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mode
n
Upgrade and compatible to LMX233XA family
General Description
The LMX233XL family of monolithic, integrated dual fre-
quency synthesizers, including prescalers, is to be used as a
local oscillator for RF and first IF of a dual conversion trans-
ceiver. It is fabricated using National鈥檚 0.5碌 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 tech-
nique, combined with a high quality reference oscillator, pro-
vides 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 鈥?5.0 mA at 3V, LMX2331L 鈥?4.0 mA at 3V,
LMX2332L 鈥?3.0 mA at 3V.
The LMX233XL are available in a TSSOP 20-pin and CSP
24-pin surface mount plastic package.
Applications
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Portable Wireless Communications
(PCS/PCN, cordless)
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Cordless and cellular telephone systems
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Wireless Local Area Networks (WLANs)
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Cable TV tuners (CATV)
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Other wireless communication systems
Functional Block Diagram
DS012806-1
TRI-STATE
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are trademarks of National Semiconductor Corporation.
漏 1999 National Semiconductor Corporation
DS012806
www.national.com
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