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LM2335LTM Datasheet

  • LM2335LTM

  • PLLatinum⑩ Low Power Dual Frequency Synthesizer for RF Pers...

  • 22頁(yè)

  • NSC

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LMX2335L/LMX2336L PLLatinum Low Power Dual Frequency Synthesizer for RF Personal
Communications
PRELIMINARY
June 1999
LMX2335L/LMX2336L
PLLatinum
鈩?/div>
Low Power Dual Frequency Synthesizer for
RF Personal Communications
LMX2335L
LMX2336L
1.1 GHz/1.1 GHz
2.0 GHz/1.1 GHz
Features
n
Ultra low current consumption
n
2.7V to 5.5V operation
n
Selectable synchronous and asynchronous powerdown
mode:
I
CC
= 1 碌A(chǔ) (typ)
n
Dual modulus prescaler: 64/65 or 128/129
n
Selectable charge pump TRI-STATE
廬
mode
n
Selectable charge pump current levels
n
Selectable Fastlock
鈩?/div>
mode
n
Upgrade and compatible to LMX2335/36
n
Small-outline, plastic, surface mount TSSOP package
n
LMX2336 available in CSP package
General Description
The LMX2335L and LMX2336L are monolithic, integrated
dual frequency synthesizers, including two high frequency
prescalers, and are designed for applications requiring two
RF phase-lock loops. They are fabricated using National鈥檚
0.5碌 ABiC V silicon BiCMOS process.
The LMX2335L/36L contains two dual modulus prescalers. A
64/65 or a 128/129 prescaler can be selected for each RF
synthesizer. A second reference divider chain is included in
the IC for improved system noise. The LMX2335L/36L com-
bined with a high quality reference oscillator, two loop filters,
and two external voltage controlled oscillators generates
very stable low noise RF local oscillator signals.
Serial data is transferred into the LMX2335L/36L via a three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.7V to 5.5V. The LMX2335L/36L feature very
low current consumption; LMX2335L 4.0 mA at 5V,
LMX2336L 5.5 mA at 5V. The LMX2335L is available in SO,
TSSOP and CSP 16-pin surface mount plastic packages.
The LMX2336L is available in a TSSOP 20-pin and CSP
24-pin surface mount plastic package.
Applications
n
Cellular telephone systems (AMPS, ETACS, RCR-27)
n
Cordless telephone systems
(DECT, ISM , PHS, CT-1+)
n
Personal Communication Systems
(DCS-1800, PCN-1900)
n
Dual Mode PCS phones
n
Cable TV Tuners (CATV)
n
Other wireless communication systems
Functional Block Diagram
DS012807-1
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
Fastlock
鈩?/div>
, MICROWIRE
鈩?/div>
and PLLatinum
鈩?/div>
are trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012807
www.national.com

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