LMK6C datasheet(29/56 Pages) TI

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10 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification,

and TI does not warrant its accuracy or completeness. TI’s customers are responsible for

determining suitability of components for their purposes, as well as validating and testing their design

implementation to confirm system functionality.

10.1 Application Information

The LMK6x is high-performance, fixed-frequency oscillator that can be used as a reference clock. The product

family supports any output frequency between 1 MHz to 400 MHz for differential LMK6D, LMK6H, LMK6P or 1

MHz to 200 MHz for singled-ended LVCMOS clock output types, and 1.8-V or 2.5-V through 3.3-V supply rails.

10.2 Typical Application

For reference schematic implementation for LMK6x family of oscillators, refer to the LMK6EVM User's Guide for

bypass capacitor and AC-coupling capacitor value recommendations. Refer to the Clock Output Interfacing and

Termination section for output clock required termination and biasing.

Figure 10-1 shows a typical application example. The LMK6D differential oscillator is used as an input to the

LVDS buffer input in this example.

LMK6D Differential Oscillator - 156.25 MHz

100

ASIC / FPGA / PHY

VDD

Power

Conditioning

Output/Chip

Control Logic

1 μF

Output

driver

GND

CLK_ P

CLK_ N

Figure 10-1. Application Example

10.2.1 Design Requirements

The LMK6x is a fixed-frequency oscillator with no programming needed. Make sure to follow the recommended

termination options as described in the Clock Output Interfacing and Termination section closely. Refer to the

Function Pin(s) section to understand the pin 1 and pin 2 functions, and order the part number as per your

requirements for Output Enable (OE), Standby (ST) options.

10.2.2 Detailed Design Procedure

The LMK6x has three different options for differential output which are LVDS, LVPECL, HCSL type and one

LVCMOS single-ended output type. For designing with the any of the oscillator output type in actual system, use

the proper AC or DC termination based on the application requirement. Refer to the Clock Output Interfacing

and Termination section for the details of all the AC and DC termination schemes and use the appropriate

option. The figures in this section have all the AC and DC coupling options with the termination resistor

values. The LMK6x has an integrated LDO and has excellent PSRR performance as shown in the Electrical

Characteristics table. Refer to the LMK6EVM for the reference layout recommendation while designing the

LMK6x BAW oscillator.

For the Function Pin 1 of LMK6C, connect typical 10-kΩ or less resistor to VDD for driving the OE pin High. Note

this pin can be left open if you do not want to use pullup resistor as the device has > 100-kΩ internal pullup

resistor. For driving the OE pin to Low, use the typical 10 kΩ or less resistor as a pulldown resistor. For the

Function Pin 1 or Functional Pin 2 for LMK6D, LMK6H, LMK6P, you can use the similar approach described for

LMK6C.

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LMK6C, LMK6D, LMK6H, LMK6P

SNAS826D – APRIL 2022 – REVISED FEBRUARY 2023

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