LM331AN/NOPB Integrated Circuits (ICs)

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The LM331AN/NOPB is a low-power, precision voltage-to-frequency and frequency-to-voltage converter designed and manufactured by Texas Instruments. It belongs to the category of PMIC – V/F and F/V Converters. The device is ideal for use in applications such as sensor networks, industrial process controls, circuit metering, as well as voltage controlled oscillators and motor speed controllers. The LM331AN/NOPB offers excellent linearity for both the voltage-to-frequency and frequency-to-voltage operations and is available in an 8-pin TSSOP package.

The LM331AN/NOPB is based on a voltage-to-frequency technique and its input voltage range is from +2.6V to +6V. The operating frequency range is from 10kHz to 1MHz and when operated with a stable +5V supply voltage, the output is accurate to ±1%. It has a high stability temperature coefficient of only ±120ppm/°C, which helps to ensure the device will remain precise and accurate, even in changing temperatures. The output frequency is linearly proportional to the input voltage, typically having a slope of 10kHz/V with a temperature coefficient of 4 ppm/°C.

The LM331AN/NOPB has three pins for voltage input and one option pin for frequency output. The Enable pin is the enable/disable input. When pulled low the converter is disabled, allowing the output to remain low. The Frequency Out pin is for the signal output and the Voltage In pin is for the signal input. It is important to note that the output frequency of the device is inversely proportional to the voltage divider ratio of the supply voltage. The output frequency is proportional to the supply voltage over the operating voltage range of +2.6V to +6V.

The LM331AN/NOPB offers a unique Filtered Mode that eliminates noise spikes that can occur during the frequency-to-voltage conversion. The Filtered Mode is enabled by applying a logic low (0V) to the Enable pin. This feature helps ensure the output signal maintains its linearity and accuracy in noisy environments. The supply current of the device is very low, typically only 6µA, which helps extend battery life in battery-powered applications.

The LM331AN/NOPB is designed to operate over a wide temperature range, from -30°C to +85°C. The device is qualified to the AEC-Q100 Grade 0 standard, which makes it suitable for automotive applications. The device features short-circuit protection, thermal shutdown, and a fault signal, which may be used to signal a fault condition if an over-current or over-temperature situation occurs. The device is also radiation tolerant, making it suitable for space applications.

In summary, the LM331AN/NOPB is a low-power voltage-to-frequency and frequency-to-voltage converter from Texas Instruments. It is perfect for battery-powered applications due to its low supply current and excellent linearity. The device also features a unique Filtered Mode, which eliminates noise spikes and helps maintain linearity in noisy environments. The LM331AN/NOPB is qualified to the AEC-Q100 Grade 0 standard and is suitable for use in automotive and space applications.

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