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3. TECHNICAL BRIEF
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3.3 26 MHz Clock (VCTCXO, X500)
The 26 MHz clock(X500) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 26 MHz. It is used within the Si4205, analog base band chipset (U101,
AD6537B), digital base band chipset (U103, AD6527)
3.4 Power Supplies for RF Circuits (RF LDO, U503)
Two regulators are used for RF circuits. One is MIC5255 (U503), and the other is one port of AD6537B
(U101).
MIC5255 (U503) supplies power to transceiver (SI4210, U501). One port of AD6537B supplies power
to VCTCXO (X500). Main power (VBAT) from battery is used for PAM (AWT6171, U500) because
PAM requires high power.
(1608)
R515
100
C542
1000p
2V75_VVCXO
2.2u
C543
R514
15K
26MHz
X500
2
GND
3
OUT
VCC
4
VCONT
1
AFC
Figure 3-6 VCTCXO CIRCUIT DIAGRAM
Supplier
Voltage
Powers
enabled signal
U503(VRF)
2.85 V
U501
CLKON
U102(VVCXO)
2.75 V
X500
Battery(VBAT)
3.4 ~ 4.2 V
U500, U503
Table 3-2 RF POWER SUPPLIERS
Summary of Contents for S5000
Page 1: ...Date November 2005 Issue 1 0 Service Manual S5000 Service Manual Model S5000 ...
Page 3: ... 4 ...
Page 82: ...4 TROUBLE SHOOTING 83 4 12 KEY backlight Trouble Test Points Figure 4 21 ...
Page 101: ...5 DOWNLOAD AND CALIBRATION 102 9 Phone test Finish is shown in below screen ...
Page 103: ... 104 ...
Page 111: ... 112 8 PCB LAYOUT ...
Page 112: ... 113 8 PCB LAYOUT ...
Page 113: ... 114 ...
Page 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 125: ... 126 ...
Page 126: ... 127 ...
Page 128: ... 129 12 EXPLODED VIEW REPLACEMENT PART LIST ...
Page 129: ... 130 ...