Figure 8-10. Nud7120A Frequency Generation Unit (Vco) Circuit – 2 Of 2 - Motorola APX 5000 Service Manual

8-12
TP853
TEST_POINT
IN
DC_LIN_1_5V
IN
DC_SUPER_FILTER_5V
IN
DC_LIN_5V
DIG_CTRL_TR
IN
DIG_CTRL_E
IN
DIG_CTRL_F
IN
R764
1.2K
ANA_CHARGE_PUMP
IN
C762 C766
.039UF 6800PF
R759
680
R767
ANA_ADAPT_CHARGE_PUMP 68
IN
C760 C763 C765 C768 C770
.082UF .082UF .082UF .082UF .082UF
C783
2200PF
R761
C759
270
.22UF
R762
11K
RF_HP_MOD_OUT
IN
DIG_CTRL_VTUR1
IN
DIG_CTRL_UR2
IN
DIG_CTRL_VR
IN
DIG_CTRL_78T
IN
DIG_CTRL_D
IN
DIG_CTRL_C
IN
Figure 8-10. NUD7120A Frequency Generation Unit (VCO) Circuit – 2 of 2
ANA_VTUNE
C769
C703
.016UF
100PF
DNP
DC_LIN_1_5V
DC_SUPER_FILTER_5V
C791
C796
0.1UF
100PF
7 1
VTUNE POUT
DIG_CTRL_VTUR1 3 4
SEL1 NC NC
5
SEL2
DIG_CTRL_UR2
Y704
V0225AZ U709
309MHZ/379MHZ SKY13251
4
3
RF1 V1
5
6
NC RF2 V2
8
7
RF3 V3
1
RFC
DC_SUPER_FILTER_5V
C792
C795
0.1UF
100PF
7 1
VTUNE POUT
DIG_CTRL_VR
3 4
NC
SEL1 NC
5
SEL2
DIG_CTRL_78T
Y707
V0225AZ
266MHZ/809MHZ
U710
SKY13251
3 4
V1 RF1 NC
6 5
V2 RF2
7 8
V3 RF3
1
RFC
RF_ESCORT
OUT
C799
100PF
C801
6.8PF
RF_ESCORT_DIV2_NONINV R710
200
IN
L802
C798
33NH
1000PF
C800 C803
R709 R711
22PF 22PF 68 68
L806 R811
39
390NH
R819
C814 C816 L817
R809
1000PF 33PF 390NH 270
5.6K
R807
22K
Q712 2 5 Q712 R813 C709
R705
BC858CD 680
BC858CD 10 220PF
C820
220PF
R808
C701 R812 C813 R708
82K
82
220PF 1PF Q713 100
NE662M04
R818
4 8.2
3
C810 R815
24 C704
220PF
62PF
DC_LIN_1_5V
L701
R773
390NH
5.6K
C771
R772
C775 C777
100PF
33
Q774
2 1000PF 33PF
NE68519
C779
100PF
R776
39
R778
180
Schematics, Boards Overlays, and Parts Lists: Transceiver (RF) Boards: VHF
C831 R713
100PF 10
Q714
R712 R714
NTZD3154N
560 560
1 6
2 5
NC
3 4
NC
NC
DC_LIN_1_5V
R832
15
L821
390NH
C838 C844 L846 R849
R827
1000PF 47PF 390NH 560
6.2K
R822
20K
Q703
Q703 C851
2 5
BC858CD
BC858CD 220PF
R823 C702
R833
220PF
56K Q842
100
NE662M04
C830 R840
220PF 15
4
3
TP780
TEST_POINT
RF_PRESCALAR
TL_RX_LO
OUT
R848 C836 R716
0 TL_TX_LO
15 47PF
OUT
R717
R701 R715
0 0
100
DNP DNP
OUT