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REF1112AIDBZRG4 Datasheet(PDF) 5 Page - Texas Instruments |
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REF1112AIDBZRG4 Datasheet(HTML) 5 Page - Texas Instruments |
5 / 13 page 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 Ω I SET = V REF R SET 0.1 µF 3V 3V V REF V OUT = 1V 795k Ω 250k Ω 1M Ω REF1112 TLV2401 0.1 µF 3V R LOAD V OUT = 2.5V 0.1 µF R SET |
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