OBSOLETE
July 11, 2011
PLLatinum™ Low Power Dual Frequency Synthesizer for
RF Personal Communications
LMX2330L 2.5 GHz/510 MHz
LMX2331L 2.0 GHz/510 MHz
LMX2332L 1.2 GHz/510 MHz
General Description
Features
The LMX233XL family of monolithic, integrated dual frequency synthesizers, including prescalers, is to be used as a local
oscillator for RF and first IF of a dual conversion transceiver.
It is fabricated using National's 0.5μ ABiC V silicon BiCMOS
process.
The LMX233XL contains dual modulus prescalers. A 64/65
or a 128/129 prescaler (32/33 or 64/65 in the 2.5 GHz
LMX2330L) can be selected for the RF synthesizer and a 8/9
or a 16/17 prescaler can be selected for the IF synthesizer.
LMX233XL, which employs a digital phase locked loop technique, combined with a high quality reference oscillator, provides the tuning voltages for voltage controlled oscillators to
generate very stable, low noise signals for RF and IF local
oscillators. Serial data is transferred into the LMX233XL via
a three wire interface (Data, Enable, Clock). Supply voltage
can range from 2.7V to 5.5V. The LMX233XL family features
very low current consumption;
LMX2330L—5.0 mA at 3V, LMX2331L—4.0 mA at 3V,
LMX2332L—3.0 mA at 3V.
The LMX233XL are available in a TSSOP 20-pin, CSP 24-pin
surface mount plastic package, and thin CSP 20-pin surface
mount plastic package.
■ Ultra low current consumption
■ 2.7V to 5.5V operation
■ Selectable synchronous or asynchronous powerdown
■
■
■
■
■
mode:
ICC = 1 μA typical at 3V
Dual modulus prescaler:
LMX2330L
(RF) 32/33 or 64/65
LMX2331L/32L
(RF) 64/65 or 128/129
LMX2330L/31L/32L (IF) 8/9 or 16/17
Selectable charge pump TRI-STATE® mode
Selectable charge pump current levels
Selectable Fastlock™ mode
Upgrade and compatible to LMX233XA family
Applications
■ Portable Wireless Communications
■
■
■
■
(PCS/PCN, cordless)
Cordless and cellular telephone systems
Wireless Local Area Networks (WLANs)
Cable TV tuners (CATV)
Other wireless communication systems
PLLatinum™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
MICROWIRE™ is a trademark of National Semiconductor Corporation.
© 2011 National Semiconductor Corporation
12806
12806 Version 9 Revision 2
www.national.com
Print Date/Time: 2011/07/11 15:54:42
LMX2330L/LMX2331L/LMX2332L PLLatinum Low Power Dual Frequency Synthesizer for RF
Personal Communications
LMX2330L/LMX2331L/
LMX2332L
