Figure 7-20. Hud4022A/Hud4025B Frequency Generation Unit Overall Schematic (Sheet 2 Of 2) - Motorola ASTRO Digital XTL 5000 Detailed Service Manual

7-22
5V_Reg
B(,1),A(,1)
B(,1),A(,1)
L3751
560nH
C3750
C3806
100n
1uF
5V_Reg
IF6750
5V_Reg
TP6751
CLOCK
TEST_POINT
1 TP6750
TEST_POINT
1 B(,1),A(,1)
IF6752
SPI_CLK
TP6752
TEST_POINT
1
IF6753
DATA
SPI_DATA
TP6753
TEST_POINT
Syn_Sel
IF6754
1
SYN_SEL
IF6768
16_8_CONT
IF6756
16_8MHz
TP6754
1
TEST_POINT
IF6751
MOD_IN
IF6769 IF6770
FS_2 FS_3
IF6771 IF6772
DOUTA_2 DOUTA_3
IF6773 IF6774
CLKOUT_2 CLKOUT_3
IF6775 IF6776
PE_2 PE_3
IF6777 IF6778
PD_2 PD_3
IF6779 IF6780
PC_2 PC_3
F9.3V
IF6763
9.3V_1
L3752
560nH
C3811 C3751 C3820
IF6762
.022uF
100n 10uF
9.3V_2

Figure 7-20. HUD4022A/HUD4025B Frequency Generation Unit Overall Schematic (Sheet 2 of 2)

May 25, 2005
3.0 Volt Regulator
U3750
F3.0v
LP3985
3
VEN
1 5
VIN
VOUT
4
BYPASS
GND
2
C3826 C3807
.01uF 1uF
0 B(,1),A(,0)
F3.0v
L3753
C3828
2.2uH
.01uF
B(,1),A(,1)
B(,1),A(,1)
C3766
100n
Y3750
R3754
OSC1672A
16.8MHz 100K
4
VDD
B(,1),A(,1) 1 3 B(,1),A(,1)
VCONT
FOUT
R3750
C3831
1K
1000pF
GND
2
R3753
100K
R3761
10K
B(,1),A(,1)
0 B(,1),A(,0)
R3756 R3776
R3758
120.K
15.K 56.K
C3808
100.n
B(,1),A(,1) C3825 100.n
B(,1),A(,1)
Q3755
B(,1),A(,1)
Q3750
B(,1),A(,1)
B(,1),A(,1)
R3759
R3763 R3775
R3779
47.K
47.K 1.K 1.5K
B(,1),A(,1)
B(,1),A(,1)
C3775
R3774 0
470.p
B(,1),A(,1)
Schematics, Component Location Diagrams, and Parts Lists: HUD4022A/HUD4025B (VHF) Main Board
B(,1),A(,1)
L3755
2.2uH
C3768
100n
R3755
100K
U3752
TC7SH04
VCC
L3754
1uH
B(,1),A(,1)
B(,1),A(,1) 2 4
R3767 1
B(,1),A(,1)
NC NC
1K
C3824
100pF
R3768
330.
B(,1),A(,1)
C3830
1000pF
1 TP6755
TEST_POINT
NC
NC
B(,1),A(,1)
B(,1),A(,1)
B(,1),A(,1)
R3778
B(,1),A(,1)
22.K
C3773 C3823 B(,1),A(,1)
470.p 10uF
B(,1),A(,1)
B(,1),A(,1)
B(,1),A(,1)
Q3756 C3813
470.p
C3821 C3753
10uF 100n
B(,1),A(,1)
F3.0v 5V_Reg
B(,1),A(,1)
NP
R3784 R3785
0.
0.
0 B(,1),A(,0)
0 B(,1),A(,0)
L3756
B(,1),A(,1)
2.2uH
L3757
B(,1),A(,1)
2.2uH
C3769
100n
B(,1),A(,1)
C3762
100n
23
XTAL1
24
XTAL2 NC B(,1),A(,1)
8 19
CLK NC
FREFOUT B(,1),A(,1)
9 41 0 B(,1),A(,0)
CEX MODOUT
10 15
MODIN VMULT1 NC B(,1),A(,1)
7 14
DATA VMULT2 NC B(,1),A(,1)
B(,1),A(,1)
30 12
SFIN VMULT3
11
B(,1),A(,1)
VMULT4
U3751
35
B(,1),A(,1)
PVREF 63A27
21 48
B(,1),A(,1)
AUX1
VBPASS
1
AUX2
40 2
BIAS1 AUX3
39 3
BIAS2 AUX4
26 37
SFCAP TEST1 NC B(,1),A(,1)
27 38
TEST2
SFBASE NC B(,1),A(,1)
32
PREIN
43 B(,1),A(,1)
IOUT
45
0 B(,1),A(,0)
18
NC REFSEL IADAPT
4
42
NC CCOMP LOCK
46
ADAPTSW
28
17
NC SFOUT
NC1
16
29
NC NC2 INDMULT NC B(,1),A(,1)
25
31
NC NC3 WARP
R3836 C3752
51. 100n
B(,1),A(,1)
6881096C74-B