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
Содержание G1610
Страница 1: ...Service Manual Model G1610 Service Manual G1610 P N MMBD0045701 Date February 2005 Issue 1 0 ...
Страница 52: ...4 TROUBLE SHOOTING 51 Graph 4 14DCS TX Graph 4 15EGSM TX VC1 VC2 VC1 VC2 VC1 VC2 VC1 VC2 ...
Страница 70: ...5 DISASSEMBLY INSTRUCTION 69 5 DISASSEMBLY INSTRUCTION Figure 5 1 Figure 5 2 ...
Страница 71: ...5 DISASSEMBLY INSTRUCTION 70 Figure 5 3 Figure 5 4 ...
Страница 72: ...5 DISASSEMBLY INSTRUCTION 71 Figure 5 5 ...
Страница 73: ...5 DISASSEMBLY INSTRUCTION 72 Figure 5 6 1 3 2 4 Figure 5 7 1 2 3 ...
Страница 74: ...5 DISASSEMBLY INSTRUCTION 73 Figure 5 8 4 2 3 1 2 1 Figure 5 9 ...
Страница 75: ...5 DISASSEMBLY INSTRUCTION 74 Figure 5 10 ...
Страница 82: ...6 DOWNLOAD AND CALIBRATION 81 11 Wait until Sending Block is completed 1 Wait Until Sending Block is completed ...
Страница 86: ...7 BLOCK DIAGRAM 85 7 BLOCK DIAGRAM Power supply ...
Страница 87: ... 86 ...
Страница 101: ...11 STAND ALONE TEST 100 11 2 Standalone Test Equipment Setup GSM Test Equipment Power Supply RS 232 Cable PC JIG Phone ...
Страница 108: ...12 AUTO CALIBRATION 107 12 3 Equipment Setup Figure 12 1 Equipment Setup ...
Страница 111: ...12 AUTO CALIBRATION 110 ...
Страница 113: ...13 EXPLODED VIEW REPLACEMENT PART LIST 112 ...