Figure 8-9. Vhf Frequency Generation Unit (Synthesizer) Circuit – 1 Of 2 - Motorola ASTRO XTSTM 4000 Detailed Service Manual

8-10
V3A V5A
V5A
V3A
CLK
CSX
DATA
R1
SCEN
R2
R218
10K
V3A
U203
AD5320BRT
8
5 7
SSCK SCLK
6
SSFS SYNC
1 2
VOUT
4
SSTD DIN
1
6
C221
0.10uF
PRESC
Figure 8-9. VHF Frequency Generation Unit (Synthesizer) Circuit – 1 of 2
May 28, 2008
V3A
C210
0.10uF
V5A
C250
0.10uF
V3A
F4
G1
Q200
H1
F1
E10
VSF
B10
R205
NC
G6
NC
43K
D7
V3A
R204
C215 A7
82K
H10
0.10uF
G10
NC
D10
CLK
C220
SHDN 10uF
G5
NC
R216
5 D6
IN OUT NC
8.2K
G4
COM NC
C337
F10
OS 220pF NC
F7
NC
FL200
MAX7414
V3A
L208
2.2uH
R215
1
VCONT
10K
C235
100pF
V3A
L204
L203
2.2uH
2.2uH
VCP
C211
0.10uF
C207 C206
0.10uF 10uF
V5A
K9
XTAL1
K10
XTAL2 NC
K6
CLK_CLK FREFOUT NC
A6
EN_CEX MODOUT
K4
MODIN VMULT1
K3
DATA VMULT2 NC
K1
SFIN VMULT3
J1
VMULT4
U202
PVREF 35U92
A1
VBYPASS AUX1 NC
B1
AUX2 NC
C1
CPB1 AUX3
D1
CPB2 AUX4 NC
A9
SFCAP TEST1 NC
A8
SFBASE TEST2 NC
PREIN
A5
IOUT
A4
REFSEL IADAPT
E1
CCOMP LOCK
A3
VSF
ADAPTSW NC
G7
NC1 SFOUT
K5
NC2 INDMULT NC
J10
NC3 WARP
C230 C231
330pF .01uF
V5A
L202
C233
2.2uH
0.10uF
R201
33K
C236
C234
3
OUPUT
.01uF
1000pF
5
NC1
6
NC2
7
Y200
NC3
DSA321SD 8
NC4
16.8MHz
Schematics, Board Overlays, and Parts Lists – VHF: Transceiver (RF) Section
K3 A3
1 6
K2 A2
C208 2 5
K1 A1
3 4
D202
0.10uF
C205
0.10uF
C202
K3 A3
1 6
K2 A2
2 5
K1 A1
0.10uF
3 4
C201
D201
0.10uF
C204
0.10uF
R210
220
C222 C217 C218 C219
R217
4700pF .047uF .047uF 2000pF
680
R212
82
2
L207
1uH
C224 C225 C226 C227
1
0.1uF 0.1uF 0.1uF 0.1uF
C232
10uF
R213
10K
C209
0.10uF
R202
2K
4 5 C213
R207 L205
1
3
1uH
2 U201 100 1000pF
LMH6723
R208
33K
V3A
L201
2.2uH
C203
2.2uF
AUX3
VCTRL
C242 C241
0.1uF 0.1uF
LOCK
C229
100pF
F168
C214
100pF
6871620L01-C