LMX2354 datasheet(1/23 Pages) NSC

Part #	LMX2354

Description	PLLatinum Fractional N RF/ Integer N IF Dual Low Power Frequency Synthesizer

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Manufacturer	NSC [National Semiconductor (TI)]

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LMX2354

PLLatinum Fractional N RF/ Integer N IF Dual Low Power

Frequency Synthesizer

LMX2354 2.5 GHz/550 MHz

General Description

The LMX2354 is part of a family of monolithic integrated

fractional N/Integer N frequency synthesizers designed to be

used in a local oscillator subsystem for a radio transceiver. It

is fabricated using National’s 0.5 µ ABiC V silicon BiCMOS

process. The LMX2354 contains quadruple modulus pres-

calers along with modulo 15 or 16 fractional compensation

circuitry in the RF divider. The LMX2354 provides a continu-

ous

divide

ratio

of

80

to

32767

in

16/17/20/21

(1.2 GHz–2.5 GHz) fractional mode and 40 to 16383 in

8/9/12/13 (550 MHz–1.2 GHz) fractional mode. The IF cir-

cuitry for the LMX2354 contains an 8/9 prescaler, and is fully

programmable. Using a fractional N phase locked loop tech-

nique, the LMX2354 can generate very stable low noise

control signals for UHF and VHF voltage controlled oscilla-

tors (VCOs).

For the RF PLL, a highly flexible 16 level programmable

charge pump supplies output current magnitudes from 100

µA to 1.6 mA. Two uncommitted CMOS outputs can be used

to provide external control signals, or configured to FastLock

mode. Serial data is transferred into the LMX2354 via a three

wire interface (Data, LE, Clock). Supply voltage can range

from 2.7V to 5.5V. The LMX2354 family features very low

current consumption; typically LMX2354 (2.5 GHz) — 7.0

mA. The LMX2354 are available in a 24-pin TSSOP surface

mount plastic package and 24-pin CSP.

Features

n

Pin compatible/functional equivalent to the LMX2350

n

Enhanced Low Noise Fractional Engine

n

2.7V to 5.5V operation

n

Low current consumption

LMX2354: I

CC = 7 mA typical at 3V

n

Programmable or logical power down mode:

I

CC = 5 µA typical at 3V

n

Modulo 15 or 16 fractional RF N divider supports ratios

of 1, 2, 3, 4, 5, 8, 15, or 16

n

Programmable charge pump current levels

RF 100 µA to 1.6 mA in 100 µA steps

IF 100 µA or 800 µA

n

Digital filtered lock detect

n

Available in 24-pin TSSOP and 24-pin CSP

Applications

n

Portable wireless communications (PCS/PCN, cordless)

n

Dual mode cellular telephone systems

n

Zero blind slot TDMA systems

n

Spread spectrum communication systems (CDMA)

n

Cable TV Tuners (CATV)

Functional Block Diagram

20004801

August 2001

DS200048

www.national.com

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LMX2354 Datasheet(PDF) 1 Page - National Semiconductor (TI)

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