LMX2306TMX

General 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 0.5u 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 LMX2306716/26 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.sv.The LMx2306i16/26 feature ultra low current consumption; LMx2306 - 1.7 mA at 3 v, LMX2316- 2.5 mA at 3v, and LMX2326- 4.0 mA at 3v.

The LMX2306/16/26 synthesizers are available in a 16-pin TSSOP surface mount plastic package.

Features

● 2.3V to 5.5v operation

● Ultra low current consumption

● 2.5V ECJEDECstandard compatible

● Programmable or logical power down mode:

 一cc= 1 uA typical at3V

●  Dual modulus prescaler:

 —LMX230689

 —LMX2316/2632/33

● Selectable charge pump TRI-STATEmode

● Selectable FastLockTM mode with timeout counter

● MICROWIREIM Interface

● Digital Lock Detect

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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