LG KG320 - General Phone Functions; Making a Phone Call

3. TECHNICAL BRIEF
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3.3 26 MHz Clock (VCTCXO, X400)
The 26 MHz clock(X501) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 26 MHz. It is used within the SI4210, analog base band chipset (U101,
AD6535ABCZ), digital base band chipset (U102, AD6527BABCZ).
3.4 FEM for Triband(FL400)
(1608)
X400
2
GND
3
OUT
VCC
4
VCONT
1
26MHz C443
2.2u
C442
NA 1000p
C441
2V75_VVCXO
15K
R415
100
R414
AFC
Figure 3-6 VCTCXO CIRCUIT DIAGRAM
Select Mode Vc(EGSM) Vc(DCS/PCS)
EGSM-Rx Low Low
EGSM-Tx High Low
DCS-Rx Low Low
PCS-Rx Low Low
DCS/PCS-Tx Low High
Table 3-1 FEM CONTROL LOGIC