MICRF112 datasheet(28/46 Pages) MICROCHIP

Part #	MICRF112

Description	The MICRF112 is a high-performance, easy-to-use, true “Data-In, RF-Out”, ASK/FSK, Phase-Locked Loop (PLL)- based, transmitter IC for applications in the 300 MHz to 450 MHz frequency range.

PDF	46 Pages

Scroll/Zoom	100%

Manufacturer	MICROCHIP [Microchip Technology]

Direct Link	http://www.microchip.com

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28 / 46 page

MICRF112

Application Information

Data Sheet

DS70005554A - 28

Output Matching Network

Part of the function of the output network is to attenuate the second and third harmonics. When

matching to a transmit frequency, be sure not only to optimize for maximum output power but to

attenuate unwanted harmonics.

Layout Issues

PCB layout is extremely important to achieve optimum performance and consistent manufacturing

results. Be careful with the orientation of the components to ensure that they do not couple or

decouple the RF signal. PCB trace length must be short, to minimize parasitic inductance (1in ~

20nH). For example, depending on inductance values, a 0.5 in trace can change the inductance

by as much as 10%. To reduce parasitic inductance, the use of wide traces and a ground plane

under signal traces is recommended. Use vias with low-value inductance for components requiring a

connection to ground.

Antenna Layout

The antenna trace layout affects directivity. No ground plane must be under the antenna trace. For

consistent performance, do not place components inside the loop of the antenna.

MICRF112 Datasheet(PDF) 28 Page - Microchip Technology