MAX9485ETP+

Series:	--
Packaging:	Tube
Part Status:	Obsolete
Type:	Clock Generator
PLL:	Yes
Input:	LVCMOS, LVTTL, Crystal
Output:	LVCMOS, LVTTL
Number of Circuits:	1
Ratio - Input:Output:	1:3
Differential - Input:Output:	No/No
Frequency - Max:	73.728MHz
Divider/Multiplier:	Yes/No
Voltage - Supply:	3 V ~ 3.6 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	20-WFQFN Exposed Pad
Supplier Device Package:	20-TQFN (4x4)
Base Part Number:	MAX9485

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MAX9485ETP+ Application Field and Working Principle

The MAX9485ETP+ is a low-noise clock generator for clock and data recovery (CDR) applications. This device is designed to serve as an all-in-one clock generator and CDR replacement for a wide range of networking and communication applications. This device is capable of generating both differential and single-ended clocks with output frequencies up to 6.4 GHz, with -20 dBFS of phase noise performance. The MAX9485ETP+ operates from a 4.5 V to 5.25 V supply and provides output control and monitor.

Classification

The MAX9485ETP+ belongs to the Clock/Timing category of Clock Generators, PLLs, Frequency Synthesizers. Generally speaking, clock generators, PLLs, and frequency synthesizers are devices that generate, control, and modify clocks. They are used to generate and control the timing signals required in digital systems, frequency modulation, and amplitude control applications.

Application Field

The MAX9485ETP+ is primarily used in networking and communication applications, such as 10GbE, SATA III, and Serial ATA (SATA) links. The MAX9485ETP+ is used to generate differential and/or single-ended clocks for clock and data recovery applications. Additionally, this device can generate PECL, LVDS, and LVPECL for clock synthesis, clock distribution, and signal switching applications. The MAX9485ETP+ is also suitable for radio frequency (RF) applications up to 6.4 GHz.

Working Principle

The MAX9485ETP+ is based on a PLL architecture composed of a VCO, phase-frequency detector (PFD), loop filter with an on-board witness transistor, and a voltage-controlled oscillator (VCO).The VCO generates a high-frequency (up to 6.4GHz) signal at a frequency determined by the control signals. The VCO signal is to be fed back to the PFD through a loop filter. The PFD can be used to compare and synchronize the input clock frequency and VCO output frequency to keep their ratio constant.The VCO gain is determined by the values on the loop filter capacitors, which are controlled by the witness resistor and the loop bias voltage. This way the output frequency can be modified by controlling the values of the loop filter capacitors and the loop bias voltage.

Conclusion

The MAX9485ETP+ is an all-in-one clock generator and CDR replacement for a wide range of networking and communication applications. This device is capable of generating differential and single-ended clocks with output frequencies up to 6.4 GHz, has -20 dBFS phase noise performance, and is suitable for radio frequency applications. Additionally, the MAX9485ETP+ can be used to generate PECL, LVDS, and LVPECL for clock synthesis, clock distribution, and signal switching applications. The MAX9485ETP+ has a PLL architecture composed of a VCO, PFD, loop filter with an on-board witness transistor, and a voltage-controlled oscillator. The output frequency of this device can be modified by controlling the values of the loop filter capacitors and the loop bias voltage.

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