LMX1501A Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – PLLatinumTM 1.1 GHz Frequency Synthesizer for RF Personal Communications

November 1995
LMX1501A LMX1511 PLLatinum^TM
1 1 GHz Frequency Synthesizer
for RF Personal Communications
General Description
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
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
Serial data is transferred into the LMX1501A and the
LMX1511 via a three line MICROWIRE^TM 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
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
Features
Y _{RF operation up to 1 1 GHz}
Y _{2 7V to 5 5V operation}
Y _{Low current consumption}
I_CC e 6 mA (typ) at V_CC e 3V
Y _{Dual modulus prescaler 64 65 or 128 129}
Y _{Internal balanced low leakage charge pump}
Y _{Small-outline plastic surface mount JEDEC 0 150}
wide (1501A) or TSSOP 0 173 wide (1511) package
Applications
Y _{Cellular telephone systems}
(AMPS NMT ETACS)
Y _{Portable wireless communications}
(PCS PCN Cordless)
Y _{Advanced cordless telephone systems}
(CT-1 CT-1a CT-2 ISM902-928)
Y _{Other wireless communication systems}
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL W 12340
TL W 12340 – 1
RRD-B30M115 Printed in U S A