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LMX2322 Datasheet

  • LMX2322

  • National Semiconductor [PLLatinumTM 2.0 GHz Frequency Synth...

  • 216.36KB

  • NSC

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Advance Information
LMX2322 PLLatinum
TM
2.0 GHz Frequency Synthesizer
for RF Personal Communications
General Description
The LMX2322 is a high performance frequency synthesizer with
integrated 32/33 dual modulus prescaler designed for RF operation
up to 2.0 GHz. Using a proprietary digital phase locked loop
technique, the LMX2322鈥檚 linear phase detector characteristics
can generate very stable, low noise control signals for UHF and
VHF voltage controlled oscillators.
Serial data is transferred into the LMX2322 via a three-line
TM
MICROWIRE interface (Data, LE, Clock). Supply voltage range
is from 2.7 V to 3.9 V. The LMX2322 features very low current
consumption, typically 3.5 mA at 3.75V.
The charge pump
provides 4mA output current.
The LMX2322 is manufactured using National鈥檚 ABiC V BiCMOS
process and is packaged in a 16 pin TSSOP and a 16 pin Chip
Scale Package (CSP).
Features
RF operation up to 2.0 GHz
2.7 V to 3.9 V operation
Low current consumption: Icc = 3.5 mA (typ) at Vcc = 3.75 V
Dual modulus prescaler: 32/33
Internal balanced, low leakage charge pump
Applications
Cellular telephone systems (GSM, NADC, CDMA, PDC, PHS)
Personal wireless communications (DCS-1800, DECT, CT-1+)
Wireless local area networks (WLANs)
Other wireless communication systems
Functional Block Diagram
OSC
10-Bit
R Counter
OSCin
CLOCK
LE
DATA
18-Bit
Microwire
Interface
Phase
Comp
Charge
Pump
CPo
fin
fin
Prescaler
32/33
15-Bit
N Counter
9/24/1998
Rev 1.6
1

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