NRF9E5 Datasheet, PDF (93/104 Pages) List of Unclassifed Manufacturers – 433/868/915MHz RF Transceiver with Embedded 8051 Compatible Microcontroller and 4 Input, 10 Bit ADC

PRODUCT SPECIFICATION
nRF9 E5 Single Chip Transceiver with Embedded Microcontroller and ADC
20 PCB LAYOUT AND DECOUPLING GUIDELINES
nRF9E5 is an extremely robust RF device due to internal voltage regulators and requires
the minimum of RF layout protocols. However the following design rules should still be
incorporated into the layout design.
A PCB with a minimum of two layers including a ground plane is recommended for
optimum performance. The nRF9E5 DC supply voltage should be decoupled as close as
possible to the VDD pins with high performance RF capacitors. It is preferable to mount
a large surface mount capacitor (e.g. 4.7µF tantalum) in parallel with the smaller value
capacitors. The nRF9E5 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
nRF9E5 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 place via holes as close as possible to the VSS pins. A minimum of 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.
A fully qualified RF-layout for the nRF9E5 and its surrounding components, including
antennas and matching networks, can be downloaded from www.nordicsemi.no.
Main office: Nordic Semiconductor ASA - Vestre Rosten 81, N-7075 Tiller, Norway -Phone [phone] - Fax [phone]
Revision: 1.1
Page 93 of 104
June 2004