FlexRadio Systems FLEX-1500, Service Manual

Page: 27 / 62

.1u
.1u
1u
TPS79318
TPS79318
10u 10u
1u
.1u
GND GND
CVT25-38.4
1.00k
1.20k
GND
.1u
GND
GND
TC1-1T
AD9951EP
GND GND
GND
+3.3V
1u .1u
1k
3.9k
GND
+3.3V +3.3V
.1u
+3.3V
+3.3V
+3.3V
.1u .1u
.1u .1u .1u
.1u
GND
GND
GND
.1u
GND
GND GND
0 0
.1u
.1u
68p
68p
68p
68p
68p
47p
330p
68p
GND
DDS
Copyright FlexRadio Systems 2009, 2010
C235
C238
C237
NR
4
EN
3
GND
2
IN
1
OUT
5
IC16
NR
4
EN
3
GND
2
IN
1
OUT
5
IC17
C236
C228
C230
C233
2
4
3
1
QG1
R55
R53
C244
1
3
6
4
2
T4
I/O_UPDATE
1
SYNC_CLK
45
REFCLK
9
REFCLK
8
CRYSTAL_OUT
10
IOUT
21
IOUT
20
DAC_RSET
24
SYNC_IN
44
OSK
46
PWRDWNCTL
35
RESET
36
CLKMODESELCT
11
LOOP_FILTER
12
DACBP
23
IOSYNC
37
SDO
38
CS
39
SCLK
40
SDIO
41
DVDD
2
DVDD
34
DGND
3
DGND
33
DGND
47
DGND
42
AVDD
4
AVDD
6
AVDD
13
AVDD
16
AVDD
18
AVDD
19
AVDD
25
AVDD
27
AVDD
29
AGND
5
AGND
7
AGND
14
AGND
15
AGND
17
AGND
22
AGND
26
AGND
28
AGND
30
AGND
31
AGND
32
IC18
DVDD_I/O
43
DGND
48
EXP
EXP
C248 C247
R54
R56
C246
5
1
3
6
4 2
CTRL
VDD
RFC
RF1
RF2 GND
K27 PE4259
C232 C231
C239 C240 C241
C234
C249
RFTP3 RFTP4
R76 R77
C19
C44
C140
C141
C145
C149
C159
C160 C142
C170
DDS-1.8V-DIGITAL DDS-1.8V-ANALOG
SPI-CLK/8
SPI-DATA/8
REF-SEL/11
20MHZ/1
SPI~CSDDS/8
DRESET/8
DDS/10
OUT GND
VCC
NC/TS