NRF2401 Datasheet, PDF (32/37 Pages) List of Unclassifed Manufacturers – Single chip 2.4 GHz Transceiver

PRODUCT SPECIFICATION
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A well-designed PCB is necessary to achieve good RF performance. Keep in mind
that a poor layout may lead to loss of performance, or even functionality, if due care is
not taken. A fully qualified RF-layout for the nRF2401 and its surrounding
components, including matching networks, can be downloaded from ZZZQYOVLQR.
A PCB with a minimum of two layers including a ground plane is recommended for
optimum performance. The nRF2401 DC supply voltage should be decoupled as close
as possible to the VDD pins with high performance RF capacitors, see Table 22. It is
preferable to mount a large surface mount capacitor (e.g. 4.7µF tantalum) in parallel
with the smaller value capacitors. The nRF2401 supply voltage should be filtered and
routed separately from the supply voltages of any digital circuitry.
Long power supply lines on the PCB should be avoided. All device grounds, VDD
connections and VDD bypass capacitors must be connected as close as possible to the
nRF2401 IC. For a PCB with a topside RF ground plane, the VSS pins should be
connected directly to the ground plane. For a PCB with a bottom ground plane, the
best technique is to have via holes as close as possible to the VSS pads. One via hole
should be used for each VSS pin.
Full swing digital data or control signals should not be routed close to the crystal or
the power supply lines.
Nordic VLSI ASA - Vestre Rosten 81, N-7075 Tiller, Norway - Phone [phone] - Fax [phone]
Revision: 1.0
Page 32 of 37
March 2003