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LMX2371 Datasheet

  • LMX2371

  • 24頁

  • ETC

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LMX2370/LMX2371/LMX2372 PLLatinum Dual Frequency Synthesizer for RF Personal
Communications
July 2000
LMX2370/LMX2371/LMX2372
PLLatinum
鈩?/div>
Dual Frequency Synthesizer for RF
Personal Communications
LMX2370 2.5 GHz/1.2 GHz
LMX2371 2.0 GHz/1.2 GHz
LMX2372 1.2 GHz/1.2 GHz
The LMX237x are available in a 24-pad chip scale (CSP) or
a 20-pin TSSOP surface mount plastic package.
Features
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2.7V鈥?.5V operation
Ultra low current consumption
Low phase detector noise floor
Low voltage MICROWIRE
鈩?/div>
interface (1.8V up to V
CC
)
Low prescaler values
32/33 at f
IN
鈮?/div>
2.5 GHz
16/17 at f
IN
鈮?/div>
1.2 GHz
8/9 at f
IN
鈮?/div>
550 MHz
Selectable charge pump current levels
Selectable FastLock
鈩?/div>
mode
Enhanced ESD protection
Available in small 24-pad chip scale package (3.5 x 4.5
x 1.0 mm)
General Description
The LMX237x family of monolithic, integrated dual frequency
synthesizers, including prescalers, is designed to be used as
a first and second local oscillator for dual mode or dual con-
version transceivers. It is fabricated using National鈥檚 0.5u
ABiCV silicon BiCMOS process. The LMX237x contains two
dual modulus prescalers. A 32/33 or a 16/17 prescaler can
be selected for the 2.5 GHz and 2.0 GHz RF synthesizers
with the 16/17 prescaler rated for input frequencies below
1.2 GHz. A 16/17 or an 8/9 prescaler can be selected for the
1.2 GHz RF synthesizers with the 8/9 prescaler rated for in-
put frequencies below 550 MHz. Using a digital phase
locked loop technique, the LMX237x can generate very
stable, low noise control signals for UHF and VHF voltage
controlled oscillators (VCOs). Serial data is transferred into
the LMX237x via a 1.8 V three wire interface (Data, Enable,
Clock) compatible with low voltage baseband processors.
Supply voltage can range from 2.7V to 5.5V. The LMX237x
family features very low current consumption typically:
LMX2370 - 6.0 mA at 3V, LMX2371 - 5.0 mA at 3V, LMX2372
- 4.0 mA at 3V.
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Applications
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Portable wireless communications (PCS/PCN, cordless)
Dual mode cellular telephone systems
Spread spectrum communication systems (CDMA)
Cable TV tuners (CATV)
Functional Block Diagram
DS101026-4
FastLock
鈩?/div>
, PLLatinum
鈩?/div>
and MICROWIRE
鈩?/div>
are trademarks of National Semiconductor Corporation.
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
漏 2000 National Semiconductor Corporation
DS101026
www.national.com

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