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LM2326SLBX Datasheet

  • LM2326SLBX

  • PLLatinum⑩ Low Power Frequency Synthesizer for RF Personal ...

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  • 19頁(yè)

  • NSC

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LMX2306/LMX2316/LMX2326 PLLatinum Low Power Frequency Synthesizer for RF Personal
Communications
April 2000
LMX2306/LMX2316/LMX2326
PLLatinum
鈩?/div>
Low Power Frequency Synthesizer for RF
Personal Communications
LMX2306
550 MHz
LMX2316
1.2 GHz
LMX2326
2.8 GHz
General Description
The LMX2306/16/26 are monolithic, integrated frequency
synthesizers with prescalers that are designed to be used to
generate a very stable low noise signal for controlling the lo-
cal oscillator of an RF transceiver. They are fabricated using
National鈥檚 ABiC V silicon BiCMOS 0.5碌 process.
The LMX2306 contains a 8/9 dual modulus prescaler while
the LMX2316 and the LMX2326 have a 32/33 dual modulus
prescaler. The LMX2306/16/26 employ a digital phase
locked loop technique. When combined with a high quality
reference oscillator and loop filter, the LMX2306/16/26 pro-
vide the feedback tuning voltage for a voltage controlled os-
cillator to generate a low phase noise local oscillator signal.
Serial data is transferred into the LMX2306/16/26 via a three
wire interface (Data, Enable, Clock). Supply voltage can
range from 2.3V to 5.5V. The LMX2306/16/26 feature ultra
low current consumption; LMX2306 - 1.7 mA at 3V,
LMX2316 - 2.5 mA at 3V, and LMX2326 - 4.0 mA at 3V.
The LMX2306/16/26 synthesizers are available in a 16-pin
TSSOP surface mount plastic package.
Features
n
n
n
n
n
2.3V to 5.5V operation
Ultra low current consumption
2.5V V
CC
JEDEC standard compatible
Programmable or logical power down mode:
鈥?I
CC
= 1 碌A(chǔ) typical at 3V
Dual modulus prescaler:
鈥?LMX2306
8/9
鈥?LMX2316/26
32/33
Selectable charge pump TRI-STATE
廬
mode
Selectable FastLock
鈩?/div>
mode with timeout counter
MICROWIRE
鈩?/div>
Interface
Digital Lock Detect
n
n
n
n
Applications
n
n
n
n
n
Portable wireless communications (PCS/PCN, cordless)
Wireless Local Area Networks (WLANs)
Cable TV tuners (CATV)
Pagers
Other wireless communication systems
Functional Block Diagram
DS100127-1
TRI-STATE
廬
is a registered trademark of National Semiconductor Corporation.
FastLock
鈩?/div>
, PLLatinum
鈩?/div>
and MICROWIRE
鈩?/div>
are trademarks of National Semiconductor Corporation.
漏 2000 National Semiconductor Corporation
DS100127
www.national.com

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