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LMX2306TM-LMX2306TMX-LMX2316TM-LMX2316TMX-LMX2326TMX
550 MHz PLLatinum Low Power Frequency Synthesizer for RF Personal Communications
LMX2306/LMX2316/LMX2326
PLLatinum™ Low Power Frequency Synthesizer for RF
Personal Communications
LMX2306 550 MHz
LMX2316 1.2 GHz
LMX2326 2.8 GHz
General DescriptionThe LMX2306/16/26 are monolithic, integrated frequency
synthesizers with prescalers thatare designedtobe usedto
generatea very stable low noise signalfor controlling the
local oscillatorofan RF transceiver. They are fabricated
using National’s ABiCV silicon BiCMOS 0.5µ process.
The LMX2306 containsa 8/9 dual modulus prescaler while
the LMX2316 and the LMX2326 havea 32/33 dual modulus
prescaler. The LMX2306/16/26 employa digital phase
locked loop technique. When combined witha high quality
reference oscillator and loop filter, the LMX2306/16/26 pro-
vide the feedback tuning voltagefora voltage controlled
oscillatorto generatea low phase noise local oscillator sig-
nal. Serial datais transferred into the LMX2306/16/26viaa
three wire interface (Data, Enable, Clock). Supply voltage
can range from 2.3Vto 5.5V. The LMX2306/16/26 feature
ultra low current consumption; LMX2306- 1.7 mAat 3V,
LMX2316- 2.5 mAat 3V, and LMX2326- 4.7 mAat 3V.
The LMX2306/16/26 synthesizers are availableina 16-pin
TSSOP surface mount plastic package.
Features 2.3Vto 5.5V operation Ultra low current consumption 2.5V VCC JEDEC standard compatible Programmableor logical power down mode:
—ICC=1µA typicalat3V Dual modulus prescaler: LMX2306 8/9 LMX2316/26 32/33 Selectable charge pump TRI-STATE® mode Selectable FastLock™ mode with timeout counter MICROWIRE™ Interface Digital Lock Detect
Applications Portable wireless communications (PCS/PCN, cordless) Wireless Local Area Networks (WLANs) CableTV tuners (CATV) Pagers Other wireless communication systems
Functional Block DiagramMarch 2004
LMX2306/LMX2316/LMX2326
PLLatinum
Low
Power
Frequency
Synthesizer
for
Personal
Communications
