DS_S1M8837 Datasheet, PDF (27/29 Pages) Samsung semiconductor – FRACTIONAL-N RF/INTEGER-N IF DUAL PLL

FRACTIONAL-N RF/INTEGER-N IF DUAL PLL
S1M8836/37
TYPICAL APPLICATION CIRCUIT
V_DD
100pF 0.01µF
22Ω
0.1µF
Reference
Input ^1000pF
51Ω
RF Out
VCO
10pF
R3
C3 C2 ^R1
C1
100pF
10pF
R_in
V_P
100pF 0.01µF
V_DD
100pF 0.01µF
22Ω
9
8
7
OSC_in
foLD
10 foLD
VDDRFa GND_RF
6
f_inRF
V_DD
11 RF_EN
5
f_inRF
4
3
DGND CP_ORF
2
V_PRF
1
V_DDRF
OUT0 24
OUT1 23
0.1µF
12 IF_EN
V_DDIF 22 _0.1µF
CLCOK DATA
LE
GND_IF
f_inIF
13
14
15
16
17
f_inIF DGND CP_OIF V_PIF
18
19
20
21
22Ω
V_DD
From
Controller
1000pF
R_in
56pF
100pF
0.01µF
IF Out
<RF VCO Module : ALPS Part No>
. CDMA : UCVA4X103A
. K-PCS : UCVW4X102A
. US-PCS : UCVA3X120A
56pF
VCO
C13
R13
C12
R11
V_P
100pF
0.01µF
C11
 The role of Rin : Rin makes a large portion of VCO output power go to the load rather than the PLL. The value
of Rin depends on the VCO power level
27