3. TECHNICAL BRIEF
- 22 -
3.3 13 MHz Clock (VCTCXO, X301)
The 13 MHz clock(X301) 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 (U102,
AD6537B), digital base band chipset (U101, AD6525), and MIDI (U401) chipset.
3.4 Power Supplies for RF Circuits (RF LDO, U303)
Two regulators are used for RF circuits. One is MIC5255 (U303), and the other is one port of AD6537B
(U102).
MIC5255 (U303) supplies power to transceiver (SI4205, U301). One port of AD6537B supplies power
to VCTCXO (X301). Main power (VBAT) from battery is used for PAM (SKY77325, U302) because
PAM requires high power.
AD6535_AFCDAC
(1608)
VVCXO
15K
R312
13MHz
X301
1
CTL
2
GND
3
OUT
VCC
4
2.2u
C337
1000p
C335
AFC
Figure 3-6 VCTCXO CIRCUIT DIAGRAM
VRF
VBAT
4
BYP
EN
3
GND
2
1
IN
5
OUT
U303
MIC5255-2.85BM5
4.7u
C345
C344
10u
0.01u
C343
CLKON
Figure 3-7 RF LDO CIRCUIT DIAGRAM
Supplier
Voltage
Powers
enabled signal
U303(VRF)
2.85 V
U301, U302
CLKON
U102(VVCXO)
2.75 V
X301
Battery(VBAT)
3.4 ~ 4.2 V
U302, U303
Table 3-2 RF POWER SUPPLIERS
Summary of Contents for C1150
Page 1: ...Service Manual Model C1150 Service Manual C1150 Date October 2005 Issue 1 0 ...
Page 3: ......
Page 99: ...Note 100 ...
Page 104: ... 105 8 PCB LAYOUT 8 PCB LAYOUT ...
Page 105: ... 106 8 PCB LAYOUT ...
Page 113: ...10 STAND ALONE TEST 114 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 117: ...Note 118 ...
Page 119: ... 120 Note ...
Page 135: ...Note 136 ...