MAX3639ETM+T

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MAX3639ETM+T is a single-chip solution designed to reduce the number of components required in clock and timing applications, by combining the precision of a crystal-based synthesizer with the ease of use of MCUs. The device offers a PLL-based integrated solution with excellent jitter and periodic jitter performance and is ideal for high-performance timing applications, such as mobile/wireless/Wi-Fi applications, digital video applications, encryption/security applications and embedded system clock/timing applications.

The MAX3639ETM+T has an integrated clock synthesis module, which enables the device to generate all the timing elements needed for a common base band wireless system. The device includes an integrated high-performance PLL-based VCO, which can generate any frequency (within a range of 40MHz to 200MHz) that is required within the system. The internal PLL can also be used to generate all the other standard needed within the system, such as a reference clock and a timing clock, to ensure a synchronization.

The working principle of MAX3639ETM+T is to generate a common reference clock from an external crystal oscillator and then divide that down into several output clocks of different frequencies. The frequency of the output clocks is then adjusted, as required, to generate the required output timing frequencies. For example, an external 40MHz, 50MHz, and 80MHz crystal oscillator can be used to provide a 4MHz reference clock, which can then be divided down to generate other clock frequencies of 1MHz and 4KHz, as required.

The device can also be used to generate clock frequencies for other types of applications, such as radio frequency (RF) signals and audio frequency (AF) signals, by using the internal PLL. For example, if an 8MHz crystal oscillator is used, the device can generate a 4MHz reference clock, which can then be divided down by the internal PLL to generate a suitable RF or AF output frequency, as required.

The MAX3639ETM+T process can also be used to generate programmable timing signals, such as start up clocks and shutdown clocks, as well as to provide differential outputs. The PLL can also be used to generate multiple clock frequencies with different phase delays, which enables the device to be used in clock/timing applications that require precise synchronization. This is ideal for applications that require that all of the clock signals are supplied in phase, or with minimal phase differences.

The MAX3639ETM+T also provides an additional advantage, in that it is capable of generating clock signals with very low jitter and periodic jitter. The chip has an integrated jitter attenuator built into the PLL, which works by reducing the high-frequency components of the clock signal, which can cause jitter. By minimizing the jitter, the clock signals are more accurate and synchronous, which is essential for high-performance timing applications.

In conclusion, the MAX3639ETM+T is an ideal device for clock/timing applications, particularly those that require high-performance timing and precise synchronization. The integrated PLL-based VCO and jitter attenuator make it the perfect choice for applications that require accurate clocks and low jitter. As such, the device is widely used in mobile/wireless/Wi-Fi applications, digital video applications, encryption/security applications and embedded system clock/timing applications.

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