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REF1112AIDBZRG4 Datasheet(PDF) 5 Page - Texas Instruments

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Part # REF1112AIDBZRG4
Description  10ppm1A, 1.25V SHUNT VOLTAGE REFERENCE
Download  13 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

REF1112AIDBZRG4 Datasheet(HTML) 5 Page - Texas Instruments

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REF1112
5
SBOS283C
www.ti.com
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 1
µA bias current is required to maintain a stable
output voltage and can be provided with a resistor con-
nected to the supply voltage. I
BIAS depends on the values
selected for R
BIAS 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 R
BIAS must be low
enough to maintain the minimum operating current at the
minimum and maximum load and supply voltage levels.
FIGURE 1. Typical Connections.
A 0.1
µF load capacitor is recommended to maintain stabil-
ity under varying load conditions. A minimum 0.01
µF 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 1
µF
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, 3
µA voltage
reference, and in Figure 4 as a 2.5V reference on 1
µA.
FIGURE 2. REF1112 Provides a Stable Current Source.
FIGURE 3. MicroPOWER 3
µA 1V Voltage Reference.
FIGURE 4. 2.5V Reference on 1
µA.
I
BIAS = IREF + ILOAD
V
S
V
REF
R
BIAS
I
LOAD
I
BIAS =
V
S VREF
R
BIAS
0.1
µF
I
REF
1
µF
V
S
I
SET
0.1
µF
R
SET
10k
I
SET =
V
REF
R
SET
0.1
µF
3V
3V
V
REF
V
OUT = 1V
795k
250k
1M
REF1112
TLV2401
0.1
µF
3V
R
LOAD
V
OUT = 2.5V
0.1
µF
R
SET


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