LMX1600

LMX1600/LMX1601/LMX1602 PLLatinum Low Cost Dual Frequency Synthesizer PRELIMINARY March 1998 LMX1600/LMX1601/LMX1602 PLLatinum™ Low Cost Dual Frequency Synthesizer LMX1600 LMX1601 LMX1602 2.0 GHz/500 MHz 1.1 GHz/500 MHz 1.1 GHz/1.1 GHz Features 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 General Description 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 i...