LMX2305 National Semiconductor, LMX2305 Datasheet
LMX2305
Manufacturer Part Number
LMX2305
Description
PLLatinumTM 550 MHz Frequency Synthesizer for RF Personal Communications
Manufacturer
National Semiconductor
Datasheet
1.LMX2305.pdf
(14 pages)
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMX2305TMD
Manufacturer:
NS/国半
Quantity:
20 000
C 1996 National Semiconductor Corporation
LMX2305
PLLatinum
for RF Personal Communications
General Description
The LMX2305 is a high performance frequency synthesizer
with an integrated prescaler designed for RF operation up to
550 MHz It is fabricated using National’s ABiC IV BiCMOS
process
The LMX2305 contains a dual modulus prescaler which can
select either a 64 65 or a 128 129 divide ratio at input fre-
quencies of up to 550 MHz LMX2305 which employs the
digital phase lock loop technique combined with a high
quality reference oscillator and a loop filter provides the
tuning voltage for the voltage controlled oscillator to gener-
ate a very stable low noise local oscillator signal
Serial data is transferred into the LMX2305 via a three line
MICROWIRE
age can range from 2 65V to 5 5V The LMX2305 features
very low current consumption typically 4 0 mA at 2 75V
The LMX2305 is available in a TSSOP 20-pin surface mount
plastic package
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRE
TM
and PLLatinum
TM
interface (Data Enable Clock) Supply volt-
TM
are trademarks of National Semiconductor Corporation
TM
550 MHz Frequency Synthesizer
TL W 12459
Features
Y
Y
Y
Y
Y
Y
Applications
Y
Y
Y
Y
Y
RF operation up to 550 MHz
2 65V to 5 5V operation
Low current consumption
I
Dual modulus prescaler 64 65 or 128 129
Internal balanced low leakage charge pump
Small-outline plastic surface mount TSSOP
0 173 wide package
Analog Cellular telephone systems
(AMPS ETACS NMT)
Portable wireless communications
(PCS PCN cordless)
Wireless local area networks (WLANs)
Other wireless communication systems
Pagers
CC
e
RRD-B30M126 Printed in U S A
4 0 mA (typ) at V
CC
e
2 75V
PRELIMINARY
http
www national com
August 1996
TL W 12459 – 1