LMX2353TMX Datasheet

IC型號：
LMX2353TMX
PDF描述：
PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesize...
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213.66KB
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16頁
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NSC

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LMX2353 PLLatinum Fractional N Single 2.5 GHz Frequency Synthesizer

PRELIMINARY

June 1999

LMX2353

PLLatinum

鈩?/div>

Fractional N Single 2.5 GHz Frequency

Synthesizer

General Description

The LMX2353 is a monolithic integrated fractional N fre-

quency synthesizer, designed to be used in a local oscillator

subsystem for a radio transceiver. It is fabricated using Na-

tional鈥檚 0.5碌 ABiC V silicon BiCMOS process. The LMX2353

contains dual modulus prescalers along with modulo 15 or

16 fractional compensation circuitry in the N divider. A 16/17

or 32/33 prescale ratio can be selected for the LMX2353. Us-

ing a fractional N phase locked loop technique, the LMX2353

can generate very stable low noise control signals for UHF

and VHF voltage controlled oscillators (VCO鈥檚).

The LMX2353 has a highly flexible 16 level programmable

charge pump supplies output current magnitudes from 100

碌A(chǔ) to 1.6 mA. Serial data is transferred into the LMX2353 via

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

range from 2.7V to 5.5V. The LMX2353 features very low

current consumption; typically 4.5 mA at 3.0V. The LMX2353

is available in a 16-pin TSSOP or a 16-pad CSP surface

mount plastic package.

Features

2.7V 鈥?5.5V operation

Low Current Consumption

= 4.5 mA typ

= 3.0V

Programmable or Logical Power Down Mode

= 5 碌A(chǔ) typ

= 3.0V

Modulo 15 or 16 fractional N divider

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

Programmable charge pump current levels

100 碌A(chǔ) to 1.6 mA in 100 碌A(chǔ) steps

Digital Filtered Lock Detect

Applications

Portable wireless communications (PCS/PCN, cordless)

Zero blind slot TDMA systems

Cellular and Cordless telephone systems

Spread spectrum communication systems (CDMA)

Functional Block Diagram

DS101124-1

MICROWIRE

鈩?/div>

and PLLatinum

鈩?/div>

are trademarks of National Semiconductor Corporation.

TRI-STATE

廬

is a registered trademark of National Semiconductor Corporation.

漏 1999 National Semiconductor Corporation

DS101124

www.national.com

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