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).
The LMX2531 is a low‑power, high‑performance frequency synthesizer system that integrates a delta‑sigma PLL, VCO, and tank circuit. It is designed for wireless communication devices and supports a wide range of applications such as 3G/2G cellular base stations, wireless LAN, satellite communications, automotive, and RFID readers.
Key features include multiple frequency options (553 MHz‑2790 MHz), a 1.8 V MICROWIRE interface, low phase‑noise VCO, and a 36‑pin lead‑free leadless lead‑frame package. The document provides functional block diagrams, pin descriptions, electrical characteristics, absolute maximum ratings, and application notes for proper integration.
| Supply voltage range | 2.8 V to 3.2 V |
|---|---|
| Package | 36‑pin 6×6×0.8 mm Lead‑Free Leadless Lead‑frame Package (LLP) |
| Frequency range | 553 MHz – 2790 MHz |
| Power‑down current | 7 pA (CE = 0 V, part initialized) |
The device operates from 2.8 V to 3.2 V.
It is supplied in a 36‑pin 6 × 6 × 0.8 mm lead‑free leadless lead‑frame (LLP) package.
The synthesizer can generate frequencies from 553 MHz up to 2790 MHz.