User Manual

Table Of Contents
XT55/56 Hardware Interface Description
Confidential / Preliminary
s
XT55/56_hd_v02.96 Page 89 of 125 18.08.2005
supply voltage and operating temperature: To achieve T
amb max
= 70°C and, for example, GSM
900 PCL 5 the supply voltage must not be higher than 4.2V.
***)
To achive T
amb max
= 70°C at permanent GPRS class 8 operation (1 TX, 4 RX GSM 900 at
PCL 5 with a supply voltage 4.2V) it is recommended to integrate XT55/56 in such a way that a
minor heat exchange with the environment can take place. A solution might be the usage of a
small heat sink.