Figure 4-83: Low Band (29.7-42/35-50 Mhz) Frequency Generation Unit Synthesizer Diagram - Motorola PR860 Detailed Service Manual

4-110
SWB+
Vdda
4V_3.3V
CLK
CSX
MODIN
DATA
R287
47K
Q288
PRE_IN
R289
3.9
Figure 4-83: Low Band (29.7–42/35–50 MHz) Frequency Generation Unit Synthesizer Diagram
C233
.01uF
U204
ADP3300
2
NR
5 IN 4
OUT
3 6
SD ERR
C232
1 C234
0.47uF 0.47uF
U200
LP2980
L225
3.28 Vdc
1 5
VIN VOUT
3 4
100uH
ON_OFF* NC
GND C298
C281 C299
C280
2.2uF .01uF
2.2uF 2 4.7uF
8
CLK
9
CEX
10
MODIN
7
DATA
30
SFIN
35
PVREF
21
R222 VBPASS
75K
1.57 Vdc
40
BIAS1
3.64 Vdc
39
BIAS2
R223
26
100K
SFCAP
27
SFBASE
32
PREIN
C258
18
2.2uF
REFSEL
42
CCOMP
17
C287
NC1
.01uF 29
1st Lo frequency NC2
31
NC3
R288
1K
VSF
4.56 Vdc
Y201
75Z03
17 MHz
2.7 V p-p
6 3
IN OUT
C236
100pF CR211
C242
47pF
R286
0
13 Vdc
C249 C247
4.7uF
.01uF
23
XTAL1
XTAL2 24
R230
L226
100
19
FREFOUT
41
2.2uH
MODOUT
15
C206
VMULT1
14 NP
VMULT2
12
VMULT3
11
VMULT4
48
U205
AUX1
1
LVFractN IC
AUX2
2
AUX3
3
AUX4 R224
37
200
TEST1
38
TEST2
C257
R225
510
43
IOUT .047uF
45
IADAPT
4
LOCK
46
ADAPTSW
28 R227 R228
SFOUT
16 100 C260 51
INDMULT
25 .01uF
WARP
R229 C261
C259
2K
0.47uF
0.47uF
C263
4.7uF
RECEIVE -47dBm SIGNAL AT 35.04MHz WITH 1K TONE.
Schematic Diagrams, Overlays, and Parts Lists: Low Band Section
R219
1.3 - 3.5 Vdc
47K
C237
2.7pF
C286
D210
K3 A3
.01uF
K2 A2
C285
K1 A1
.01uF
C284
.01uF
K3 A3
C283
K2 A2 R285
K1 A1
100
.01uF
D211
16.8MHZ
AUX2 3.23 Vdc RX / 0 Vdc TX
AUX3 0.15 Vdc RX / 3.25 Vdc TX
VCTRL 1.5 - 11 Vdc Low band - 17MHz 0.6V p-p
C256
.047uF
R239
1K
TP200
SH200
SHIELD
C255
.047uF
0 = UNLOCK
LOCK ZMY0130813-O
5V
TP201
SH201
SHIELD