The LMX2531 is a low power, high performance frequency synthesizer system which includes a fully integrated deltasigma 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 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. 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.
Fractional-N Delta Sigma Modulator Order programmable up to 4th order
FastLock/Cycle Slip Reduction with Timeout Counter
Partially integrated, adjustable Loop Filter
Very low phase noise and spurs2.8 V to 3.2 V Operation
Low Power-Down Current
1.8V MICROWIRE Support
Broadband Wireless Access
Instrumentation and Test Equipment
36 Pin LLP Package. Manufactured by National.