VFJA1491P-125.000M-25.000M Integrated Circuits (ICs)

Due to market price fluctuations, if you need to purchase or consult the price. You can contact us or emial to us:   sales@allicdata.com

Clock/Timing - Clock Generators, PLLs, Frequency Synthesizers are crucial in many digital systems, controlling the timing of operations, synchronization and data communication. A variety of circuits for such functions are available and VFJA1491P-125.000M-25.000M is one of them.

VFJA1491P-125.000M-25.000M is a monolithic PLL integrated circuit aimed for automotive applications. It is implemented with CMOS technology, designed to be used as a frequency synthesizer, clock generator or timestamp counter. It receives an external clock with frequency of 125 MHz, and outputs multiple clocks with "integer" frequencies smaller than 25 MHz. It supports up to 32 output clocks, of various frequencies and with various duty-cycles.

The main characteristics of the VFJA1491P-125.000M-25.000M are the accuracy of the output clocks, low power consumption and robustness, isolated from environmental noise and temperature variations. It is packaged in an industry-standard 24 lead SOIC that is 0.208" Wide body with "exposed paddle", and its operating temperature range is -40 °C to +125 °C.

The VFJA1491P-125.000M-25.000M has many applications in automotive systems, such as infotainment, lighting, camera systems and engine control. It can be used for advanced vehicle stabilizing systems such as ABS and ESC, and for the development of digital HD cameras for the more modern car models.

A block diagram of the VFJA1491P-125.000M-25.000M is presented in Figure 1. The module comprises a PLL synthesizer, a Internal FIFO and a programmable decimator. The PLL consists of the reference frequency oscillator and input clock divider, a Programmable Loop Filter, and a Voltage Controlled Oscillator (VCO). The Internal FIFO is a storage register for the output frequency which is programmable as well.

The input clock is supplied by an external oscillator of 125 MHz. This signal is divided by a programmable pre-scaler, and the resulting signal is used as the reference for the Phase Lock Loop (PLL). The PLL\'s feedback signal is the output of the VCO, which is the actual clock signal to be generated. This signal is used to drive the programmable loop filter, whose purpose is to maintain the stability of the VCO. The Programmable Reload FIFO is a memory register which stores the data for generating the output clocks. The programmable decimator further divides the VCO\'s output signal and ultimately produces the desired output clocks.

Basically, the chip reads the data stored in the FIFO, and adjusts the output frequency accordingly. The output clocks are generated with programmable frequency, duty cycle and phases. This device is capable of producing up to 32 different output clocks.

The operation process is in Figure 2. It starts with the input clock. It is then divided down to a frequency 3.125 MHz. This signal is used for reference for the PLL, and designed to maintain the stability of the VCO. The output from VCO is the actual clock signal to be generated. This clock is then divided further by the programmable decimator, and eventually produces the desired output clocks.

The VFJA1491P-125.000M-25.000M is a versatile and powerful clock generator, with fast frequency switching, low power consumption and low phase noise. It is typically suitable for use in automotive applications where extreme environmental conditions are likely to be encountered.

In conclusion, the VFJA1491P-125.000M-25.000M is a monolithic clock generator integrated circuits increasing the accuracy, robustness and stability of digital systems, while reducing power consumption. It is an ideal clock generator, synthesizer or timestamp counter in the automotive industry, as it can provide up to 32 different output clocks with programmable frequency, duty cycle and phase.

The specific data is subject to PDF, and the above content is for reference