SKY72310 Datasheet, PDF (2/19 Pages) List of Unclassifed Manufacturers – SKY72310: Spur-Free, 2.1 GHz Single Fractional-N Frequency Synthesizer

DATA SHEET • SKY72310 FREQUENCY SYNTHESIZER
This capability can eliminate the need for In-phase and
Quadrature (I/Q) Digital-to-Analog Converters (DACs), quadrature
upconverters, and IF filters from the transmitter portion of the
radio system.
The device package and pinout for the 24-pin Quad Flat No-Lead
(QFN) package are shown in Figure 1. Figure 2 shows a functional
block diagram for the SKY72310.
VCCecl/cml 1
Fvco_main ²
Fvco_main 3
LD/PS_main 4
VCCcp_main 5
CPout_main 6
24 23 22 21 20 19
18 N/C
17 _N/C
16 N/C
15 N/C
14 N/C
13 N/C
7 8 9 10 11 12
S1258
Figure 1. SKY72310 Pinout, 24-Pin QFN
(Top View)
Data
Clock
CS
Mod_in
Serial
Interface
MSB/LSB Dividend
Registers
Divider
Reference Frequency
Dividers
PD/Charge Pump
& Pwr-Dn/Mux Out
Control
Modulation
Unit
Mux
ΔΣ
18-Bit
Fvco_main
Fvco_main
Main
Divider
Fractional
Unit
Reference
Frequency
Oscillator
Main
Divider
Fpd_main
Fref_main
Main
Phase/Freq.
Detector
and
Charge Pump
Fref
Reference
Frequency
Oscillator
Lock Detection or
Power Steering
CPout_main
LD/PS_main
Figure 2. SKY72310 Functional Block Diagram
Mux_out
S1057
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [e-mail] • www.skyworksinc.com
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July 30, 2008 • Skyworks Proprietary and Confidential information • Products and Product Information are Subject to Change Without Notice • 200705E