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PDF REF1112 Data sheet ( Hoja de datos )
| Número de pieza | REF1112 | |
| Descripción | 10ppm/C/ 1UA/ 1.25V Shunt Voltage Reference | |
| Fabricantes | Burr-Brown Corporation | |
| Logotipo |  |
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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
1 page  
APPLICATIONS INFORMATION
The REF1112 is a two-terminal bandgap reference diode
designed for high accuracy with outstanding temperature
characteristics at low operating currents. Precision thin-film
resistors result in 0.2% initial voltage accuracy and 50ppm/°C
maximum temperature drift. The REF1112 is specified from
–40°C to +85°C, with operation from –40°C to +125°C, and is
offered in a SOT23-3 package.
Typical connections for the REF1112 are shown in Figure 1.
A minimum 1µA bias current is required to maintain a stable
output voltage and can be provided with a resistor con-
nected to the supply voltage. IBIAS depends on the values
selected for RBIAS and VS, and will vary as a sum of the
minimum operating current and the load current. To main-
tain stable operation, the value of RBIAS must be low
enough to maintain the minimum operating current at the
minimum and maximum load and supply voltage levels.
VS
1µF
RBIAS
0.1µF
IBIAS = IREF + ILOAD
VREF
ILOAD
IREF
IBIAS
=
VS - VREF
RBIAS
FIGURE 1. Typical Connections.
A 0.1µF load capacitor is recommended to maintain stabil-
ity under varying load conditions. A minimum 0.01µF load
capacitor is required for stable operation. Start-up time for
the REF1112 will be affected, depending on the value of
load capacitance and the bias currents being used. A 1µF
power supply bypass capacitor is recommended to mini-
mize supply noise within the circuit.
The REF1112 shunt voltage reference provides a versatile
function for low power and space-conservative applications.
The REF1112 can be configured with an additional diode
and NPN transistor to provide a temperature compensated
current reference as shown in Figure 2. The REF112 can be
scaled to provide extremely low power reference voltages.
Figure 3 shows the REF1112 used as a 1V out, 3µA voltage
reference, and in Figure 4 a 2.5V reference on 1µA.
. VS
10kΩ
ISET
ISET =
VREF
RSET
0.1µF
RSET
FIGURE 2. REF1112 Provides a Stable Current Source.
3V
795kΩ
0.1µF
VREF
REF1112
250kΩ
1MΩ
3V
TLV2401
VOUT = 1V
FIGURE 3. MicroPOWER 3µA 1V Voltage Reference.
3V
RSET
VOUT = 2.5V
0.1µF
0.1µF
RLOAD
FIGURE 4. 2.5V Reference on 1µA.
REF1112
SBOS283
www.ti.com
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet REF1112.PDF ] | |
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