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Features
2.3V to 5.5V operation
Ultra low current consumption
2.5V VCC JEDEC standard compatible
Programmable or logical power down mode:
ICC = 1 μA typical at 3V
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
Description The LMX2306/16/26 are monolithic, integrated frequency synthesizers with prescalers that are designed to be used to generate
a very stable low noise signal for controlling the local oscillator of an RF transceiver. They are fabricated using National's
ABiC V silicon BiCMOS 0.5μ process.
The LMX2306 contains a 8/9 dual modulus prescaler while the LMX2316 and the LMX2326 have a 32/33 dual modulus prescaler. The
LMX2306/16/26 employ a digital phase locked loop technique. When combined with a high quality reference oscillator and loop
filter, the LMX2306/16/26 provide the feedback tuning voltage for a voltage controlled oscillator to generate a low phase
noise local oscillator signal. Serial data is transferred into the LMX2306/16/26 via a three wire interface (Data, Enable,
Clock). Supply voltage can range from 2.3V to 5.5V. The LMX2306/16/26 feature ultra low current consumption; LMX2306 - 1.7
mA at 3V, LMX2316 - 2.5 mA at 3V, and LMX2326 - 4.7 mA at 3V.
The LMX2306/16/26 synthesizers are available in a 16-pin TSSOP surface mount plastic package.
Applications
Portable wireless communications (PCS/PCN, cordless)
Wireless Local Area Networks (WLANs)
Cable TV tuners (CATV)
Pagers
Other wireless communication systems
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