ETRX2 Telegesis Ltd, ETRX2 Datasheet - Page 23

• Manufacturer Part Number: ETRX2
• Description: MODULE ZIGBEE EM250 CHIP ANT
• Manufacturer: Telegesis Ltd

Specifications of ETRX2

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: ISM
• Power - Output: 3dBm
• Sensitivity: -98dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 35.5mA
• Current - Transmitting: 35.5mA
• Data Interface: PCB, Surface Mount
• Memory Size: 128kB Flash, 5kB SRAM
• Antenna Connector: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Module Applications: AMR, Building Automation, Wireless Sensor Network, M2M Industrial Controls
• Mcu Supported Families: EM250
• Processor Type: EM250
• Wireless Protocol: IEEE 802.15.4
• Data Rate: 250Kbps
• Module Interface: I2C, SPI, UART
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 920-1000-2

ETRX2
15.1 Example carrier board
Since the RF performance of the module with the on board antenna is strongly dependent on the
proper location of the module on its carrier board Figure 8 shows the reference carrier board,
which was used during testing by Telegesis.
Figure 8. Reference Board
For best performance it is recommended to locate the antenna towards the corner of the carrier
board and to respect the recommended keepout areas as described in section 12.
Finally to provide a good reference ground to the on board antenna, the carrier board should have
a ground plane spanning no less than 60 x 50mm. In many cases a smaller ground plane will
suffice, but a degradation in radio performance could be the result.
©2009 Telegesis (UK) Ltd
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ETRX2 Product Manual (Rev 1.09)