SI5350B-B06409-GT

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The SI5350B-B06409-GT is a clock generator, phase-locked loop (PLL), and frequency synthesizer from Silicon Labs’ ClockTree family of products.

ClockTree products are used for providing highly integrated, zero delay buffer (ZDB) and low jitter, adaptive zero-delay buffer (AZDB) solutions for applications including wireless infrastructure, switching, connectivity, and telecom. These devices are typically used in timing-critical applications such as base station infrastructure or Point-of-Presence (PoP).

The SI5350B-B06409-GT is a 7-output device, offering phase noise of -152 dBc/Hz up to 100 kHz offset. It features a 4th-order bang-bang PLL with a VCO range of 3000 – 6000 MHz, 200 MHz reference clock input (sine or square, accurate to 75 ppm), 10/100/1000 Mb/s Ethernet interface, and 1PPS synchronization. The device is suitable for applications requiring a highly integrated solution for 1x - 3.125x frequency multiplication and has a frequency accuracy of ±7.5 ppm within 1 PPS accuracy.

In terms of working principle, the SI5350B-B06409-GT is essentially a 4th-order bang-bang phase-locked loop (PLL) with a voltage-controlled oscillator (VCO). The PLL works by using the reference signal to modulate the VCO frequency in order to match the reference frequency. The VCO frequency is adjusted in order to maintain an average voltage level of zero volts after being compared with the reference frequency. The VCO frequency is adjustable over a wide range, allowing the device to generate multiple output clocks with a variety of frequencies.

The device outputs multiple clocks, each of which can be programmed independently. The root of all of the output clocks is the integrated VCO, with the precise output frequencies controlled by a series of programmable dividers. There are seven output channels available, each of which can be used to drive load capacitances of up to 82 pF.

Overall, the SI5350B-B06409-GT is a highly integrated, zero delay buffer (ZDB) and low jitter, adaptive zero-delay buffer (AZDB) device that is suitable for a range of clock-dependent applications ranging from wireless infrastructure, switching and connectivity, to telecom. It works using a 4th-order bang-bang PLL with an integrated VCO, to generate frequency outputs which are precise and accurate to within ±7.5 ppm accuracy.

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