3. TECHNICAL BRIEF
- 17 -
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 (U100,
AD6525), and MIDI (U200) chipset.
Figure 3-6 VCTCXO circuit diagram
(1608)
0
0
1
5
1
4
R
2V75_VTCXO
C435
2.2u
R414
15K
C432
X400
OUT
CTL
VCC
GND
1
2
3
4
13MHz
1000p
AFC
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.
Supplier
Voltage
Powers
Enabled signal
U402
2.85V
U401
RF_EN
U301
2.75V
X400
Battery
3.4~4.2V
U400
Figure 3-7 U402 circuit diagram
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 G1610
Page 1: ...Service Manual Model G1610 Service Manual G1610 P N MMBD0045701 Date February 2005 Issue 1 0 ...
Page 52: ...4 TROUBLE SHOOTING 51 Graph 4 14DCS TX Graph 4 15EGSM TX VC1 VC2 VC1 VC2 VC1 VC2 VC1 VC2 ...
Page 70: ...5 DISASSEMBLY INSTRUCTION 69 5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 ...
Page 71: ...5 DISASSEMBLY INSTRUCTION 70 Figure 5 3 Figure 5 4 ...
Page 72: ...5 DISASSEMBLY INSTRUCTION 71 Figure 5 5 ...
Page 73: ...5 DISASSEMBLY INSTRUCTION 72 Figure 5 6 1 3 2 4 Figure 5 7 1 2 3 ...
Page 74: ...5 DISASSEMBLY INSTRUCTION 73 Figure 5 8 4 2 3 1 2 1 Figure 5 9 ...
Page 75: ...5 DISASSEMBLY INSTRUCTION 74 Figure 5 10 ...
Page 86: ...7 BLOCK DIAGRAM 85 7 BLOCK DIAGRAM Power supply ...
Page 87: ... 86 ...
Page 108: ...12 AUTO CALIBRATION 107 12 3 Equipment Setup Figure 12 1 Equipment Setup ...
Page 111: ...12 AUTO CALIBRATION 110 ...