LMK04832PAPSLASHEM datasheet(92/102 Pages) TI

92 / 102 page

0.01 F

Unpowered

Device

± 400 mV square

wave source

CLKIN or OSCIN

Figure 9-9. AC-Coupled ± 400 mV Signal Inputted to Unpowered Device

9.4 Layout

9.4.1 Layout Guidelines

In general, the following general guidelines are useful to keep in mind.

• GND pins on the outer perimeter of the package may be routed on the package back to the DAP

• Ensure the DAP on device is well-grounded with many vias.

• Use a low loss dielectric material, such as Rogers 4350B, for optimal output power.

• For power supply bypassing, isolate each clock group .

In addition to this, there are special considerations for the routing of the outputs. The outputs are divided in to

several output groups.

• Clock Group 0: CLKOUT0, CLKOUT1, CLKOUT12, CLKOUT13

• Clock Group 1: CLKOUT2, CLKOUT3

• Clock Group 2: CLKOUT4, CLKOUT5, CLKOUT6, CLKOUT7

• Clock Group 3: CLKOUT8, CLKOUT9, CLKOUT10, CLKOUT11

It is optimal to isolate the power supply pins for these clock group pins with a ferrite bead to crosstalk between

the outputs, especially if the output groups have different frequencies. If there is flexibility in planning which

frequencies go to which outputs, crosstalk can be minimized by putting different frequencies in different output

groups (as opposed to putting them in the same output group).

LMK04832-SEP

SNAS838A – OCTOBER 2022 – REVISED NOVEMBER 2022

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LMK04832PAP/EM Datasheet(PDF) 92 Page - Texas Instruments