LM2326 datasheet(1/19 Pages) NSC

Il numero della parte	LM2326

Spiegazioni elettronici	PLLatinum??Low Power Frequency Synthesizer for RF Personal Communications

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LMX2306/LMX2316/LMX2326

PLLatinum™ Low Power Frequency Synthesizer for RF

Personal Communications

LMX2306

550 MHz

LMX2316

1.2 GHz

LMX2326

2.8 GHz

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 lo-

cal 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 pro-

vide the feedback tuning voltage for a voltage controlled os-

cillator 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 - 4.0 mA at 3V.

The LMX2306/16/26 synthesizers are available in a 16-pin

TSSOP surface mount plastic package.

Features

n

2.3V to 5.5V operation

n

Ultra low current consumption

n

2.5V V

CC JEDEC standard compatible

n

Programmable or logical power down mode:

—I

CC = 1 µA typical at 3V

n

Dual modulus prescaler:

— LMX2306

8/9

— LMX2316/26

32/33

n

Selectable charge pump TRI-STATE® mode

n

Selectable FastLock™ mode with timeout counter

n

MICROWIRE™ Interface

n

Digital Lock Detect

Applications

n

Portable wireless communications (PCS/PCN, cordless)

n

Wireless Local Area Networks (WLANs)

n

Cable TV tuners (CATV)

n

Pagers

n

Other wireless communication systems

Functional Block Diagram

TRI-STATE® is a registered trademark of National Semiconductor Corporation.

FastLock™, PLLatinum™ and MICROWIRE™ are trademarks of National Semiconductor Corporation.

DS100127-1

April 2000

DS100127

www.national.com

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