LMX2315 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Frequency Synthesizer for RF Personal Communications

September 1996
LMX2315 LMX2320 LMX2325 PLLatinum^TM
Frequency Synthesizer
for RF Personal Communications
LMX2325 2 5 GHz
LMX2320 2 0 GHz
LMX2315 1 2 GHz
General Description
The LMX2315 2320 2325’s are high performance frequen-
cy synthesizers with integrated prescalers designed for RF
operation up to 2 5 GHz They are fabricated using Nation-
al’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 propri-
etary digital phase locked loop technique the LMX2315
2320 2325’s linear phase detector characteristics can gen-
erate 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^TM 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 re-
spectively
The LMX2315 LMX2320 and the LMX2325 are available in
a TSSOP 20-pin surface mount plastic package
Features
Y _{RF operation up to 2 5 GHz}
Y _{2 7V to 5 5V operation}
Y _{Low current consumption}
Y _{Dual modulus prescaler}
LMX2325
LMX2320 LMX2315
32 33 or 64 65
64 65 or 128 129
Y _{Internal balanced low leakage charge pump}
Y _{Power down feature for sleep mode}
I_CC e 30 mA (typ) at V_CC e 3V
Y _{Small-outline plastic surface mount TSSOP 0 173}
wide
Applications
Y _{Cellular telephone systems}
(GSM IS-54 IS-95 (RCR-27)
Y _{Portable wireless communications (DECT PHS)}
Y _CATV
Y _{Other wireless communication systems}
Block Diagram
TL W 12339 – 1
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation
C1996 National Semiconductor Corporation TL W 12339
RRD-B30M106 Printed in U S A
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