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LMX2353TMX Datasheet

  • LMX2353TMX

  • PLLatinum⑩ Fractional N Single 2.5 GHz Frequency Synthesize...

  • 16頁

  • 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 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
n
2.7V 鈥?5.5V operation
n
Low Current Consumption
I
CC
= 4.5 mA typ
@
V
CC
= 3.0V
n
Programmable or Logical Power Down Mode
I
CC
= 5 碌A typ
@
V
CC
= 3.0V
n
Modulo 15 or 16 fractional N divider
Supports ratios of 1, 2, 3, 4, 5, 8, 15, or 16
n
Programmable charge pump current levels
100 碌A to 1.6 mA in 100 碌A steps
n
Digital Filtered Lock Detect
Applications
n
n
n
n
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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