Figure 8-58. Nuf6750A Frequency Generation Unit (Vco) Circuit – 2 Of 2 - Motorola APX 5000 Service Manual
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8-90
TP853
TEST_POINT
DC_LIN_1_5V
IN
DC_SUPER_FILTER_5V
IN
DC_LIN_5V
IN
DIG_CTRL_TR
IN
DIG_CTRL_G
IN
DIG_CTRL_F
IN
R764
1.2K
ANA_CHARGE_PUMP
IN
C762
C766
C769
.039UF
6800PF
.016UF
R759
680
R767
ANA_ADAPT_CHARGE_PUMP
68
IN
C760
C763
C765
C768
C770
.082UF
.082UF
.082UF
.082UF
.082UF
C783
2200PF
C759
R761
.22UF
270
R762
11K
RF_HP_MOD_OUT
IN
DIG_CTRL_7T8R
IN
DIG_CTRL_8T7R
IN
DIG_CTRL_VR
IN
DIG_CTRL_78T
IN
DIG_CTRL_D
IN
DIG_CTRL_A
IN
Figure 8-58. NUF6750A Frequency Generation Unit (VCO) Circuit – 2 of 2
U710
SKY13251
3
4
V1
RF1
6
5
V2
RF2
7
8
V3
RF3
1
RFC
C703
100PF
DNP
DC_LIN_1_5V
L806
R811
390NH
39
R809
5.6K
R807
22K
2
Q712
BC858CD
DC_SUPER_FILTER_5V
C791
R808
C701
0.1UF
82K
220PF
R815
C810
C794
220PF
24
39PF
7
1
VTUNE
POUT
3
4
SEL1
NC
NC
5
SEL2
Y706
V0225AZ
758MHZ/868MHZ
U709
SKY13251
NC
4
V1
3
RF1
5
V2
6
RF2
8
V3
7
RF3
RFC
1
CGND
NC
DC_SUPER_FILTER_5V
C792
0.1UF
C795
C771
100PF
100PF
7
1
VTUNE
POUT
3
4
SEL1
NC
NC
5
SEL2
Y707
V0225AZ
266MHZ/809MHZ
Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: 700–800 MHz
1
2
3
NC
NC
DC_LIN_1_5V
C830
220PF
C814
C816
L817
R819
1000PF
33PF
390NH
270
5
R813
C820
C709
Q712
R705
680
220PF
BC858CD
10
220PF
R812
R708
C813
100
82
1PF
Q713
NE662M04
R818
4
8.2
3
C704
62PF
DC_LIN_1_5V
L701
R773
390NH
5.6K
C775
C777
R772
1000PF
33PF
33
2
Q774
NE68519
C779
R776
100PF
39
R778
180
C831
R713
100PF
10
TL_RX_LO
Q714
R712
R714
NTZD3154N
560
560
6
5
NC
4
NC
R832
L821
15
390NH
C838
C844
L846
R849
R827
1000PF
47PF
390NH
560
6.2K
R822
20K
Q703
Q703
2
5
C851
R848
BC858CD
BC858CD
220PF
15
R823
C702
R833
R701
56K
220PF
100
100
Q842
R840
NE662M04
15
4
3
TP780
TEST_POINT
RF_PRESCALAR
OUT
C836
R716
47PF
0
TL_TX_LO
OUT
R715
R717
0
0
DNP
DNP
OUT
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