Using the Boards as a Design Reference
The basic evaluation boards included in this kit are very simple, yet they
illustrate some important techniques that you may wish to incorporate into
your own board layout. You will observe that the LT mounting pads extend
slightly past the edge of the part. This eases hand assembly and allows for
better heat conduction under the part if rework is necessary. Next, observe
the use of a full ground plane fill on the lower side of the board. This ground
plane serves three important purposes:
First, since a quarter-wave antenna is employed, the ground plane is
critical to serve as a counterpoise (you may wish to read Application Notes
AN-00500 and AN-00501 for additional details on how a ground plane
affects antenna function).
Second, a ground plane can help minimize the transfer of noise between
stages of a product, as well as unintentional radiation of noise into free
space.
Third, a ground plane allows for the implementation of a microstrip feed
to the antenna. The term microstrip refers to a PCB trace running over
a ground plane that is designed to serve as a 50-ohm transmission line
between the module and the antenna. A microstrip is implemented on
this evaluation board. If you are unfamiliar with microstrip calculations, you
may wish to refer to the LT Series Transceiver Module Data Guide or the
calculator available on our website, www.linxtechnologies.com.
– 7 –
相关PDF资料
EVAL-418-HHCP KIT EVAL FOR HHCP 418MHZ XMITTER
EVAL-433-HHLR KIT EVAL FOR HHLR 433MHZ XMITTER
EVAL-433-LC KIT BASIC EVAL 433MHZ LC SERIES
EVAL-916-ES KIT EVAL BASIC 916MHZ ES SERIES
EVAL-BT BOARD EVALUATION BLUETOOTH
EVB71101B-433-FSK-C EVALUATION BOARD TH71101 RECEIVR
EVB71102B-315-FSK-C EVALUATION BOARD TH71102 RECEIVR
EVB71111B-915-FSK-C EVALUATION BOARD TH71111 RECEIVR
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