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LG LG-A270 - Guidelines for Safe and Efficient Use; Radio Frequency Exposure (SAR)

LG LG-A270
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3. TECHNICAL BRIEF
- 24 -
Copyright © 2012 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
3.4 Crystal(26 MHz, X100)
Figure. 3.4.1 Clock distributions inside the MT6251.
These blocks with shadow are analog circuits.
Copyright © 2012 LG Electronics. Inc. All right reserved.
O nly for training and service purposes
LGE Internal Use Only
21
3.4 Crystal(26 MHz, X100)
3. TECHNICAL BRIEF
Figure. 3.4.1 Clock distributions inside the MT6251.
These blocks with shadow are analog circuits.
There are two major time bases in the MT6251. For the faster one is the 26MHz clock originating from the digital
control oscillator(DCXO) of RF chip. This signal is then converted to the square-XBWF TJHOBM UISPVHI $-,425IF
other time base is the 32.768 KHz clock generated by an on-chip oscillator connected to an external crystal .
Figure 3.4.1 shows the clock sources as well as their utilizations inside the chip.
(624mhz)
(624mhz)
UPLL_624M_CK
UPLL_48M_USB_CK
MPLL_CK
CLKSQ_26M_CK
FUSB_48M_CK
FUSB_78M_CK
FGSM_52M_CK
TEST_CK
TEST_CK
TEST_CK
HDSP_104M_CK
HSF_78M_CK
HBUS_78M_CK
TEST_CK
TEST_CK
HMCU_78M_CK
HMCU_78M_CK
HBUS_78M_CK
HSF_78M_CK
HDSP1_104M_CK
HDSP2_104M_CK
FGSM_52M_CK
FUSB_78M_CK
TEST_CK
FUSB_48M_CK
upllsel
upllsel
upllsel
mpllsel
mpllsel
mpllsel
hbus_divcks
sfpllsel
hsf_divcks
hdsp_divcks
dspllsel
FHCTL_MPLLSEL
(frequency hopping switch)
104M
52M
78M
48M
104M
104M
78M
78M
CLKSW_TOP
GSMRF
ABB
26MHz
DCXO
MPLL
UPLL
UPLLDIV
MPLLDIV
USB PHY
HMCUCNT
HSFCNT
EN
EN
GG
EN
GG
EN
GG
EN
GG
HDSP1_EN
HDSP2_EN
HDSP2_DCM
HDSP1_DCM
HSF_DCM
HBUS_DCM
divcks
divcks
divcks
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
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