OBSOLETE
October 4, 2010
PLLatinum™ Low Cost Dual Frequency Synthesizer
General Description
Features
The LMX1600/01/02 is part of a family of monolithic integrated
dual frequency synthesizers designed to be used in a local
oscillator subsystem for a radio transceiver. It is fabricated
using National's 0.5u ABiC V silicon BiCMOS process.
The LMX1600/01/02 contains two dual modulus prescalers,
four programmable counters, two phase detectors and two
selectable gain charge pumps necessary to provide the control voltage for two external loop filters and VCO loops. Digital
filtered lock detects for both PLLs are included. Data is transferred into the LMX1600/01/02 via a MICROWIRE™ serial
interface (Data, Clock, LE).
VCC supply voltage can range from 2.7V to 3.6V. The
LMX1600/01/02 features very low current consumption - typically 4.0 mA at 3V for LMX1601, 5.0 mA at 3V for LMX1600
or LMX1602. Powerdown for the PLL is hardware controlled.
The LMX1600/01/02 is available in a 16 pin TSSOP surface
mount plastic package.
■ VCC = 2.7V to 3.6V operation
■ Low current consumption:
4 mA @ 3V (typ) for LMX1601
5 mA @ 3V (typ) for LMX1600 or LMX1602
■ PLL Powerdown mode: ICC = 1 µA typical
■ Digital Filtered Lock Detects
■ Dual modulus prescaler:
(Main) 32/33 (Aux) 8/9
— 2 GHz/500 MHz option:
(Main) 16/17 (Aux) 8/9
— 1.1 GHz/500 MHz option:
(Main) 16/17 (Aux) 16/17
— 1.1 GHz/1.1 GHz option:
Applications
■ Cordless / Cellular / PCS phones
■ Other digital mobile phones
Functional Block Diagram
10012901
PLLatinum™ is a trademark of National Semiconductor Corporation.
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
© 2010 National Semiconductor Corporation
100129
100129 Version 7 Revision 4
www.national.com
Print Date/Time: 2010/10/04 12:19:53
LMX1600/LMX1601/LMX1602 PLLatinum Low Cost Dual Frequency Synthesizer
LMX1600 2.0 GHz/500 MHz
LMX1601 1.1 GHz/500 MHz
LMX1602 1.1 GHz/1.1 GHz
