Frequency synthesizer TSA6060. Reference data

Encyclopedia of radio electronics and electrical engineering / Reference materials

 Comments on the article

Philips Semiconductors is a leading manufacturer of frequency synthesizers, radio transmitter chips, receivers and other components that are used directly or indirectly in radio communication systems. Philips Semiconductors frequency synthesizers are used to build radio channel modules for car alarms, systems for collecting and processing information from remote sites, security and access control systems, and radiotelephony systems.

The TSA6060 chip [1] by Philips Semiconductors is designed to build digital synthesizers with a phase-locked loop (PLL) operating in the AM and FM bands. It includes all the elements necessary to build a frequency synthesizer with a PLL, with the exception of a voltage controlled oscillator (VCO) and a low frequency filter (LPF). The microcircuit includes: a generator and a reference frequency divider, an input frequency divider with a programmable division factor (17 bits), a digital phase detector, a two-level current amplifier and a controller for communicating with the microcontroller using the I protocol²C. The block diagram of the device is shown in fig. 1. Table 1 gives the numbers, designations and assignments of the pins of the microcircuit, in table 2 - its main technical characteristics. The microcircuit is available in DIP16 and SO16 packages, its pinout is shown in fig. 2.

Information is written to the microcircuit (its programming) is carried out along two lines - SDA and SCL - bus I²C [2]. One address and four configuration bytes are used for programming. The address byte (AB byte) contains the device address and the AS bit (Table 3). If this bit coincides with the logic level on the corresponding output of the microcircuit, configuration information is written to it. To one I²Two synths that are independent of each other can be connected to the C-bus, and the AS bit allows you to select which synthesizer you want to program. The address byte is not programmed, information is entered into it during production by the manufacturer, the contents of the AS bit are determined by the potential at pin 12 of the microcircuit.

If only part of the information needs to be updated (eg DBO+DB1), the TSA6060 can be partially programmed. In any case, the transfer must be terminated by a "stop condition". On fig. 3 shows the sequence of information transfer from the microcontroller to the frequency synthesizer. The assignment of the bits of the configuration bytes is as follows (Table 4):

• R1, R2 set the frequency grid step (Table 5);
• X determines the operating mode of the circuit ("0" - AM band, "1" - FM band);
• Y controls output keys ("0" - FM/AM key is open, AM/FM key is closed, "1" - vice versa);
• Z sets the frequency of the used quartz resonator;
• BS controls the mode of the microcircuit output of the same name (this output is open-collector), with BS="0" the output is switched to a high-impedance state, with BS="1" - in the current absorption mode;
• Т1, Т2, ТЗ determine the circuit testing modes (Table 6).

When Z="0" the microcircuit should work with a quartz resonator at 4 MHz, at Z="1" - at 8 MHz. Input frequency division factor for AM band (X="0") is S2-2⁰ + S3-2¹ + S4-2² + ... + + S15-2¹³ + S16-2¹⁴, and for the FM band (X="1") SO-2⁰ + S1-2¹ + S2-2² + ... + + S15-2¹⁵ + S16-2¹⁶.

Moreover, for AM the minimum division factor is 2⁶=64, for FM - 2⁸= 256.

If the CP bit (Current Amplifier Control Bit) is set to "1", then the amplifier outputs a current of about 500 µA, which provides a fast tuning speed. Otherwise (when CP="0"), the current is 25 µA, thus providing a higher tuning accuracy.

The block diagram of the PLL synthesizer is shown in fig. 4, a typical switching circuit - in fig. 5. In the synthesizer, using a phase detector, the phases of the reference frequency are compared with the frequency at the output of the programmable divider, obtained as a result of dividing the VCO frequency. When the PLL is in "capture" mode, that is, when the phase difference at the input of the phase detector is less than the limit value, the output of the current amplifier is in a high-impedance state, and the output of the loop-capture detector (INLCK) is logic "1". When the loop is out of the "capture" mode, that is, when the phase difference between the input signals is noticed by the phase detector, the current amplifier generates correction pulses for the loop filter (LPF). For the FM band, the filter is made on C5-C10-R7 elements, for AM - on C6-C9-R6. The pulse duration is proportional to the phase difference. Depending on which of the signals arriving at the phase detector is ahead of the other, the output of the current amplifier switches either to the absorption mode or to the current source mode, thereby charging or discharging the capacitors in the loop filter to the voltage necessary to put the PLL loop into the capture mode. . Outside the phase-matching mode, the INLCK output is logic "0".
Rice. 6 illustrates the sequence of the frequency control process. On the upper graph, the oscillator frequency is plotted along the vertical axis: f1 - VCO frequency, f2 - stable frequency of the exemplary oscillator. After turning on the circuit, it is first programmed. Then the frequency of the VCO begins to increase. When the phase difference between f2 and fl is less than the limit value (intervals t1-t2, t3-t4 and t > 15), the internal flag goes to "0", indicating that the circuit is in capture mode. If the frequency f1 increases slightly, the adjustment process starts, the internal flag changes to "1", and f1 returns to the capture range (interval t2-t3). If f1 decreases, everything is the same (interval t4-t5). Logic "1" at the INLCK output, indicating that f1 is in capture mode, appears with a delay equal to 8 oscillation periods of f2. This explains the absence of a logical "1" at the INLCK output during the short capture periods t1-t2 and t3-t4.

