3. TECHNICAL BRIEF
- 28 -
3.3 26 MHz Clock (VCTCXO)
The 26 MHz clock(X501) consists of a TCXO(Temperature Compensated Crystal Oscillator) which
oscillates at a frequency of 26 MHz. It is used within the Si4210, analog base band chipset (U100, AD6535),
digital base band chipset (U101, AD6527)
3.4 Power Supplies for RF Circuits (RF LDO)
Two regulators are used for RF circuits. One is MIC5255 (U504), and the other is one port of AD6535
(U100).
MIC5255 (U504) supplies power to transceiver (SI4210, U502). One port of AD6535 supplies power to
VCTCXO (X501). Main power (VBAT) from battery is used for PAM (SKY77328, U501) because PAM
requires high power.
(AFCDAC)
4
VCONT
1
26MHz
X501
2
GND
3
OUT
VCC
15K
R523
C548
1000p
2V75_VVCXO
C549
2.2u
AFC
Figure 3-5 VCTCXO CIRCUIT DIAGRAM
Supplier
Voltage
Powers
Enabled signal
U504(VRF)
2.85 V
U502
CLKON
U100(VVCXO)
2.75 V
X501
Battery(VBAT)
3.4 ~ 4.2 V
U501, U504
Table 3-2 RF POWER SUPPLIERS
26MHz
Summary of Contents for KG920
Page 3: ... 4 ...
Page 48: ...3 TECHNICAL BRIEF 49 3 8 2 AFE Analog Front End Figure 3 22 ...
Page 52: ...3 TECHNICAL BRIEF 53 3 8 5 MBGM01 5M CCD ISP Figure 3 25 ...
Page 55: ...3 TECHNICAL BRIEF 56 3 8 6 MV8620 5M back end IC Multi Media Function Figure 3 26 ...
Page 58: ...3 TECHNICAL BRIEF 59 3 9 MIDI IC YMU787 Figure 3 27 YMU787 BLOCKDIAGRAM ...
Page 108: ...4 TROUBLE SHOOTING 109 CIRCUIT WAVEFORM Figure 4 59 Graph 4 11 Figure 4 60 Figure ...
Page 109: ...4 TROUBLE SHOOTING 110 TEST POINT U602 FB602 U100 Q100 Q101 C113 C114 Figure 4 61 Figure 4 62 ...
Page 112: ...4 TROUBLE SHOOTING 113 Figure 4 67 Figure 4 68 CIRCUIT ...
Page 115: ...4 TROUBLE SHOOTING 116 WAVEFORM Graph 4 13 ...
Page 139: ...6 BLOCK DIAGRAM 140 6 BLOCK DIAGRAM Figure 6 1 ...
Page 148: ... 149 8 PCB LAYOUT ...
Page 149: ... 150 8 PCB LAYOUT ...
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