Figure 9-281.900 Mhz Synthesizer Schematic Diagram - Motorola HT Series Detailed Service Manual

9-476
3
4
A3 K3
2
5
C244
A2 K2
1
6
.01uF
A1 K1
R200
100 CR201 C245
100
.01uF
C246
.01uF
4 3
A3 K3
5 2
C247
A2 K2
6 1
.01uF
A1 K1
R218
CR202
33K
33K
C208
0.1uF 0.1uF
C212
0.1uF
0.1uF
CLK_1_FN CLK_2_FN
CLK
CSX
CSX_1_FN
C219
MODIN
47pF
C221
47pF
C227
L203
56pF
PRESC_1_FN 6.8nH
PRESC
1
C228
1.2pF
2
-20dBm RX VCO
-35dBm Second Harmonic RX VCO
-18.5dBm TX VCO
-33.5dBm Second Harmonic TX VCO
All values above are 'typical'
Measured with HP85024A
High Frequency Probe
Figure 9-281. 900 MHz Synthesizer Schematic Diagram
C206
0.1uF
.01uF
.01uF
.01uF
5V
(SOURCE)
.01uF 12.8V (Typical)
C203
C209 C204
10uF 10uF 0.1uF
R222
0
C243
NU
22pF C233
R219 R220
22pF
0.1uF
150 150
150 150
8
CLK
9
CEX
MODIN_1_FN
DATA_1_FN 10
MODIN
7
DATA DATA
C222 30
DATA_2_FN SFIN
47pF
35
PVREF
21
C223
VBPASS
47pF
40
BIAS1
39
BIAS2
26
SFCAP
27
SFBASE
32
PREIN
18
REFSEL
42
CCOMP
C229
2.2uF 17
NC1
29
NC2
31
NC3
VSF_1_FN
VSF
C232 C234
47pF 10uF
4.6V
SH201 SH202
SHIELD SHIELD
1 1
SYNTHESIZER BOTTOM SHIELD SYNTHESIZER TOP SHIELD
C220
L200
47pF
2.2uH
C207
2.2uF
U202
ADP3300
GND
5V_1_FN
5V_2_FN ERR SD
6 3
OUT IN
4 5
C200 NR
2
2.2uF
C201 C240
56pF 47pF
R223
0
C213 C205 C215 C214
0.1uF 0.1uF 0.1uF 2.2uF
23
XTAL1
24
XTAL2
16_8MHz_1_FN 16_8MHz_2_FN
19
16.8MHz
FREFOUT
41
MODOUT
15
VMULT1
AUX4_1_FN
Q201
VMULT2 14
AUX4
12
VMULT3
11 1
VMULT4
48
AUX1
1 2
AUX2 C224
2
47pF
AUX3
U201
3
AUX4
63A27
3 4
37
TEST1
38
5V
TEST2
43
IOUT
45
IADAPT
4
LOCK
46
LOCK_1_FN
ADAPTSW
28
SFOUT
TEST_POINT
16 C230
INDMULT TP201 R214 47K
25 1 47pF
WARP
R211
47K
For crystal
NU
2.2 to 2.7V at room temp
Y201
C242
75Z04
47pF
NU
6 3
IN OUT
1
C236
CR203 1.6pF
NU NU
1 2
C235
56pF
NU
2
1
C237
R212
330pF
1MEG
NU
2
NU
900 MHz Circuit Board/Schematic Diagrams and Parts List (PCB 8471203M01)
200-249
250-299
500-599
800-849
850-899
SWB_PLUS_1_FN SWB_PLUS_2_FN
SWB+
C202
2.2uF
1
U203
VIN
LP2980
4V_3.3V_1_FN
2
GND
C210 C211
47pF 2.2uF
L202
2.2uH
Vdda_1_FN
C216 C217
Vdda_2_FN
47pF 2.2uF
Vdda
3.3V
C218
R202
0.1uF
3.9K
R203
R204 C801 C802 C803 C804
33
120
0.47uF 0.1uF 0.1uF 0.1uF
NU NU NU
R5_2_FN
R5
C249
47pF
C226 R209
.068uF 1.5K
R210
680
LOCK
2
L204
12uH
1
Q202
3 4
2
1
Y200
C241
16.8MHz
56pF
2 4
GND VCC
Vdda
C238
45J68
0.1uF
FGU Schematic References
Synthesizer
VCO
Switches (Shared w/ Switches Sect.)
Synthesizer
Flutter Fighter
4V_3.3V
Steering Line DC Voltage
2 to 9V in RX mode
3 to 11V in TX mode
TP202
1
C805
0.1uF
NU
C225
.047uF
VCTRL_1_FN
VCTRL
AUX3_5V
AUX3_5V_1_FN