Table 1

Table 2

Rice. 1. Block diagram of the device

Rice. 2. Pinout of the microcircuit

Table 3

Rice. 3. The sequence of information transfer from the microcontroller to the frequency synthesizer

Table 4

Table 5

Table 6

Rice. 4. Block diagram of a PLL synthesizer

Rice. 5. Typical switching circuit

Rice. 6. Sequence of frequency control process

Publication: cxem.net

See other articles Section Reference materials.

Read and write useful comments on this article.

<< Back

Latest news of science and technology, new electronics:

Traffic noise delays the growth of chicks 06.05.2024

The sounds that surround us in modern cities are becoming increasingly piercing. However, few people think about how this noise affects the animal world, especially such delicate creatures as chicks that have not yet hatched from their eggs. Recent research is shedding light on this issue, indicating serious consequences for their development and survival. Scientists have found that exposure of zebra diamondback chicks to traffic noise can cause serious disruption to their development. Experiments have shown that noise pollution can significantly delay their hatching, and those chicks that do emerge face a number of health-promoting problems. The researchers also found that the negative effects of noise pollution extend into the adult birds. Reduced chances of reproduction and decreased fertility indicate the long-term effects that traffic noise has on wildlife. The study results highlight the need ... >>

Wireless speaker Samsung Music Frame HW-LS60D 06.05.2024

In the world of modern audio technology, manufacturers strive not only for impeccable sound quality, but also for combining functionality with aesthetics. One of the latest innovative steps in this direction is the new Samsung Music Frame HW-LS60D wireless speaker system, presented at the 2024 World of Samsung event. The Samsung HW-LS60D is more than just a speaker system, it's the art of frame-style sound. The combination of a 6-speaker system with Dolby Atmos support and a stylish photo frame design makes this product the perfect addition to any interior. The new Samsung Music Frame features advanced technologies including Adaptive Audio that delivers clear dialogue at any volume level, and automatic room optimization for rich audio reproduction. With support for Spotify, Tidal Hi-Fi and Bluetooth 5.2 connections, as well as smart assistant integration, this speaker is ready to satisfy your ... >>

A New Way to Control and Manipulate Optical Signals 05.05.2024

The modern world of science and technology is developing rapidly, and every day new methods and technologies appear that open up new prospects for us in various fields. One such innovation is the development by German scientists of a new way to control optical signals, which could lead to significant progress in the field of photonics. Recent research has allowed German scientists to create a tunable waveplate inside a fused silica waveguide. This method, based on the use of a liquid crystal layer, allows one to effectively change the polarization of light passing through a waveguide. This technological breakthrough opens up new prospects for the development of compact and efficient photonic devices capable of processing large volumes of data. The electro-optical control of polarization provided by the new method could provide the basis for a new class of integrated photonic devices. This opens up great opportunities for ... >>

Random news from the Archive Bilingualism improves brain health and mental health 12.10.2023 Scientists from the Jülich Research Center in Germany shared new discoveries about the benefits of bilingualism for the brain. There are many compelling arguments that being bilingual can help you maintain mental health throughout your life. Modern research supports this hypothesis, indicating that bilingualism at an early age significantly improves brain function, which continues into old age. In a study of 224 monolingual and 175 bilingual volunteers, researchers used magnetic resonance imaging (MRI) to measure the volume of gray matter in the posterior inferior left frontal lobe and the inferior left parietal lobe. These brain regions are responsible for language comprehension and production, and their functional and anatomical connections are closely interconnected. "Over time, as the new language becomes more stable, the excess gray matter is converted into denser connections and better connections in the white matter. This may explain why bilingual people maintain mental health throughout their lives," the scientists noted. The next step for researchers will be to study the relationship between learning a third language and mental performance in old age. For many, this can be an effective and simple way to build additional cognitive reserve.

Other interesting news:

▪ External video cards Gigabyte Aorus RTX 3080/3090 Gaming Box

▪ high speed jet engine

▪ Among the bees, there are also right-handers and left-handers

▪ Effect of anions on the solubility of polymers

▪ Robot sorting flies

News feed of science and technology, new electronics

Interesting materials of the Free Technical Library:

▪ section of the site Winged words, phraseological units. Selection of articles

▪ article Execution cannot be pardoned. Popular expression

▪ article From whom were the Americans forced to buy weapons donated by them four times more expensive than their cost? Detailed answer

▪ article Household sledge. Personal transport

▪ article A simple indicator of an alternating electric field. Encyclopedia of radio electronics and electrical engineering

▪ article Scheme, pinout (pinout) of Alcatel BE-1/3/4/5 cable. 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