TXM-433-RM Linx Technologies Inc, TXM-433-RM Datasheet - Page 6

• Manufacturer Part Number: TXM-433-RM
• Description: TRANSMITTER RF 433MHZ
• Manufacturer: Linx Technologies Inc
• Series: RMr

Specifications of TXM-433-RM

• Frequency: 433MHz
• Applications: ISM, Remote Monitoring, Telemetry
• Modulation Or Protocol: ASK, OOK
• Data Rate - Maximum: 10 kbps
• Power - Output: -4dBm ~ 4dBm
• Current - Transmitting: 6mA
• Data Interface: PCB, Through Hole
• Antenna Connector: Through Hole
• Voltage - Supply: 5.9 V ~ 9 V
• Operating Temperature: -10°C ~ 55°C
• Package / Case: SIP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Features: -
• Memory Size: -
• Other names: TXM-433-RM-R

BOARD LAYOUT CONSIDERAT I O N S
Page 6
1 ) A
2) The RM transmitter should, as mu c h
3) The module may be mounted ve rtically or bent hori zontal to the product’s
4 ) No conductive items should be placed within .25 in. of the module’s
5 ) The trace from the transmitter to the antenna should be kept as short as
If you are at all familiar with RF devices you may be concerned about
s p e c i a l i zed layout requirements. Fo rt u n a t e l y, because of the care taken in
design, integrating an RM transmitter into your design is ve ry stra i g h t fo r wa r d .
By adhering carefully to a few basic design and layout ru l e s, you can enjoy a
t r o u ble-free path to RF success.
Figure 6 shows the suggested PCB
fo o t p rint for the RM tra n s m i t t e r.
p o s s i ble) should be placed directly
under the RM tra n s m i t t e r. T h i s
ground-plane can also be critical to
the perfo rmance of your antenna.
as reasonably possibl e, be isolated from all other components on your PCB.
S p e c i f i c a l l y, high-frequency circuitry such as crystal oscillators should be
kept as far away as possible from the tra n s m i t t e r.
P C B. If the transmitter is to be mounted parallel to the board, it should be
bent over so that the side without components is closest to the PC board
and the component side is facing away from the PC board.
component side to prevent detuning.
p o s s i bl e. A simple trace is suitable for runs up to 1/4 inch for antennas with
wide bandwidth chara c t e ri s t i c s. For longer runs or to avoid detuning a high-
Q narrow bandwidth antenna such as a helical, use a 50-ohm coax or 50-
ohm microstrip transmission line as shown in figure 7.
Depending on the type
antenna being used,
RM module may be
significantly higher than
F C C regulations allow.
The output power of the
module is intentionally
set high since many
designers
module
inefficient antenna in
order to realize cost or
space sav i n g s. S i n c e
a t t e nuation is commonly
required a designer may want to place locating pads in-line with the antenna
t race as show n . In the event that a T-pad is required the antenna trace can
be cut and the pads populated. For further details on T-pads please refer to
Linx application note #00150.
the output power of the
ground-plane
with
pair
(as
the
an
large
fi g u re 7: M i c ro s t rip transmission line
as
fi g u re 6: Recommended PCB fo o t p ri n t