing, or

350

mV/mA when sinking current.