LM2917N-8/NOPB

When looking for a Voltage to/from Frequency/Voltage converter, you may find the LM2917N-8/NOPB is one solution. This integrated circuit performs the V/F and F/V conversion and is useful when controlling the power supply design in a variety of applications.

Applications

The LM2917N-8/NOPB application fields are in high end systems, the primary applications being found in the medical, aviation, instrumentation and industrial installation markets, and also servers, smart card readers and routers.

The V/F and F/V conversion can help to simplify the design of industrial power supplies as well as reduce noise, power consumption, and cost. It also offers over-voltage and under-voltage protection, and can be combined with other protection devices to create more operational flexibility and greater design efficiency.

The LM2917N-8/NOPB is also perfect for applications where a digital signal is needed to control an electromechanical process, where the Frequency/Voltage converter can be used to adjust the frequency of the signal, with the Voltage/Frequency converter being used to adjust the voltage.

Design

The LM2917N-8/NOPB is based on a five-terminal voltage-controlled oscillator (VCO) and integrated power supply design. The VCO is used to achieve the conversion between frequencies and voltages. It is also equipped with a synchronous variable frequency output.

The design of the LM2917N-8/NOPB includes three main components: an oscillator, a power supply regulator, and a transducer. The oscillator consists of a tuned tank circuit and a transistor amplifier. The coils and capacitors of the tuned tank circuit help to set the frequency of the oscillator, while the transistor amplifier is used to amplify the fluctuating voltages from the tuned tank circuit.

The power supply regulator works to convert the input voltage to the required levels for the oscillator, transducer, and output transistor. The output of the power supply regulator is normally 3.3V, although higher voltage can be set using a resistor divider network.

The transducer is used to convert the electrical signal from the VCO into a frequency varying one. It is responsible for controlling the frequency variation of the output signals, thus providing the Voltage to Frequency or Frequency to Voltage conversion.

Finally, the output transistor is used to shape the output frequency-varying signal, based on the inputs from the oscillator, power supply regulator, and transducer. The transistor also provides an extra level of protection, absorbing any excess electric current that may occur in the system.

Conclusion

The LM2917-8/NOPB integrated circuit offers a convenient solution for V/F and F/V conversion tasks. It is equipped with several features that can help to reduce power consumption, noise levels, and the overall cost of designing the power supply. Furthermore, its combination of oscillator, power supply regulator and transducer allow for engineers to create a stable and reliable Voltage to/from Frequency/Voltage circuit.