ꢁWt6280
ꢁPPLICꢁtION INFOꢃMꢁtION
18
17
DCS/PCS RF INPUT
1
16
15
14
13
12
11
10
DCS/PCS_IN
DCS/PCS_OUT
2
3
4
5
6
7
BAND SELECT
BS
GND
GND
1nF++
1nF++
TX_EN
VBATT
CEXT
TX ENABLE
ꢁsM
or
BATTERY
VOLTAGE
N/C
47uF++ 2.7pF**
22nF**
ꢁWt6280
GND
FꢀM
DAC OUTPUT
VRAMP
GSM_IN
GND
68pF*
2.2k*
GSM_OUT
GSM850/900 RF INPUT
8
9
*
Component values depends on baseband chipset used.
** This component should be placed as close to the device pin as possible.
++ These components are recommended as good design practice for improving noise
rejection characteristics. The values specified are not critical as they may not be required in the
final application.
Figure 4: ꢃecommended ꢁpplicaꢄion Circuiꢄ
13
Data Sheet - Rev 2.1
11/2008