MAX3544 Просмотр технического описания (PDF) - Maxim Integrated

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MAX3544

Multiband Digital Television Tuner

Maxim Integrated 

Multiband Digital Television Tuner

Layout Recommendations

IMPORTANT: The MAX3544 includes on-chip track-

ing filters that utilize external inductors placed on the

PCB at pins 30 through 37. Because the tracking filters

operate at frequencies up to 862MHz, they are sensitive

to the inductor and PCB trace parasitics. To achieve

the optimal RF performance (gain, noise figure, and

image rejection), the MAX3544 is production tested and

trimmed with the exact inductors, their relative location

and orientation, and the trace parasitics present on the

MAX3544 Reference Design. To avoid performance

degradation, PCB designs should exactly copy the RF

section of the Reference Design layout and use the

inductors specified in the Reference Design bill of mate-

rials. Contact Maxim to obtain the Reference Design

layout to use as a starting point for PCB designs.

In addition to the aforementioned requirements, follow

general good RF layout practices. Keep RF signal lines

as short as possible to minimize losses and radiation.

Use controlled impedance on all high-frequency traces.

The exposed paddle must be soldered evenly to the

board’s ground plane for proper operation. Use abun-

dant vias beneath the exposed paddle and maximize

the area of continuous ground plane around the paddle

on the bottom layer for maximum heat dissipation. Use

abundant ground vias between RF traces to minimize

undesired coupling.

To minimize coupling between different sections of the

IC, the ideal power-supply layout is a star configuration,

which has a large decoupling capacitor at the central

VCC node. The VCC traces branch out from this node,

with each trace going to separate VCC pins of the

MAX3544. Each VCC pin must have a bypass capaci-

tor with a low impedance to ground at the frequency of

interest. Do not share ground vias among multiple con-

nections to the PCB ground plane.

Package Information

For the latest package outline information and land patterns,

go to www.maxim-ic.com/packages. Note that a “+”, “#”, or

“-” in the package code indicates RoHS status only. Package

drawings may show a different suffix character, but the drawing

pertains to the package regardless of RoHS status.

PACKAGE

TYPE

40 TQFN-EP

PACKAGE

CODE

T4066+2

OUTLINE

NO.

21-0141

LAND PATTERN

NO.

90-0053

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