LMX2314 Datasheet, PDF (1/20 Pages) National Semiconductor (TI) – 1.2 GHz Frequency Synthesizer for RF Personal Communications

March 1995
LMX2314 LMX2315 PLLatinum^TM
1 2 GHz Frequency Synthesizer
for RF Personal Communications
General Description
The LMX2314 and the LMX2315 are high performance fre-
quency synthesizers with integrated prescalers designed for
RF operation up to 1 2 GHz They are fabricated using Na-
tional’s ABiC IV BiCMOS process
The LMX2314 and the LMX2315 contain dual modulus pre-
scalers which can select either a 64 65 or a 128 129 divide
ratio at input frequencies of up to 1 2 GHz Using a proprie-
tary digital phase locked loop technique the LMX2314 15’s
linear phase detector characteristics can generate very sta-
ble low noise local oscillator signals
Serial data is transferred into the LMX2314 and the
LMX2315 via a three line MICROWIRE^TM interface (Data
Enable Clock) Supply voltage can range from 2 7V to 5 5V
The LMX2314 and the LMX2315 feature very low current
consumption typically 6 mA at 3V
The LMX2314 is available in a JEDEC 16-pin surface mount
plastic package The LMX2315 is available in a TSSOP
20-pin surface mount plastic package
Features
Y _{RF operation up to 1 2 GHz}
Y _{2 7V to 5 5V operation}
Y _{Low current consumption}
I_CC e 6 mA (typ) at V_CC e 3V
Y _{Dual modulus prescaler 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 JEDEC 0 150}
wide (2314) or TSSOP 0 173 wide (2315) package
Applications
Y _{Cellular telephone systems}
(GSM IS-54 IS-95 RCR-27)
Y _{Portable wireless communications}
(DECT ISM902-928 CT-2)
Y _{Other wireless communication systems}
Block Diagram
TRI-STATE is a registered trademark of National Semiconductor Corporation
MICROWIRETM and PLLatinumTM are trademarks of National Semiconductor Corporation
C1995 National Semiconductor Corporation TL W 11766
TL W 11766 – 1
RRD-B30M115 Printed in U S A