IDT5T9890NLGI

Differential - Input:Output:	Yes/No
Base Part Number:	IDT5T9890
Supplier Device Package:	68-VFQFPN (10x10)
Package / Case:	68-VFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C
Voltage - Supply:	2.3 V ~ 2.7 V
Divider/Multiplier:	Yes/No
Frequency - Max:	250MHz
Series:	--
Ratio - Input:Output:	2:10
Number of Circuits:	1
Output:	eHSTL, HSTL, LVTTL
Input:	eHSTL, HSTL, LVPECL, LVTTL
PLL:	Yes with Bypass
Type:	PLL Clock Driver
Part Status:	Obsolete
Packaging:	Tray

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Clock Generators, PLLs, Frequency Synthesizers: IDT5T9890NLGI Application Field and Working Principle

The IDT5T9890NLGI is an integrated Frequency Synthesizer designed for high-performance embedded clocks. This device is designed to generate high-precision clock signals and enable the conversion, duplication and distribution of clock signals. It integrates a low jitter voltage controlled oscillator (VCO), a charge pump, pre-scaler and dividers all on a single chip. It combines the flexibility of a programmable PLL with an application specific standard (ASSP) device.

Application Fields

The IDT5T9890NLGI is ideal for applications such as: networking, enterprise, data centers, and aerospace. This device is also highly desirable for point-to-point clocking and clock redundancy as it can only generate clock signals, eliminating the need for an external buffer. This is an efficient solution due to its wide range of outputs, which can range from 1 to 18 outputs and from a range of frequencies from 33MHz to 500MHz.

Working Principle

The IDT5T9890NLGI produces low-jitter clock signals of high accuracy and precision. This is accomplished through the use of a PLL designed to produce clock signals with an improved phase noise performance, a multi-modulus pre-scaler, wideband dividers and a bandgap reference.The input clock is split into two paths. One path is routed to the VCO, where it is used to generate a desired frequency, and the other path is routed to the multi-modulus pre-scaler. The pre-scaler can select any of 24 steps, including fractional frequencies and alternate waveforms. The output of the pre-scaler is routed to a series of wideband dividers and compared with the output of the VCO. Any differences between the two signals are used to adjust the VCO frequency in order to maintain the desired frequency. The output of the VCO is then routed to the wideband dividers, where it is divided down to the output frequency.The device also includes a programmable charge pump that is used to adjust the VCO frequency. Adjustments can be made over the entire operating temperature range and provide the flexibility to adapt the output frequency to any changes in the environment.Finally, the device incorporates an integrated low-noise bandgap reference that provides a highly accurate and stable output with an extremely low frequency. This reference provides the stability necessary for the output frequency to be adjusted with very high accuracy.

Conclusion

The IDT5T9890NLGI is an excellent choice for applications that require high-precision clock signals. It integrates a VCO, charge pump, pre-scaler, dividers and a bandgap reference all on one chip, making it an efficient solution. This device is highly desirable for networking, enterprise, data centers and aerospace applications due to its wide range of outputs and the ability to generate clock signals without the need for an external buffer.

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