National LMX2305 Data Sheet/Manual
Summary
This high-performance, low-power frequency synthesizer generates stable local oscillator signals up to 550 MHz using advanced BiCMOS technology. Perfect for critical RF communications, this component drives various portable wireless systems including cellular networks, WLANs, and pagers. The associated documentation provides comprehensive technical details, pin descriptions, operating parameters (2.65V–5.5V), and application guides necessary for system integration by electronics engineers.
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PRELIMINARY August
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fo rs ic tio LMX2305 PLLatinum TM MHz Frequency Synthesizer for RF Personal Communications General Description Features
The LMX2305 is high performance frequency synthesizer RF operation up to MHz
with an integrated prescaler designed for RF operation up to 2.65V to 5.5V operation MHz. It is fabricated using National’s ABi C IV Bi CMOS Low current consumption: process. ICC 4.0 m A (typ) at VCC 2.75V The LMX2305 contains dual modulus prescaler which can Dual modulus prescaler: 64/65 or 128/129 select either 64/65 or 128/129 divide ratio at input fre- Internal balanced, low leakage charge pump quencies of up to MHz. LMX2305, which employs the
Small-outline, plastic, surface mount TSSOP,
digital phase lock loop technique, combined with high
0.173× wide package
quality reference oscillator and loop filter, provides the tuning voltage for the voltage controlled oscillator to gener-
Applications
ate very stable, low noise local oscillator signal.
Analog Cellular telephone systems
Serial data is transferred into the LMX2305 via three line
(AMPS, ETACS, NMT)
MICROWIRETM interface (Data, Enable, Clock). Supply volt-
Portable wireless communications
age can range from 2.65V to 5.5V. The LMX2305 features
(PCS/PCN, cordless)
very low current consumption, typically 4.0 m A at 2.75V.
Wireless local area networks (WLANs)
The LMX2305 is available in TSSOP 20-pin surface mount
Other wireless communication systems
plastic package.
Pagers
Block Diagram
TL/W/12459–1
TRI-STATEÉ is registered trademark of National Semiconductor Corporation. MICROWIRETM and PLLatinum TM are trademarks of National Semiconductor Corporation.
C1996 National Semiconductor Corporation TL/W/12459 RRD-B30M126/Printed in U. S. A. http://www.national.com
Page Summary Contents For National LMX2305 Data Sheet/Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 14 |
| File Size | 229.56 KB |
| Published | May 29, 2026 |
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Frequently Asked Questions
What is the recommended power supply voltage range?
The recommended operating voltage range is 2.65V to 5.5V.
How low is the current consumption of this synthesizer?
It has a very low quiescent current consumption, typically 4.0 mA at 2.75V.
What types of systems can use the LMX2305?
Applications include cellular telephone systems (AMPS, ETACS, NMT), WLANs, and pagers.
Does the device have a power-saving mode?
Yes, power down is initiated when pin PWDN is brought low. The function is gated by the charge pump reaching a TRI-STATE condition.
Which division ratios are selectable on the dual modulus prescaler?
The synthesizer can select either a 64/65 or a 128/129 divide ratio.