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Features
RF operation up to 2.5 GHz
2.7V to 5.5V operation
Low current consumption
Dual modulus prescaler:
LMX2325: 32/33 or 64/65
LMX2320/LMX2315: 64/65 or 128/129
Internal balanced, low leakage charge pump
Power down feature for sleep mode: ICC = 30 μA (typ) at VCC = 3V
Small-outline, plastic, surface mount TSSOP, 0.173″ wide
Description The LMX2315/2320/2325's are high performance frequency synthesizers with integrated prescalers designed for RF operation up
to 2.5 GHz. They are fabricated using National's ABiC IV BiCMOS process.
A 64/65 or a 128/129 divide ratio can be selected for the LMX2315 and LMX2320 RF synthesizer at input frequencies of up to
1.2 GHz and 2.0 GHz, while 32/33 and 64/65 divide ratios are available in the 2.5 GHz LMX2325. Using a proprietary digital
phase locked loop technique, the LMX2315/2320/2325's linear phase detector characteristics can generate very stable, low noise
signals for controlling a local oscillator.
Serial data is transferred into the LMX2320 and the LMX2325 via a three line MICROWIRE interface (Data, Enable, Clock). Supply voltage can range from 2.7V to 5.5V. The LMX2315, LMX2320 and the LMX2325 feature
very low current consumption, typically 6 mA, 10 mA and 11 mA respectively.
The LMX2315, LMX2320 and the LMX2325 are available in a TSSOP 20-pin surface mount plastic package.
Applications
Cellular telephone systems
(GSM, IS-54, IS-95, (RCR-27)
Portable wireless communications (DECT, PHS)
CATV
Other wireless communication systems
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