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3. TECHNICAL BRIEF
3.3 13 MHz Clock
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 Si4205, analog base band
chipset (U101, AD6521), digital base band chipset (U102, AD6525), and MIDI (U200) chipset.
Figure 3-6. VCTCXO circuit diagram
3.4 Power Supplies for RF Circuits
Two regulators are used for RF circuits. One is MIC5255 (U402), and the other is one port of
ADP3522 (U301).
MIC5255 (U402) supplies power to transceiver (SI4205, U401).
One port of ADP3522 supplies power to VCTCXO (X400).
Main power (VBAT) from battery is used for PAM (RF3133, U400) because PAM requires high
power.
Table 3-2. Power suppliers for RF circuits.
Figure 3-7. U402 circuit diagram
(1608)
100
R415
2V75_VTCXO
C435
2.2u
R414
15K
C432
X400
OUT
CTL
VCC
GND
1
2
3
4
13MHz
1000p
AFC
Supplier
Voltage
Powers
Enabled signal
U402 2.85V
U401
RF_EN
U301
2.75V
X400
Battery 3.4~4.2V
U400
R418
NA
R419
0
0.01u
C437
10u
C438
IN
5
OUT
U402
MIC5255-2.85BM5
4
BYP
EN
3
GND
2
1
VBAT
VRF
10u
C436
RF_EN
CLKON
Summary of Contents for C3100
Page 1: ...Service Manual Model C3100 Service Manual C3100 P N MMBD0033001 Date June 2004 Issue 1 0 ...
Page 51: ...Graph 4 15 EGSM TX 50 VCX VC2 VCX VC2 4 TROUBLE SHOOTING Graph 4 14 DCS TX ...
Page 67: ...5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 66 5 DISASSEMBLY INSTRUCTION ...
Page 68: ... 67 5 DISASSEMBLY INSTRUCTION Figure 5 3 Figure 5 4 ...
Page 69: ... 68 Figure 5 5 5 DISASSEMBLY INSTRUCTION ...
Page 70: ... 69 5 DISASSEMBLY INSTRUCTION Figure 5 6 Figure 5 7 1 3 2 4 1 2 3 ...
Page 71: ... 70 Figure 5 8 Figure 5 9 5 DISASSEMBLY INSTRUCTION 4 2 3 1 2 1 ...
Page 72: ... 71 5 DISASSEMBLY INSTRUCTION Figure 5 10 ...
Page 83: ... 82 7 BLOCK DIAGRAM 7 BLOCK DIAGRAM Power supply ...
Page 90: ... 89 9 PCB LAYOUT 9 PCB LAYOUT ...
Page 91: ... 90 9 PCB LAYOUT ...
Page 98: ... 97 11 3 HW Test Software for Standalone Test Setup 11 STAND ALONE TEST ...
Page 100: ... 99 Tx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 102: ... 101 Rx Stand alone Test Setting 11 STAND ALONE TEST ...
Page 104: ... 103 12 3 Equipment Setup Figure 12 1 Equipment Setup 12 AUTO CALIBRATION ...
Page 107: ... 106 12 AUTO CALIBRATION ...
Page 109: ... 108 13 EXPLODED VIEW REPLACEMENT PART LIST ...