LMX5080 Datasheet | National Semiconductor

Description The LMX5080 integrated dual modulus prescaler, is designed to be used in a synthesized local oscillator for 2.5 GHz wireless transceivers. It is fabricated using National’s 0.5µ ABi CV silicon Bi CMOS process. The LMX5080 contains three dual modulus prescalers. Either a 128/130, 256/158 or a 512/514 prescaler can be selected for up to 2.7 Gz RF input frequencies. The prescaler inputs can be driven either differentially, or single ended with the use of a coupling capacitor on one of the inputs to ground. The LMX5080 CMOS output is optimized to generate very stable, low switching noise output signals. The LMX5080 prescaler can be used in conjunction with a low frequency Phase Lock Loop to form a frequency synthesizer suitable for UHF transceivers. Supply voltage can range from 2.7V to 5.5V. The LMX5080 features low current consumption; typically 7.0 m A at 5V VCC The LMX5080 is available in a 8-pin Small Outline (SOP) surface mount plastic package. Features 2.7V to 5.5V operation Low current consumption: 7 m A (typ) @ 5V - 40˚C to +85˚C low noise CMOS output Selectable dual modulus prescaler 128/130 256/258 512/514 n 8-pin small package outline (SOP) n n n n Applications n 2.5 GHz wireless munications systems (ISM) n Direct Broadcast Satellite systems (DBS) n Cable TV tuners (CATV) Functional Block Diagram DS100940-1 PLLatinum™ is a trademark of National Semiconductor Corporation. © 1999 National Semiconductor Corporation DS100940 .national. Connection Diagram Small Outline Package (SOP) DS100940-2 NS Package Number M08A Order Number LMX5080M, LMX5080MX Pin Descriptions Pin No. 1 2 Pin Name IN VCC I/O I - Description RF small signal prescaler input. Small signal input from the voltage controlled oscillator Power Supply voltage input may range from 2.7V to 5.5V. Bypass capacitors should be placed as close as possible to this pin and be connected directly to the ground plane. Divide Ratio Control. CMOS logic input. Pin functionality is described in...