PLLatinum™ Low Cost Dual Frequency Synthesizer
2.0 GHz/500 MHz
1.1 GHz/500 MHz
1.1 GHz/1.1 GHz
The LMX1600/01/02 is part of a family of monolithic inte-
grated dual frequency synthesizers designed to be used in a
local oscillator subsystem for a radio transceiver. It is fabri-
cated 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 con-
trol voltage for two external loop filters and VCO loops. Digi-
tal 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
The LMX1600/01/02 is available in a 16 pin TSSOP surface
mount plastic package.
n VCC = 2.7V to 3.6V operation
n Low current consumption:
4 mA @ 3V (typ) for LMX1601
5 mA @ 3V (typ) for LMX1600 or LMX1602
n PLL Powerdown mode: ICC = 1 µA typical
n Dual modulus prescaler:
— 2 GHz/500 MHz option: (Main) 32/33 (Aux) 8/9
— 1.1 GHz/500 MHz option: (Main) 16/17 (Aux) 8/9
— 1.1 GHz/1.1 GHz option: (Main) 16/17 (Aux) 16/17
n Digital Filtered Lock Detects
n Cordless / Cellular / PCS phones
n Other digital mobile phones
Functional Block Diagram
TRI-STATE® is a registered trademark of National Semiconductor Corporation.
MICROWIRE™ and PLLatinum™ are trademarks of National Semiconductor Corporation.
© 1998 National Semiconductor Corporation DS100129