3. TECHNICAL BRIEF
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3.3 13 MHz Clock (VCTCXO, X500)
The 13 MHz clock(X500) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 13 MHz. It is used within the Si4205, analog base band chipset
(U101, AD6537B), digital base band chipset (U100, AD6527).
3.4 Power Supplies for RF Circuits (RF LDO, U702)
Two regulators are used for RF circuits. One is MIC5255 (U702), and the other is one port of
AD6537B (U101).
MIC5255 (U702) supplies power to transceiver (SI4205, U500). One port of AD6537B supplies
power to VCTCXO (X500).
Figure 3-6 VCTCXO CIRCUIT DIAGRAM
APC
X500
2V75_VVCXO
13MHz
C536
22u
VCC
ONG
OUT VCONT
100
R514
1
2
3
4
C538
1000p
15K
R516
Table 3-2 RF POWER SUPPLIERS
Voltage
Powers
enabled signal
U702(VRF)
U101(VVCXO)
Battery(VBAT)
Supplier
2.85 V
2.75 V
3.4 ~ 4.2 V
U500
U501, U702
X500
Содержание B2070
Страница 54: ... 53 4 TROUBLE SHOOTING 4 2 TX Trouble TEST POINT 13Mhz OSCILLATOR Mobile SW FEM TRANCEIVER LDO PAM ...
Страница 68: ... 67 4 TROUBLE SHOOTING TEST POINT 4 6 LCD Trouble ...
Страница 72: ... 71 4 TROUBLE SHOOTING TEST POINT 4 8 Speaker Trouble ...
Страница 79: ... 78 4 TROUBLE SHOOTING 4 11 KEY backlight Trouble TEST POINT ...
Страница 96: ...6 Press Start and Pover on the phone using JIG remote Power on Switch 1 5 DOWNLOAD AND CALIBRATION 95 ...
Страница 107: ... 106 8 PCB LAYOUT Figure 8 1 B2070 BOTTOM SIDE PCB LAYOUT ...
Страница 108: ... 107 8 PCB LAYOUT Figure 8 1 B2070 TOP SIDE PCB LAYOUT ...
Страница 109: ... 108 ...
Страница 117: ...10 STAND ALONE TEST 116 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
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