National Semiconductor LMX2531 Manuals

The LMX2531 is a low power, high performance frequency synthesizer system that includes a fully integrated delta-sigma PLL and VCO with a fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision LDOs for the PLL and VCO which give higher supply noise immunity and more consistent performance. When combined with a high quality reference oscillator, the LMX2531 generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices. The LMX2531 is a monolithic integrated circuit, fabricated in an advanced BiCMOS process. There are actually several different versions of this product, for which the primary difference is frequency range. Device programming is facilitated using a three-wire MICROWIRE Interface that can operate down to 1.8 volts. Supply voltage range is 2.8 to 3.2 Volts. The LMX2531 is available in a 36 pin 6x6x0.8 mm Lead-Free Leadless Lead-frame Package (LLP). Target Applications n 3G Cellular Base Stations (WCDMA, TD-SCDMA,CDMA2000) n 2G Cellular Base Stations (GSM/GPRS, EDGE, CDMA1xRTT) n Wireless LAN n Broadband Wireless Access n Satellite Communications n Wireless Radio n Automotive n CATV Equipment n Instrumentation and Test Equipment n RFID Readers Features Multiple Frequency Options Available

The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated delta- sigma PLL and VCO with fully integrated tank circuit. The third and fourth poles are also integrated and also adjustable. Also included are integrated ultra-low noise and high precision LDOs for the PLL and VCO which give higher supply noise immunity and also more consistent performance. When com- bined with a high quality reference oscillator, the LMX2531 generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices. The LMX2531 is a monolithic integrated circuit, fabricated in an advanced BiCMOS process. There are several different versions of this product in order to accomodate different fre- quency bands. Device programming is facilitated using a three-wire MICROWIRE Interface that can operate down to 1.8 volts. Supply voltage range is 2.8 to 3.2 Volts. The LMX2531 is available in a 36 pin 6x6x0.8 mm Lead-Free Leadless Lead-frame Package (LLP).