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Features
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
Description 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.
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
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Also Recommended
| LMX2430 | Significant Reduction In Spurs, Phase Noise, & Power Consumption |
| LMX2531 | Offers Integrated VCO |
| LMX2310U | Up To 2.5GHz Operating Frequency |
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