Overview
The REF1112AIDBZRG4 is a precision two-terminal shunt voltage reference device manufactured by Texas Instruments. It is designed for high accuracy and outstanding temperature characteristics, making it suitable for power and space-sensitive applications. The device operates with a low quiescent current of 1μA and is housed in a compact SOT23-3 package. This makes it an ideal replacement for larger voltage reference components, such as the REF1004 and LT1004, in various designs. The REF1112AIDBZRG4 is specified to operate from –40°C to +85°C, with extended operation up to +125°C.
Key Specifications
| Parameter | Min | |||
|---|---|---|---|---|
| Reverse Breakdown Voltage (VR) | 1.2475 | 1.25 | 1.2525 | V |
| Output Voltage Tolerance | ±0.2% | |||
| Temperature Coefficient (0°C to +70°C) | 10 | 30 | ppm/°C | |
| Temperature Coefficient (–40°C to +85°C) | 15 | 50 | ppm/°C | |
| Operating Current Range (IREF) | 1.2μA | 5mA | ||
| Low-Frequency Noise (0.1Hz to 10Hz) | 25μVpp | |||
| Reverse Dynamic Impedance (ZR) | 0.135Ω | 0.2Ω | ||
| Operating Temperature Range (TA) | –40°C | +125°C |
Key Features
- Compact Package: The REF1112AIDBZRG4 is available in a small SOT23-3 package, making it ideal for space-sensitive designs.
- Precision Voltage Reference: Offers a fixed reverse breakdown voltage of 1.25V with an output voltage tolerance of ±0.2%.
- Low Operating Current: Operates with a quiescent current as low as 1.2μA, making it suitable for battery-powered and low-power applications.
- Low Temperature Coefficient: Features a low temperature coefficient of 30ppm/°C from 0°C to +70°C and 50ppm/°C from –40°C to +85°C.
- Low Noise: Exhibits low low-frequency noise of 25μVpp from 0.1Hz to 10Hz.
- Stability and Regulation: Requires minimal external components for stable operation, including a resistor for setting the input current and a capacitor for output stability.
Applications
- Battery-Powered Instruments: Suitable for devices that require low power consumption and high accuracy.
- Building Security Sensors: Ideal for security systems that need reliable and precise voltage references.
- Medical Equipment: Used in medical devices where precision and low power are critical.
- Field Transmitters: Applicable in field transmitter systems that require stable voltage references over a wide temperature range.
- Calibrators: Utilized in calibration equipment where high accuracy and stability are essential.
- Level Shifting and ADC Input Range: Can be used to achieve full input range of analog-to-digital converters (ADCs) and for level shifting applications.
- Stable Current Source: Can be configured to provide a temperature-compensated current reference.
Q & A
- What is the typical operating current of the REF1112AIDBZRG4?
The typical operating current is 1.2μA.
- What is the reverse breakdown voltage of the REF1112AIDBZRG4?
The reverse breakdown voltage is 1.25V with a tolerance of ±0.2%.
- What is the temperature coefficient of the REF1112AIDBZRG4 from 0°C to +70°C?
The temperature coefficient is 30ppm/°C.
- What is the operating temperature range of the REF1112AIDBZRG4?
The device operates from –40°C to +125°C.
- What package type is the REF1112AIDBZRG4 available in?
The device is available in a SOT23-3 package.
- What are the typical applications of the REF1112AIDBZRG4?
It is used in battery-powered instruments, building security sensors, medical equipment, field transmitters, and calibrators.
- How does the REF1112AIDBZRG4 maintain stability under varying loads?
It requires an external capacitor (minimum 0.01μF) to maintain stability under varying load conditions.
- Can the REF1112AIDBZRG4 be used to provide adjustable voltage references?
Yes, it can be combined with other components like the OPA347 to provide adjustable voltage references.
- What is the recommended decoupling capacitor for the input voltage line?
A 0.1μF ceramic capacitor or larger is recommended to reduce noise on the input voltage line.
- How can the REF1112AIDBZRG4 be used as a stable current source?
It can be configured with an additional diode and NPN transistor to provide a temperature-compensated current reference.
