REF3012, REF3020, REF3025, REF3030, REF3033, REF3040
http://onsemi.com
6
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
change is less than 100
mV/V across the specified supply
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
the nominal output voltage, in ppm. The initial output V
PRE
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
voltage V
POST
is measured. The thermal hysteresis is equal
to
T
h
HYST +
Ť
V
PRE
* V
POST
Ť
V
NOM
@ 10
6
(ppm)
(eq. 1)
where V
NOM
is the nominal output voltage.
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.
