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LMX2335 Datasheet(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LMX2335
Description  PLLatinum??Dual Frequency Synthesizer for RF Personal Communications
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMX2335 Datasheet(HTML) 1 Page - National Semiconductor (TI)

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LMX2335/LMX2336/LMX2337
PLLatinumDual Frequency Synthesizer for RF
Personal Communications
LMX2335
1.1 GHz/1.1 GHz
LMX2336
2.0 GHz/1.1 GHz
LMX2337
550 MHz/550 MHz
General Description
The LMX2335, LMX2336 and LMX2337 are monolithic, inte-
grated dual frequency synthesizers, including two high fre-
quency prescalers, and are designed for applications requir-
ing two RF phase-lock loops. They are fabricated using
National’s ABiC IV silicon BiCMOS process.
The LMX2335/36/37 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. LMX2335/36/37, which
employ a digital phase locked loop technique, combined with
a high quality reference oscillator and loop filters, provide the
tuning voltages for voltage controlled oscillators to generate
very stable low noise RF local oscillator signals.
Serial data is transferred into the LMX2335/36/37 via a three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.7V to 5.5V. The LMX2335/36/37 feature very
low current consumption; LMX2335/37 −10 mA at 3V,
LMX2336 −13 mA at 3V. The LMX2335/37 are available in
both a JEDEC SO and TSSOP 16-pin surface mount plastic
package. The LMX2336 is available in a TSSOP 20-pin sur-
face mount plastic package.
Features
n 2.7V to 5.5V operation
n Low current consumption
n Selectable powerdown mode:
I
CC = 1 µA (typ)
n Dual modulus prescaler: 64/65 or 128/129
n Selectable charge pump TRI-STATE® mode
n Selectable charge pump current levels
n Selectable FastLockmode
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 CATV
n Other wireless communication systems
Functional Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
Fastlock, MICROWIREand PLLatinumare trademarks of National Semiconductor Corporation.
DS012332-1
September 1996
© 1999 National Semiconductor Corporation
DS012332
www.national.com


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