SKY72300-21 Datasheet, PDF (19/23 Pages) Skyworks Solutions Inc. – SKY72300-21: Spur-Free, 2.1 GHz Dual Fractional-N Frequency Synthesizer

To Microprocessor
DATA SHEET • SKY72300-21 FREQUENCY SYNTHESIZER
3V
RF Out Main
J1
1
543 2
3V
Lock
Main
Detect
Output
<
VCC
2
VCC
3
C3
1 nF
R1
100 kΩ
3V
C11
1 nF
4
GND
1 _{Main VCO}
R4
C14
C15
R5
C17
C16
100 pF
Main Synthesizer Loop Filter
1
Clock
2
Mod_in
3 _{Mux_out}
4
VSUBdigital
5
GNDecl/cml
6
VCCcml_main
C5
7
Fvco_main
C7
8
Fvco_main
9
LD/PSmain
10 _{VCCcp_main}
11 _{CPout_main}
12
GNDcp_main
13
Xtalacgnd/OSC
14
Xtalin/OSC
C19
28
CS
27
Data
VCCdigital ²⁶
25
GNDdigital
24
VCCcml_aux
23
Fvco_aux
22
Fvco_aux
21
GNDcp_aux
20
CPout_aux
VCCcp_aux ¹⁹
LD/PSaux ¹⁸
17
GNDxtal
16
VCCxtal
15
Xtalout/NC
External Pad
Connection to
Ground
Y1
3V
C2
1 nF
3V
C1
1 nF
RF Out Auxiliary
J1
1
A
C4
C6
3V
3V
C10
1 nF
2
Auxiliary
VCO
4
GND
C8
R2
R3
C12
VCC
VCC ³
1
C9
C17
1 nF
Auxiliary Synthesizer Loop Filter
C18
3 V _R6
100 kΩ
>
Lock Detect
Auxiliary Output
C1427
Figure 16. SKY72300-21 Application Schematic
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
101217N • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice • September 11, 2009
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