Motorola ASTRO Digital XTL 5000 Detailed Service Manual page 159

Troubleshooting Procedures: UHF Range 1 (380–470 MHz) Band Main Board Troubleshooting
Table 4-9. LV Frac-N U6751 Pin Descriptions (UHF Range 1) (Continued)
Pin No.
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
6881096C74-B
Pin Name Description
VMULT1 Not used
INDMULT Not used
— No connection
REFSEL Not used
FREFOUT Not used
AVDD 3.0-V supply (analog)
VBPASS Not used
GND Ground (analog)
XTAL1 16.8 MHz reference oscillator input
XTAL2 Not used
WARP Reference oscillator warp output
SFCAP Superfilter bypass node
SFBASE Superfilter control node for Q5752
SFOUT Superfilter output
— No connection
SFIN Superfilter supply input
— No connection
PREIN Prescalar input
GROUND Ground (prescalar)
PRE_VDD 3.0-V supply
PVREF Not used
DVDD 3.0-V supply (digital)
TEST1 Not used
TEST2 Not used
CPB2 Phase detector bias input
CPB1 Phase detector bias input
MODOUT Modulation output
CCOMP Not used
IOUT Phase detector normal mode output
GND Ground (phase detector)
IADAPT Phase detector adapt mode output
ADAPTSW Phase detector adapt switch
VCP High-voltage supply for phase detector
AUX1 Auxiliary logic output
4-15
May 25, 2005