KTX2 데이터 시트보기 (PDF) - Radiometrix Ltd
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KTX2 Datasheet PDF : 8 Pages
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Power supply requirement
The KTX2 module incorporates a built-in regulator which delivers a constant 2.8V supply to the RF
circuitry when the external supply voltage is 2.85V or greater, with 40dB or more of supply ripple
rejection. This ensures constant performance up to the maximum permitted supply rail and removes the
need for external supply decoupling except in cases where the supply rail is extremely poor (ripple/noise
content >0.1Vp-p).
Note, however, that for supply voltages lower than 2.85V the regulator is effectively inoperative and
supply ripple rejection is considerably reduced. Under these conditions the ripple/noise on the supply rail
should be below 10mVp-p to avoid problems. If the quality of the supply is in doubt, it is recommended
that a 10µF low-ESR tantalum or similar capacitor be added between the module supply pin (Vcc) and
ground, together with a 10Ω series feed resistor between the Vcc pin and the supply rail.
The module current in standby mode (Vcc applied, S0, S1, S2, S3 all at 0V) is less than 1µA.
The KTX2 incorporates a low voltage shutoff circuit, which prevents any possibility of erratic operation by
disabling the RF output if the supply voltage drops below 2.2V (±5%). This feature is self-resetting, i.e.
restoring the supply to greater than 2.2V will immediately restore RF output from the module.
Module mounting considerations
The module may be mounted vertically or bent horizontal to the motherboard. Good RF layout practice
should be observed – in particular, any ground return required by the antenna or feed should be connected
directly to the RF GND pin at the antenna end of the module, and not to the OV pin which is intended as
a DC ground only. All connecting tracks should be kept as short as possible to avoid any problems with
stray RF pickup.
If the connection between module and antenna does not form part of the antenna itself, it should be made
using 50Ω microstrip line or coax or a combination of both. It is desirable (but not essential) to fill all
unused PCB area around the module with ground plane.
Warning: DO NOT wash the module. It is not hermetically sealed.
optional solder joint
for extra mechanical
strength
recommended horizotal mounting method
vertical mounting method
Figure 4: Module mounting options
Radiometrix Ltd, KTX2 Data Sheet
page 5
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