ETRX357 Telegesis Ltd, ETRX357 Datasheet - Page 24

• Manufacturer Part Number: ETRX357
• Description: MODULE ZIGBEE EM357 W/CHIP ANT
• Manufacturer: Telegesis Ltd

Specifications of ETRX357

• Frequency: 2.4GHz
• Data Rate - Maximum: 250kbps
• Modulation Or Protocol: 802.15.4 Zigbee
• Applications: ISM
• Power - Output: 3dBm
• Sensitivity: -100dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 27mA
• Current - Transmitting: 31mA
• Data Interface: PCB, Surface Mount
• Memory Size: 192kB Flash, 12kB RAM
• Antenna Connector: On-Board, Chip
• Operating Temperature: -40°C ~ 85°C
• Package / Case: Module
• Rohs Compliant: YES
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 920-1006-2

ETRX351 AND ETRX357
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 13 shows the reference carrier board
which was used during testing by Telegesis.
Figure 13. Reference Board
For best performance it is recommended to locate the antenna towards the corner of the carrier
board and to respect the recommended keep-out 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 40 x 40mm. 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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ETRX35x Preliminary Product Manual