Overview
The LM34DZ/NOPB, produced by Texas Instruments, is a precision integrated-circuit temperature sensor. This device is calibrated directly in degrees Fahrenheit, eliminating the need to subtract a large constant voltage from its output to obtain Fahrenheit scaling. The LM34 series devices are known for their high accuracy, with typical accuracies of ±1/2°F at room temperature and ±1-1⁄2°F over a full −50°F to 300°F temperature range. They do not require any external calibration or trimming, thanks to wafer-level trimming and calibration. The low output impedance, linear output, and precise inherent calibration make interfacing to readout or control circuitry straightforward. The device operates from a supply voltage range of 5 to 30 volts and draws less than 90 µA, resulting in very low self-heating of less than 0.2°F in still air.
Key Specifications
| Parameter | Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| Operating Temperature Range | TMIN ≤ TA ≤ TMAX | °F | −50 | 300 | |
| Supply Voltage Range | V | 4 | 30 | ||
| Accuracy at 77°F | °F | −1 | ±0.4 | 1 | |
| Accuracy from −50°F to 300°F | °F | −2.5 | ±1-1⁄2 | 2.5 | |
| Temperature Slope | mV/°F | 10 | |||
| Current Drain | VS = 5 V | µA | 75 | 90 | |
| Self-Heating | In still air | °F | <0.2 | ||
| Output Impedance | For 1-mA load | Ω | 0.4 |
Key Features
- Calibrated directly in degrees Fahrenheit, eliminating the need for additional voltage adjustments.
- Linear 10.0 mV/°F scale factor.
- Operates from 5 to 30 volts.
- Accuracy assured: ±1/2°F at room temperature and ±1-1⁄2°F over the full −50°F to 300°F range.
- Low self-heating: less than 0.2°F in still air.
- Suitable for remote applications.
- Nonlinearity: only ±0.5°F typical.
- Low-impedance output: 0.4 Ω for a 1-mA load.
- Low current drain: less than 90 µA.
Applications
- Power supplies: The LM34 is suitable for temperature monitoring in power supply units.
- Battery management: It can be used to monitor battery temperatures in various battery management systems.
- HVAC (Heating, Ventilation, and Air Conditioning): Ideal for temperature sensing in HVAC systems.
- Appliances: Used in various household and industrial appliances for temperature monitoring.
- Remote applications: Its low power consumption and high accuracy make it suitable for remote temperature sensing applications.
Q & A
- What is the operating temperature range of the LM34DZ/NOPB? The operating temperature range is from −50°F to 300°F.
- What is the supply voltage range for the LM34DZ/NOPB? The supply voltage range is from 5 to 30 volts.
- What is the accuracy of the LM34DZ/NOPB at room temperature? The accuracy at room temperature is typically ±1/2°F.
- How much current does the LM34DZ/NOPB draw from its supply? The device draws less than 90 µA from its supply.
- What is the self-heating of the LM34DZ/NOPB in still air? The self-heating is less than 0.2°F in still air.
- What is the output impedance of the LM34DZ/NOPB for a 1-mA load? The output impedance is 0.4 Ω for a 1-mA load.
- Is the LM34DZ/NOPB suitable for remote applications? Yes, it is suitable for remote applications due to its low power consumption and high accuracy.
- What is the nonlinearity of the LM34DZ/NOPB? The nonlinearity is only ±0.5°F typical.
- Can the LM34DZ/NOPB be used with single or dual power supplies? Yes, it can be used with either single or dual power supplies.
- What are some common applications of the LM34DZ/NOPB? Common applications include power supplies, battery management, HVAC systems, and various household and industrial appliances.
