LG M6100 Service Manual - Page 21

MHz Clock VCTCXO, X501, 3 FEM for TribandFL501

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3. TECHNICAL BRIEF 3.2 13 MHz Clock (VCTCXO, X501) The 13 MHz clock(X501) 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 (U101, AD6535), digital base band chipset (U103, AD6527B). AFC R507 10K C533 1000p X501 GND VCC 2 4 1 VCONT OUT 3 13MHz 2V75_VVCXO C532 2.2u (1608) Figure 3-3 VCTCXO CIRCUIT DIAGRAM 3.3 FEM for Triband(FL501) EGSM-Tx EGSM-Rx DCS/PCS-Tx DCS-Rx PCS-Rx Vc1 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V 2.3-3.0V Vc2 0.0-0.1V 0.0-0.1V 2.3-3.0V 0.0-0.1V 0.0-0.1V Vc3 2.3-3.0V 0.0-0.1V 0.0-0.1V 0.0-0.1V 0.0-0.1V Table 3-1 FEM CONTROL LOGIC Current 10mA Max ≈ 0mA 10mA Max ≈ 0mA 10mA Max - 22 -

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3. TECHNICAL BRIEF
- 22 -
3.2 13 MHz Clock (VCTCXO, X501)
The 13 MHz clock(X501) 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 (U101,
AD6535), digital base band chipset (U103, AD6527B).
3.3 FEM for Triband(FL501)
(1608)
10K
R507
2V75_VVCXO
C533
1000p
C532
2.2u
13MHz
X501
2
GND
3
OUT
4
VCC
1
VCONT
AFC
Figure 3-3 VCTCXO CIRCUIT DIAGRAM
Vc1
Vc2
Vc3
Current
EGSM-Tx
0.0-0.1V
0.0-0.1V
2.3-3.0V
10mA Max
EGSM-Rx
0.0-0.1V
0.0-0.1V
0.0-0.1V
≈ 0mA
DCS/PCS-Tx
0.0-0.1V
2.3-3.0V
0.0-0.1V
10mA Max
DCS-Rx
0.0-0.1V
0.0-0.1V
0.0-0.1V
≈ 0mA
PCS-Rx
2.3-3.0V
0.0-0.1V
0.0-0.1V
10mA Max
Table 3-1 FEM CONTROL LOGIC