LMX2485E ,Delta-Sigma Low Power Dual PLL for RF Personal CommunicationsFeaturesSerial data for programming the LMX2485 istransferred through a three-line, high-speed (20- ..
LMX2485ESQ/NOPB ,Delta-Sigma Low Power Dual PLL for RF Personal Communications 24-WQFN -40 to 85 SNAS236G–OCTOBER 2005–REVISED JANUARY 20165 Pin Configuration and FunctionsRTW Package24-Pin WQFNT ..
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LMX2485E-LMX2485ESQ/NOPB
Delta-Sigma Low Power Dual PLL for RF Personal Communications
Phase
Comp
FinIF Charge
Pump CPoutIF
Ftest/LD
MUX Ftest/LD
Phase
8/9
16/17
Prescaler
B Counter
IF N Divider
A Counter
8/9/12/13
C Counter
RF N Divider
OSCin
IF R
Divider
RF R
Divider1X / 2X
RF LDModulator frequenciesisa direct function of the modulator• Features for Improved Lock Time order. Unlike analog compensation, the digital Fastlock/ Cycle Slip Reduction With Integrated feedback technique usedin the LMX2485is highlyinTime-Out Counter Which Requires Onlya delta-sigmaSingle-Word Write which• Wide Operating Range modulator– LMX2485 RF PLL: 500 MHzto 3.0 GHz lock time
requirementsof the system.– LMX2485E RF PLL:50 MHzto 3.0 GHz Useful Features Serial data for programming the LMX2485 is
transferred througha three-line, high-speed– Digital Lock Detect Output offers– Hardware and Software Power-Down Control– On-Chip Input Frequency Doubler.– RF Phase Detector Frequencyupto50 MHz– 2.5to 3.6V Operation With ICC= 5.0 mA directly modulated with information. The LMX2485
availableina 24-lead 4.0× 4.0× 0.8 mm
2 Applications Cellular Phones and Base Stations• Direct Digital Modulation Applications• Satellite and Cable TV Tuners• WLAN Standards
(1) Forall available packages, see the orderable addendum
Functional Block
