13 Mhz Clock; Switchplexer For Triband - LG KG800 Service Manual

3. TECHNICAL BRIEF
3.2 13 MHz Clock (VCTCXO, X400)
The 13 MHz clock(X400) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 13 MHz. It is used within the SKY74400, analog base band chipset (U100,
AD6535), digital base band chipset (U101, AD6527B).
R403
AFC
3.3 Switchplexer for Triband(FL400)
EGSM-Tx
EGSM-Rx
DCS/PCS-Tx
DCS-Rx
PCS-Rx
X400
1
VCONT
10K
2
GND
C407
13MHz
1000p
Figure 3-3 VCTCXO CIRCUIT DIAGRAM
Vc1
0.0-0.1V
0.0-0.1V
0.0-0.1V
0.0-0.1V
2.3-3.0V
Table 3-1 FEM CONTROL LOGIC
2V75_VVCXO
C405
1000p
100
3
OUT
R404
4
VCC
C408
1u
Vc2
0.0-0.1V 2.3-3.0V
0.0-0.1V 0.0-0.1V
2.3-3.0V 0.0-0.1V
0.0-0.1V 0.0-0.1V
0.0-0.1V 0.0-0.1V
- 22 -
13MHz
Vc3 Current
10mA Max
≈ 0mA
10mA Max
≈ 0mA
10mA Max