NRF905 NORDIC SEMICONDUCTOR, NRF905 Datasheet - Page 33

• Manufacturer Part Number: NRF905
• Description: IC, TRANSCEIVER, 430 928MHZ, SMD
• Manufacturer: NORDIC SEMICONDUCTOR

Specifications of NRF905

• Transmitting Current: 9mA
• Data Rate: 50Kbps
• Frequency Range: 430MHz To 928MHz
• Modulation Type: GFSK
• Sensitivity Dbm: -100dBm
• Rf Ic Case Style: QFN
• No. Of Pins: 32
• Supply Voltage Range: 1.9V To 3.6V
• Output Power: 10dBm
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

PRODUCT SPECIFICATION
nRF905 Single Chip 433/868/915 MHz Radio Transceiver
11.2 PCB Layout Example; Differential Connection to a Loop Antenna
Figure 14 shows a PCB layout example for the application schematic in Figure 13. A
double-sided FR-4 board of 1.6mm thickness is used. This PCB has a ground plane on
the bottom layer. Additionally, there are ground areas on the component side of the
board to ensure sufficient grounding of critical components. A large number of via
holes connect the top layer ground areas to the bottom layer ground plane. There is no
ground plane beneath the antenna.
No components in bottom layer
b) Bottom silk screen
a) Top silk screen
d) Bottom view
c) Top view
Figure 14 PCB layout example for nRF905, differential connection to a loop antenna.
A fully qualified RF-layout for the nRF905 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: 1.4
Page 33 of 42
June 2006