IC K174UR7. Encyclopedia of radio electronics and electrical engineering

 Comments on the article

IC K174UR7 is a specialized IC for radio receivers, containing an intermediate frequency limiting amplifier of the FM path A1, a balanced FM detector U1 and a low-frequency preamplifier A2. A typical switching circuit is shown in Fig.3.

Ris.1

Functional diagram of IC K174UR7

Fig.2. Purpose of the K174UR7 IC pins

Fig.3. Typical switching circuit for IC K174UR7

The input signal is fed to the input of the limiting amplifier A1, from the output of which the limited signal is fed to the input of the frequency detector U1. The output of the frequency detector is connected to the non-inverting input of the operational amplifier A2, which pre-amplifies the audio frequency. The dependences of the main electrical parameters of the IC on the operating modes are shown in fig. 4-10.

Electrical parameters of IC K174UR7 at 25±10°C and Ui.p.nom=6 V

• Current consumption I mA, no more than ..... 0,6
• Limiting input voltage Uin.limit, μV, at fin=0,25 MHz, fmod=1 kHz, not more than ..... 70
• Low-frequency output voltage UoutLF, mV, at Uin=10 mV, fin=0.25 MHz, fmod=1 kHz, not less than ..... 90
• Amplitude modulation suppression coefficient KpAM, dB, at Uin=10 mV, fin=0,25 MHz fmod=1 kHz, not less than ..... 30

Limiting operational parameters of IC K174UR7

• Supply voltage Ui.p, V: minimum ..... 5,4 maximum ..... 6,6
• Input signal voltage Uin, mV, not more than ..... 100
• Output current / , mA, not more than ..... 0,1

Ris.4

The dependence of the input voltage limit on the supply voltage of the microcircuit at an input signal frequency of 250 kHz. FM modulation frequency 1 kHz, frequency deviation ±3.5 kHz. ambient temperature 25°C for IC K174UR7

Ris.5

Dependence of the LF output voltage on the input voltage at a supply voltage of 6 V; input signal frequency 250 kHz; modulation frequency of FM mode 1 kHz: ambient temperature 25°C for IC K174UR7: 1 - frequency deviation ±3,5 kHz: 2 - frequency deviation ±7,5 kHz

Ris.6

Dependence of the LF output voltage on the supply voltage at an input voltage of 10 mV, an input signal frequency of 250 kHz, an FM mode modulation frequency of 1 kHz, a frequency deviation of ±3.5 kHz, and an ambient temperature of 25°С for the K174UR7 IC

Ris.7

Dependence of the LF output voltage on the load resistance at a supply voltage of 6 V, an input voltage of 10 mV, an input signal frequency of 250 kHz, an FM mode modulation frequency of 1 kHz, a frequency deviation of ±3,5 kHz, and an ambient temperature of 25 ° C for the K174UR7 IC

Ris.8

The dependence of the low-frequency output voltage on the ambient temperature at a supply voltage of 6 V, an input voltage of 10 mV, an input signal frequency of 250 kHz, a modulation frequency of 1 kHz. frequency deviation ±3,5 kHz for IC K174UR7

Ris.9

Dependence of the current consumption on the supply voltage at a temperature of 25°C for IC K174UR7

Ris.10

The dependence of the current consumption on the ambient temperature at a supply voltage of 6 V for K174UR7.

Publication: N. Bolshakov, rf.atnn.ru

See other articles Section Application of microcircuits.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Machine for thinning flowers in gardens 02.05.2024

In modern agriculture, technological progress is developing aimed at increasing the efficiency of plant care processes. The innovative Florix flower thinning machine was presented in Italy, designed to optimize the harvesting stage. This tool is equipped with mobile arms, allowing it to be easily adapted to the needs of the garden. The operator can adjust the speed of the thin wires by controlling them from the tractor cab using a joystick. This approach significantly increases the efficiency of the flower thinning process, providing the possibility of individual adjustment to the specific conditions of the garden, as well as the variety and type of fruit grown in it. After testing the Florix machine for two years on various types of fruit, the results were very encouraging. Farmers such as Filiberto Montanari, who has used a Florix machine for several years, have reported a significant reduction in the time and labor required to thin flowers. ... >>

Advanced Infrared Microscope 02.05.2024

Microscopes play an important role in scientific research, allowing scientists to delve into structures and processes invisible to the eye. However, various microscopy methods have their limitations, and among them was the limitation of resolution when using the infrared range. But the latest achievements of Japanese researchers from the University of Tokyo open up new prospects for studying the microworld. Scientists from the University of Tokyo have unveiled a new microscope that will revolutionize the capabilities of infrared microscopy. This advanced instrument allows you to see the internal structures of living bacteria with amazing clarity on the nanometer scale. Typically, mid-infrared microscopes are limited by low resolution, but the latest development from Japanese researchers overcomes these limitations. According to scientists, the developed microscope allows creating images with a resolution of up to 120 nanometers, which is 30 times higher than the resolution of traditional microscopes. ... >>

Air trap for insects 01.05.2024

Agriculture is one of the key sectors of the economy, and pest control is an integral part of this process. A team of scientists from the Indian Council of Agricultural Research-Central Potato Research Institute (ICAR-CPRI), Shimla, has come up with an innovative solution to this problem - a wind-powered insect air trap. This device addresses the shortcomings of traditional pest control methods by providing real-time insect population data. The trap is powered entirely by wind energy, making it an environmentally friendly solution that requires no power. Its unique design allows monitoring of both harmful and beneficial insects, providing a complete overview of the population in any agricultural area. “By assessing target pests at the right time, we can take necessary measures to control both pests and diseases,” says Kapil ... >>

Random news from the Archive Insects found to eat Styrofoam 25.06.2022 The intestinal microflora of zofobus can decompose inert polystyrene foam. Insects can only eat this material, it will not affect their growth and development in any way. Scientists from Australia have found that zophobus larvae can foam. By itself, this material decomposes very slowly, and therefore pollutes the environment. Polyfoam is widely used in construction as a heater. However, its waste is highly toxic. As one of the authors of the study, Christian Rinke, said, during the experiment, scientists studied the condition of the zophobus larvae for three weeks. One group was fed on bran, and the second group was fed on Styrofoam. There was also a third group that was not fed at all. It turned out that the insects that consumed the foam behaved and looked absolutely normal. Some of them even gained weight. This suggests that the larvae can absorb organic matter from the foam.

Other interesting news:

▪ The new role of DNA

▪ memory prosthesis

▪ The moon may have been responsible for the sinking of the Titanic

▪ Some novelties of Consumer Electronics Show 2004

▪ Smart guide vest for the visually impaired

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Microcontrollers. Article selection

▪ article Apparatus for aces (aerobatics steadicam). video art

▪ article Which club won the main trophy after removing the word mighty from the name? Detailed answer

▪ article Carrying out demonstration experiments in biology. Standard instruction on labor protection

▪ article Proportional control equipment. Encyclopedia of radio electronics and electrical engineering

▪ article Charger on the PIC12F675 microcontroller. Encyclopedia of radio electronics and electrical engineering

Leave your comment on this article:

All languages ​​of this page

Arabic	Hebrew	Polish
Bengali	Hindi	Portuguese
Chinese	Italian	Spanish
English	Japanese	Turkish
French	Korean	Ukrainian
German	Malay	Vietnamese

Home page | Library | Articles | Website map | Site Reviews

www.diagram.com.ua
2000-2024