LMK03000CISQ/NOPB

Series:	--
Packaging:	Tape & Reel (TR)
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Type:	Clock Conditioner
PLL:	No
Input:	LVCMOS, LVDS, LVPECL
Output:	LVDS, LVPECL
Number of Circuits:	1
Ratio - Input:Output:	1:8
Differential - Input:Output:	Yes/Yes
Frequency - Max:	1.296GHz
Divider/Multiplier:	Yes/No
Voltage - Supply:	3.15 V ~ 3.45 V
Operating Temperature:	-40°C ~ 85°C
Mounting Type:	Surface Mount
Package / Case:	48-WFQFN Exposed Pad
Supplier Device Package:	48-WQFN (7x7)
Base Part Number:	LMK03000

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LMK03000CISQ/NOPB Application Field and Working Principle

The LMK03000CISQ/NOPB is a low jitter and low noise clock generator and programmable spread spectrum synthesizer integrated circuit (IC). It is designed using Analog Devices’ proprietary high voltage, high speed complementary metal-oxide-semiconductor (CMOS) technology. The application field of the LMK03000CISQ/NOPB include generating and distributing clock signals, generating spread spectrum clocks, and providing very-low-jitter, spread-spectrum clock signals for in-system programming.

Description

The LMK03000CISQ/NOPB integrates both a programmable frequency synthesizer and a PLL that allows the user to generate output clock frequencies with very low jitter. The PLL includes a phase detector with a 1.2-V level shifter inputs, a programmable loop filter, and a voltage-controlled oscillator (VCO). It can be programmed to generate output clocks from 10 kHz to 600 MHz with zero-delay and low jitter. The programmable frequency synthesizer, on the other hand, provides either a fixed frequency output or a spread-spectrum clock signal output.

Working Principle

The LMK03000CISQ/NOPB works by using the input clock frequency as the reference frequency to synthesize other related lower and higher frequencies through the programmable frequency synthesizer and the PLL. The input clock frequency is divided by the PLL Divide Ratio register, and then compared to the output of the VCO in the phase detector. The output of the phase detector is connected to the loop filter, and its output will be the control voltage for the VCO. The programmable loop filter is used to set the loop gain, bandwidth, damping factor, and to control the jitter. The programmable frequency synthesizer uses a digital logic circuitry to generate the output frequency. It is programmed through a register which contains the desired output frequency. It can be programmed to output a fixed frequency, or a frequency which varies in a defined manner. The spread spectrum clock output of the LMK03000CISQ/NOPB is generated by modulating the reference clock frequency by a programmable delta frequency and spread width.

Benefits and Features

The LMK03000CISQ/NOPB offers several benefits and features that make it a popular choice for applications that require relatively low jitter and low noise clock generation. It offers a wide operating frequency range of 10 kHz to 600 MHz and provides very low jitter performance (7ps RMS) for both single-ended and differential inputs. The integrated programmable frequency synthesizer with spread spectrum modulator enables users to program precise frequency destinations with just one chip. The LMK03000CISQ/NOPB also has small size, low power consumption, and requires no external components, making it easy to integrate into any system. It has an on-board EEPROM that allows users to store up to 8 pre-programmed frequencies, as well as programmable spread spectrum modulation settings. It also supports external modulation input and provides 14 output options, including a 0.5V LVDS output.

Conclusion

The LMK03000CISQ/NOPB is a clock generator and programmable spread spectrum synthesizer integrated circuit. It provides a wide operating frequency range, low jitter performance, and superior noise immunity making it an ideal choice for applications that require low jitter and low noise clock signals. Its integrated programmable frequency synthesizer with spread spectrum modulator makes it easy to program precise frequency destinations with just one chip, and it offers several other benefits, such as small size, low power consumption, and no external components.

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