LG KE970 Service Manual page 59

3. TECHNICAL BRIEF
VBIAS
LBAND_PAM_IN
R410
HBAND_PAM_IN
0
R417 R418 R412
NA NA NA
Figure 34 RF transceiver PMB7262 SMARTi-PM schematic
GSM850 GSM900
2V85_RF
1V5_RF 2V85_RF
C416 C417 C418
C419
2.5p 2.5p
2.2p
2.2p
C424 C425
0.1u 0.1u
L403
L402
18nH
22nH
FE2
33
VBIAS
34
VDDTX1V5
R409
35
TX1
0 36
TX2
37
VDDTX2V8
38
VDDMIX2V8
R413
39
R415
C438 C439 GND3
NA
40
10
0.1u 0.1u
GND4
41
1V5_CORE 2V85_RF
R421
10
C445 C446
0.1u 0.1u
DCS1800 PCS1900
C420 C421 C422 C423
1.5p 1.5p 1.2p 1.2p
L404
L405
5.6nH
5.6nH
2V85_RF
1V5_RF
C432 C433
0.1u 0.1u
(PIN21) (PIN20)
VDDRX2V8
20 C436
VDDRX1V5
U403
19 R411 47n
VCO_RC
PMB6272
18 820
VDDVCO2V8
17
EN
16
VDDXO2V8
15
FSYS1
14
GND1
13
C440
100p
C441
1000p
BT_CLK
R422
RF_CLK
0
R423
RF_DA
0
R424
QX
0
C447 C448
NA NA
R425
Q
0
R426
IX
0
C449 C450
NA NA
R427
I
0
- 60 -
2V7_VCXO
R408
C434 0
0.1u
C435
0.1u
R416
0
RF_EN
C437
26MHZ_MCLK
1000p
2V7_VCXO
R419
0
R420
X401
620
3 1
OUT VCONT
C442 C443
4 2
VCC GND 22p NA
C444
26MHz
1uF
AFC