National LMX1501A LMX1511 Data Sheet
Summary
The LMX1501A/LMX1511 is a high-performance PLL frequency synthesizer designed for robust RF communications up to 1.1 GHz. Featuring ultra low current consumption and integrated dual modulus prescalers, this component is critical for portable wireless applications, including advanced cellular phone systems and cordless communication networks. This technical manual provides comprehensive information on the device's operation, pin descriptions, electrical characteristics (2.7V–5.5V), and functional block diagrams, ensuring precise integration into demanding wireless hardware designs.
Page 1 Text Content
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th iz fo rs ic tio LMX1501A/LMX1511 PLLatinum TM 1.1 GHz Frequency Synthesizer for RF Personal Communications General Description Features
The LMX1501A and the LMX1511 are high performance fre- RF operation up to 1.1 GHz
quency synthesizers with integrated prescalers designed for 2.7V to 5.5V operation RF operation up to 1.1 GHz. They are fabricated using Na- Low current consumption: tional’s ABi C IV Bi CMOS process. ICC m A (typ) at VCC 3V The LMX1501A and the LMX1511 contain dual modulus Dual modulus prescaler: 64/65 or 128/129 prescalers which can select either 64/65 or 128/129 Internal balanced, low leakage charge pump divide ratio at input frequencies of up to 1.1 GHz. Using
Small-outline, plastic, surface mount JEDEC, 0.150×
proprietary digital phase locked loop technique, the
wide, (1501A) or TSSOP, 0.173× wide, (1511) package
LMX1501A/11’s linear phase detector characteristics can generate very stable, low noise local oscillator signals.
Applications
Serial data is transferred into the LMX1501A and the
Cellular telephone systems
LMX1511 via three line MICROWIRETM interface (Data,
(AMPS, NMT, ETACS)
Enable, Clock). Supply voltage can range from 2.7V to 5.5V.
Portable wireless communications
The LMX1501A and the LMX1511 feature very low current
(PCS/PCN, Cordless)
consumption, typically m A at 3V.
Advanced cordless telephone systems
The LMX1501A is available in JEDEC 16-pin surface
(CT-1/CT-1a, CT-2, ISM902-928)
mount plastic package. The LMX1511 is available in
Other wireless communication systems
TSSOP 20-pin surface mount plastic package.
Block Diagram
TL/W/12340–1
TRI-STATEÉ is registered trademark of National Semiconductor Corporation. MICROWIRETM and PLLatinum TM are trademarks of National Semiconductor Corporation.
C1995 National Semiconductor Corporation TL/W/12340 RRD-B30M115/Printed in U. S. A.
Page Summary Contents For National LMX1501A LMX1511 Data Sheet
Manual Details
| Brand | National |
|---|---|
| Pages | 22 |
| File Size | 370.23 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
What is the recommended operating power supply voltage?
The power supply voltage (VCC) should operate between 2.7V and 5.5V.
What frequency range does this synthesizer support?
It provides RF operation up to 1.1 GHz.
How low is the current consumption?
The typical low current consumption is 6 mA at Vcc of 3V.
What are the package options for these ICs?
LMX1501A comes in a JEDEC 16-pin TSSOP, and LMX1511 uses a 20-pin TSSOP.