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MICRF219 데이터시트(PDF) 20 Page - Micrel Semiconductor

부품명 MICRF219
상세설명  300MHz to 450MHz ASK Receiver with RSSI, Auto-Poll, Bit-Check and Squelch
PDF  24 Pages
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제조업체  MICREL [Micrel Semiconductor]
홈페이지  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MICRF219 데이터시트(HTML) 20 Page - Micrel Semiconductor

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Micrel
MICRF219
January 2009
M9999-011509
(408) 944-0800
20
t
9BPF
nloa
ning
s as
g ne
ger
) lon
uld al
be done with exhaustive range tests. Make sure the
individual ground connection has a dedicated via
rather then sharing a few of ground points by a single
via. Sharing ground via will increase the ground path
ld be solid and with no
g ground plane on top
ents. It normally adds
which changes the
materials as they are
ically, FR4 or better
he RF path should be
avoid loops and
ground and VDD lines
wer circuits (such
own sources of noise should
be laid out as far as possible from the RF circuits.
Avoid unnecessary wide traces which would add more
distribution capacitance (between top trace to bottom
GND plane) and alter the RF parameters.
PCB Considerations and Layou
Figure 19 to 23 below show the QR21
PCB
layout. The Gerber files provided are dow
dable
from Micrel Website and contain the remai
layers
needed to fabricate this board. When copying or
making one’s own boards, make the trace
short
as possible. Long traces alter the matchin
twork
and the values suggested are no lon
valid.
Suggested matching values may vary due to PCB
variations. A PCB trace 100 mills (2.5mm
g has
about 1.1nH inductance. Optimization sho
ways
inductance. Ground plane shou
sudden interruptions. Avoid usin
layer next to the matching elem
additional stray capacitance
matching. Do not use Phenolic
conductive above 200MHz. Typ
materials are recommended. T
as straight as possible to
unnecessary turns. Separate
from other digital or switching po
microcontroller…etc). Kn
Figure 19. QR219BPF Top Layer
Figure 20. QR219BPF Bottom Layer



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