Overview
The LM331N/NOPB is a precision voltage-to-frequency converter produced by Texas Instruments. It is part of the LMx31 family, which is renowned for its high accuracy and versatility in various applications. This component is ideal for use in simple, low-cost circuits and is particularly suited for analog-to-digital conversion, precision frequency modulation, and demodulation. The LM331N/NOPB operates on a single 5-V supply and can handle a wide range of full-scale frequencies from 1 Hz to 100 kHz, making it a valuable asset in many electronic systems.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Ambient Temperature | 0 | - | 70 | °C |
| Supply Voltage, VS | 4 | - | 40 | V |
| Full-Scale Frequency Range | 1 Hz | - | 100 kHz | - |
| VFC Non-Linearity (Full Scale) | ±0.003% | ±0.01% | ±0.02% | - |
| Temperature Stability of Gain | ±30 ppm/°C | - | ±150 ppm/°C | - |
| Supply Current at 5 V | 1.5 mA | 3 mA | 6 mA | - |
| Output Current | 116 μA | 136 μA | 156 μA | - |
| Input Comparator Offset Voltage | ±3 mV | - | ±10 mV | - |
Key Features
- Ensured Linearity: 0.01% maximum non-linearity over the full scale frequency range.
- Single or Split Supply Operation: Can operate on a single 5-V supply or with split supplies.
- Excellent Temperature Stability: ±50 ppm/°C maximum temperature stability of gain.
- Low Power Consumption: Typical power consumption of 15 mW at 5 V.
- Wide Dynamic Range: Minimum of 100 dB at 10-kHz full-scale frequency.
- Pulse Output Compatible With All Logic Forms: The output is compatible with all logic forms and can drive up to 3 TTL loads or a high-voltage output up to 40 V.
- Short-Circuit Proof: The output is short-circuit proof against VCC.
Applications
- Voltage to Frequency Conversions: Ideal for converting analog voltage signals into proportional frequency signals.
- Frequency to Voltage Conversions: Can be used in reverse to convert frequency signals back into voltage signals.
- Remote-Sensor Monitoring: Suitable for monitoring remote sensors due to its high accuracy and stability.
- Tachometers: Used in tachometer applications where precise frequency measurement is required.
- Analog-to-Digital Conversion: Provides low-cost analog-to-digital conversion in microprocessor-controlled systems.
Q & A
- What is the operating temperature range of the LM331N/NOPB?
The operating ambient temperature range is from 0°C to 70°C. - What is the supply voltage range for the LM331N/NOPB?
The supply voltage range is from 4 V to 40 V. - What is the full-scale frequency range of the LM331N/NOPB?
The full-scale frequency range is from 1 Hz to 100 kHz. - How accurate is the LM331N/NOPB in terms of non-linearity?
The non-linearity is ±0.01% maximum over the full scale frequency range. - What is the typical power consumption of the LM331N/NOPB at 5 V?
The typical power consumption is 15 mW at 5 V. - Is the LM331N/NOPB short-circuit proof?
Yes, the output is short-circuit proof against VCC. - What are some common applications of the LM331N/NOPB?
Common applications include voltage to frequency conversions, frequency to voltage conversions, remote-sensor monitoring, tachometers, and analog-to-digital conversion. - Can the LM331N/NOPB operate with split supplies?
Yes, it can operate with either single or split supplies. - How stable is the LM331N/NOPB over temperature changes?
The temperature stability of gain is ±50 ppm/°C maximum. - What is the dynamic range of the LM331N/NOPB?
The minimum dynamic range is 100 dB at 10-kHz full-scale frequency.
