MK1574-01STR

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The MK1574-01STR is a frequency synthesizer module first released by Mitel in 2005. The frequency synthesizer is a type of clock-generator or phase-locked loop (PLL) that outputs a constant frequency signal across a wide range of frequencies, making it suitable for many applications. This article explores the details of the MK1574-01STR, its application field and working principle.

Description

The MK1574-01STR is an IC that integrates a voltage controlled crystal oscillator (VCXO), phase comparator, PLL circuit and VCO into a 14-pin surface mount package. It operates from an input frequency of 12.8MHz to 54.075MHz with a division range of 1/8 to 4/4. The output frequency range is 6.4MHz to 270MHz. The MK1574-01STR also provides temperature stability with a ±3ppm tolerance and a temperature range of -30°C to 85°C.

The MK1574-01STR includes several control pins such as VIN, MODE and CLKSEL. The VIN and Mode pins provide access to the internal reference oscillator, allowing it to be tuned. The CLKSEL pin controls the frequency division ratio or VCO gain. The module includes over- and under-voltage protection on these pins and several other safety features to ensure reliable operation.

Application Field

The MK1574-01STR is used in a variety of applications, from personal computers and networking equipment to medical devices and automotive systems. It is especially suitable for clock-generator and PLL applications, such as clock and data recovery, clock-multiplication, clock-synthesis, sample-rate converters and digital tuning for direct-broadcasting systems.

The MK1574-01STR enhances system performance due to its high integration and flexibility. It has a low-noise characteristic and low-power consumption, and provides high-precision frequency adjustments. The MK1574-01STR also includes a wide stability range and temperature compensation. All these features make the device suitable in various frequency-intensive applications.

Working Principle

The MK1574-01STR uses the phase-locked loop (PLL) principle to generate a stable output frequency. The PLL works by comparing the phase of the reference frequency and output frequency to determine the necessary frequency adjustment. If their phase difference is greater than a certain threshold, the chip generates an error signal which is used to adjust the output frequency to keep it in sync with the reference frequency.

The MK1574-01STR contains a voltage-controlled crystal oscillator (VCXO) to provide a stable reference frequency, which is usually supplied by an external clock source. The output frequency is then adjusted by the VCO and phase comparator circuit inside the module. The phase comparator monitors the phase difference between the input and output signals and determines the frequency shift necessary to adjust the phase difference to zero.

The frequency division ratio of the output signal is controlled by the CLKSEL pin. This pin is used to adjust the VCO gain, which changes the division ratio of the output signal. The division ratio can range from 1/8 to 4/4, allowing the output frequency to be adjusted over a wide range. The MODE and VIN pins are also used to control the reference frequency, allowing it to be tuned to achieve an even more precise frequency.

Conclusion

The MK1574-01STR is a versatile and reliable frequency synthesizer module suitable for many clock-generator and PLL applications. It integrates a VCXO, phase comparator, and PLL circuit in a single surface mount package. The MODE and VIN pins give access to the internal reference oscillator, allowing it to be tuned for even more precise frequency control. The output frequency is adjustable over a wide range using the CLKSEL pin, making it suitable for many frequency-intensive applications.

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