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REF1112AIDBZR Schematic ( PDF Datasheet ) - Burr-Brown Corporation

Teilenummer REF1112AIDBZR
Beschreibung 10ppm/C/ 1UA/ 1.25V Shunt Voltage Reference
Hersteller Burr-Brown Corporation
Logo Burr-Brown Corporation Logo 




Gesamt 8 Seiten
REF1112AIDBZR Datasheet, Funktion
REF1112
10ppm/°C, 1µA, 1.25V
Shunt Voltage Reference
SBOS283 – SEPTEMBER 2003
FEATURES
z MICRO-PACKAGE: SOT23-3
z WIDE CURRENT RANGE: 1µA to 5mA
z HIGH INITIAL ACCURACY: 0.2%
z EXCELLENT SPECIFIED DRIFT
PERFORMANCE:
30ppm/°C (max) from 0°C to +70°C
50ppm/°C (max) from –40°C to +85°C
APPLICATIONS
z BATTERY-POWERED INSTRUMENTS
z PORTABLE DEVICES
z MEDICAL EQUIPMENT
z CURRENT SOURCES
z CALIBRATORS
z MICROPOWER CURRENT AND VOLTAGE
REFERENCE
DESCRIPTION
The REF1112 is a two-terminal shunt reference designed for
power and space-sensitive applications. The REF1112 fea-
tures an operating current of 1µA in a SOT23-3 package
and is an improved, lower power pin-compatible drop-in
replacement for designs currently using the REF1004 and
LT1004. The REF1112 is specified from –40°C to +85°C
with operation extending from –40°C to +125°C.
The REF1112 complements other 1µA components from
Texas Instruments including the OPA349 and the TLV240x
low power operational amplifiers, and the TLV349x
micropower voltage comparator.
IREF + ILOAD
IREF
VS
RBIAS
ILOAD
VOUT
RLOAD
RBIAS =
VS VD
ILOAD + IREF
VO 1
3 NC
GND 2
SOT23
NC indicates pin should be left unconnected.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright © 2003, Texas Instruments Incorporated






REF1112AIDBZR Datasheet, Funktion
For applications requiring a stable voltage reference ca-
pable of sinking higher than 5mA of current, a REF1112
combined with an OPA347 can sink up to 10mA of
current. This configuration is shown in Figure 5, and
through appropriate selection of R1 and R2, can be used
to provide a wide range of stable reference voltages. The
REF1112 is also useful for level shifting, and as shown in
Figure 6, can be used to achieve the full input range of
an ADC.
VS
RSET
IBIAS
2.5V
10k
R1
10k
1.25V
0.1µF
OPA347
R2
10k
0.01µF
VOUT = 1.25 (1 + R1 / R2)
FIGURE 5. Adjustable Voltage Shunt Reference
VS
VREF
VOUT
+ V 1.25V
0.1µF
VIN
V
FIGURE 6. REF1112 Provides a Level Shift to Achieve Full ADC Input Range.
ADC
6 REF1112
www.ti.com
SBOS283

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