November 1995
LMX1501A/LMX1511 PLLatinumTM
1.1 GHz Frequency Synthesizer
for RF Personal Communications
General Description
Features
Y
Y
Y
RF operation up to 1.1 GHz
The LMX1501A and the LMX1511 are high performance fre-
quency synthesizers with integrated prescalers designed for
RF operation up to 1.1 GHz. They are fabricated using Na-
tional’s ABiC IV BiCMOS process.
2.7V to 5.5V operation
Low current consumption:
e
Dual modulus prescaler: 64/65 or 128/129
e
3V
I
6 mA (typ) at V
CC
CC
Y
Y
Y
The LMX1501A and the LMX1511 contain dual modulus
prescalers which can select either a 64/65 or a 128/129
divide ratio at input frequencies of up to 1.1 GHz. Using a
proprietary digital phase locked loop technique, the
LMX1501A/11’s linear phase detector characteristics can
generate very stable, low noise local oscillator signals.
Internal balanced, low leakage charge pump
Small-outline, plastic, surface mount JEDEC, 0.150
×
wide, (1501A) or TSSOP, 0.173 wide, (1511) package
×
Applications
Y
Serial data is transferred into the LMX1501A and the
LMX1511 via a three line MICROWIRETM interface (Data,
Enable, Clock). Supply voltage can range from 2.7V to 5.5V.
The LMX1501A and the LMX1511 feature very low current
consumption, typically 6 mA at 3V.
Cellular telephone systems
(AMPS, NMT, ETACS)
Y
Portable wireless communications
(PCS/PCN, Cordless)
Y
Advanced cordless telephone systems
The LMX1501A is available in a JEDEC 16-pin surface
mount plastic package. The LMX1511 is available in a
TSSOP 20-pin surface mount plastic package.
a
(CT-1/CT-1 , CT-2, ISM902-928)
Other wireless communication systems
Y
Block Diagram
TL/W/12340–1
TRI-STATEÉ is a registered trademark of National Semiconductor Corporation.
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation.
C
1995 National Semiconductor Corporation
TL/W/12340
RRD-B30M115/Printed in U. S. A.