Motorola HT Series Service Manual page 42


%RWK WKH QRUPDO DQG DGDSW FKDUJH SXPSV JHW WKHLU VXSSO\ IURP WKH FDSDFLWLYH YROWDJH PXOWLSOLHU
PDGH XS RI & & & & & DQG WULSOH GLRGHV ' DQG ' 7KLV FLUFXLW SURYLGHV
9 DW 8 SLQ 
DATA (U409 Pin 100)
CLOCK (U409 Pin 1)
CSX (U409 Pin 2)
MOD IN (U404 Pin 40)
+5V (U204 Pin 4)
5,20,34,36
(U400 Pin 1)
Reference
Oscillator
Voltage
Multiplier
 9ROWDJH &RQWURO 2VFLOODWRUV 9&2
 5HFHLYH 9&2
7KH UHFHLYH 9&2 LV D &ROSLWWV W\SH GHVLJQ DQG XVLQJ WZR DFWLYH GHYLFHV LQ SDUDOOHO 4 DQG 4
7KH RVFLOODWRU LV SRZHUHG RII RI WKH  YROW VXSHU ILOWHU VXSSO\ ZKHQ WKH $8; OLQH JRHV ORZ 7KH
RVFLOODWRU RSHUDWHV IURP  WR  0+] IRU UDQJH  DQG  WR  0+] IRU UDQJH  7KH IUHTXHQF\
LV WXQHG E\ YDUDFWRU GLRGHV &5 DQG &5
 7UDQVPLW 9&2
7KH WUDQVPLW 9&2 LV D +DUWOH\W\SH GHVLJQ ZLWK DFWLYH GHYLFHV 4 7KH RVFLOODWRU LV SRZHUHG RII RI
WKH  YROW VXSHU ILOWHU VXSSO\ ZKHQ WKH $8; OLQH JRHV ORZ 7KH RVFLOODWRU RSHUDWHV IURP   WR 
0+] IRU 5DQJH  DQG  WR  0+] IRU 5DQJH  7KH IUHTXHQF\ LV WXQHG E\ YDUDFWRU GLRGHV LQ 8
1RWH WKDW WKH YDOXHV RI WKH LQGXFWLYH WDS / DQG /  DQG WKH FDSDFLWRU & ZKLFK FRXSOHV WKH
YDUDFWRU WR WKH RVFLOODWRU WDQN YDU\ EHWZHHQ WKH UDQJHV
 %XIIHU
%RWK WKH UHFHLYH DQG WUDQVPLW 9&2 DUH IHG WR D EXIIHU DPSOLILHU 4 7KLV LV D %-7 DPSOLILHU WKDW
ERRVWV WKH VLJQDO OHYHOV WR  G%P DQG SURYLGHV UHYHUVH LVRODWLRQ WR WKH RVFLOODWRUV 7KH DPSOLILHU LV
SRZHUHG RII WKH  YROW VXSHU ILOWHU VXSSO\ DQG WKH IHHG QHWZRUN LV FRPELQHG ZLWK WKH WUDQVPLW ILOWHU
7
DATA
8
CLK
9
CEX
10
MODIN
13,30
V , DC5V
CC U205
V , 3.3V
Low Voltage
DD
Fractional-N
23
XTAL1
Synthesizer
24
XTAL2
25
WARP
32
PREIN
47
VCP
VMULT2
14
)LJXUH  /RZ %DQG 6\QWKHVL]HU %ORFN 'LDJUDP
7KHRU\ RI 2SHUDWLRQ 9ROWDJH &RQWURO 2VFLOODWRUV 9&2
4
LOCK
19
FREFOUT
6,17,22,29,31,33,44
GND
43
IOUT
45
IADAPT
41
MODOUT
1
AUX2
2
AUX3
28
SFOUT
40
BIAS1
39
BIAS2
VMULT1
15
Prescaler In
LOCK (U409 Pin 56)
FREF (U303 Pin 21 & U404 Pin 34)
Steering
2-Pole
Line
Loop Filter
Switching
Network
Voltage
Controlled
Filtered 4.3V
Oscillators
(First Stage of PA)
LO RF
Injection
TX RF
Injection