Figure 5-23. 700 Mhz Frequency Synthesizer Schematic Diagram - Motorola HT1250-LS+ Service Manual

Schematic Diagrams, Overlays, and Parts Lists
SWB+
7.5VDC
Vdda
CLK
CSX
MODIN
DATA
VSF
4.6V
PRESC
U202
ADP3300
GND
SD ERR
3 6
IN OUT
5 4
NR
L201
2
C201 C202 C203
C204 2.2uH
2.2uF 68pF 56pF
2.2uF
C205
68pF
1
U203
VIN
LP2980
2
GND
C215 C216
10uF 68pF
L202
2.2uH
C217 C218 C219 C220 C221 C222
2.2uF 68pF 2.2uF 0.1uF 0.1uF 0.1uF
R207
C229
C227 C230
12K
C228 68pF
68pF 68pF
68pF
56K
R208
C231
C232
68pF
10uF
-20dBm RX VCO
-18.5dBm TX VCO
All values above are 'typical'
Measured with HP85024A
High Frequency Probe
C235
L203
68pF
6.8nH
1
C234
1.2pF
2
C209
C206 C207 C208
0. 1uF
2.2uF 0.1uF 0.1uF
0.1uF
R203
100 10 0
R204
R202
33K
33K
NU
C210
0
0.1uF 0. 1uF
12.8V (Typical)
R201
C224
C223 C225
10uF 10uF
0.1uF
23
XTAL1
24
XTAL2
8 19
CLK FREFOUT
9 41
CEX MODOUT
10 15
MODIN VMULT1
7 14
DATA VMULT2
30 12
SFIN VMULT3
11
VMULT4
35
PVREF
21 48
VBPASS AUX1
1
AUX2
40 2
BIAS1 U201 AUX3
39 3
BIAS2 63A27 AUX4
26 37
SFCAP TEST1
27 38
SFBASE TEST2
32
PREIN
43
IOUT
18 45
REFSEL IADAPT
42 4
CCOMP LOCK
46
C233
ADAPTSW
17 28
2.2uF
NC1 SFOUT
29 16 C236
NC2 INDMULT
31 25 68pF
NC3 WARP
C237 R209
.01uF 100
Vdda
C238
0.1uF
1
TP201
R210 47K
1 3
OUT
VCON
Y200
C239 C240
16.8MHz
68pF 68pF
5V
C529 C531
68pF 68pF
.0 1uF
C211
.01uF
4 3 .0 1u F
A3 K3
5 2
C212
A2 K2
1
6
.01uF
A1 K1
. 0 1uF
CR201 C213
.01uF
4 3
A3 K3 . 0 1uF
5 2
C214
A2 K2
6 1
.01uF
A1 K1
CR202
R205
150
C226
22pF
R206 Q201
150
5
4
3
C250
68pF
Q202
3
5V
4
5
R215
330
L204
C241 R214
12uH
.047uF 1.3K
C244
C243
.022uF
470pF
R213
120
C242
R211
0.1uF
TP202
3.9K
1
R212
C245
C246 C247
33
0.47uF
NU NU

Figure 5-23. 700 MHz Frequency Synthesizer Schematic Diagram

5-29
16.8MHz
NC
R5
2
C251
68pF
2
AUX3_5V
AUX4
VCTRL
Steering Line DC Voltage
2 to 9V in RX mode
3 to 11V in TX mode
LOCK