6881096C74-B May 25, 2005
Troubleshooting Procedures: UHF Range 2 (450–520 MHz) Band Main Board Troubleshooting 4-21
15
VMULT1 Not used
16
INDMULT Not used
17
— No connection
18
REFSEL Not used
19
FREFOUT Not used
20
AVDD 3.0-V supply (analog)
21
VBPASS Not used
22
GND Ground (analog)
23
XTAL1 16.8 MHz reference oscillator input
24
XTAL2 Not used
25
WARP Reference oscillator warp output
26
SFCAP Superfilter bypass node
27
SFBASE Superfilter control node for Q5752
28
SFOUT Superfilter output
29
— No connection
30
SFIN Superfilter supply input
31
— No connection
32
PREIN Prescalar input
33
GROUND Ground (prescalar)
34
PRE_VDD 3.0-V supply
35
PVREF Not used
36
DVDD 3.0-V supply (digital)
37
TEST1 Not used
38
TEST2 Not used
39
CPB2 Phase detector bias input
40
CPB1 Phase detector bias input
41
MODOUT Modulation output
42
CCOMP Not used
43
IOUT Phase detector normal mode output
44
GND Ground (phase detector)
45
IADAPT Phase detector adapt mode output
46
ADAPTSW Phase detector adapt switch
47
VCP High-voltage supply for phase detector
48
AUX1 Auxiliary logic output
Table 4-12. LV Frac-N U6751 Pin Descriptions (UHF Range 2) (Continued)
Pin No. Pin Name Description
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