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300MHz-to-450MHz Low-Power,
Crystal-Based ASK Transmitter
Layout Considerations
A properly designed PC board is an essential part of
any RF/microwave circuit. On the PA output, use con-
trolled-impedance lines and keep them as short as
Functional Diagram
possible to minimize losses and radiation. At high fre-
quencies, trace lengths that are on the order of λ /10 or
longer can act as antennas.
Keeping the traces short also reduces parasitic induc-
tance. Generally, 1in of PC board trace adds about
DATA
ENABLE
MAX1472
AND
GATE
PA
V DD
PAOUT
20nH of parasitic inductance. The parasitic inductance
can have a dramatic effect on the effective inductance.
For example, a 0.5in trace connecting a 100nH induc-
PAGND
tor adds an extra 10nH of inductance, or 10%.
To reduce the parasitic inductance, use wider traces
and a solid ground or power plane below the signal
traces. Using a solid ground plane can reduce the par-
asitic inductance from approximately 20nH/in to 7nH/in.
Also, use low-inductance connections to ground on all
GND pins, and place decoupling capacitors close to all
V DD connections.
XTAL1
XTAL2
LOCK DETECT
32 x PLL
CRYSTAL-
OSCILLATOR
DRIVER
GND
PROCESS: CMOS
Chip Information
Package Information
For the latest package outline information and land patterns
(footprints), 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
8 SOT23
PACKAGE
CODE
K8SN+1
OUTLINE NO.
21-0078
LAND
PATTERN NO.
90-0176
8
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相关代理商/技术参数
MAX1473ETJ 制造商:Maxim Integrated Products 功能描述:315MHZ/433MHZ ASK SUPERHETERODYNE RECEIVER WI - Rail/Tube
MAX1473ETJ+ 功能描述:射频接收器 315MHz/434MHz Superheterodyne Rcvr RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel
MAX1473ETJ+T 功能描述:射频接收器 315MHz/434MHz Superheterodyne Rcvr RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel
MAX1473ETJ-T 制造商:Maxim Integrated Products 功能描述:315MHZ/433MHZ ASK SUPERHETERODYNE RECEIVER WI - Tape and Reel
MAX1473EUI 功能描述:射频接收器 RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel
MAX1473EUI/V+ 功能描述:射频接收器 315MHz/434MHz Superheterodyne Rcvr RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel
MAX1473EUI/V+T 功能描述:射频接收器 315MHz/434MHz Superheterodyne Rcvr RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel
MAX1473EUI+ 功能描述:射频接收器 315MHz/434MHz Superheterodyne Rcvr RoHS:否 制造商:Skyworks Solutions, Inc. 类型:GPS Receiver 封装 / 箱体:QFN-24 工作频率:4.092 MHz 工作电源电压:3.3 V 封装:Reel