Low Power PLLs

National Semiconductor has announced the LMX23xxU series of ultra low power dual phase locked loop frequency synthesisers, the latest addition to National's family of PLLatinum PLLs for wireless applications.

This family is pin- and software-compatible with the current LMX23xxL family of PLLs, providing easy upgrade, and consumes up to 43% less power.

Lower power consumption creates a higher level of performance for mobile phones - including longer handset talk and standby time, as well as longer battery life, and lower handset weight and size.

The LMX23xxU family of six dual PLLs offers all the features of National's PLLatinum product line, including ultra low current consumption, low phase noise and Fastlock mode, plus a 3 to 6 dB improvement in spurial performance.

Using a digital phase locked loop technique combined with a high quality reference oscillator and voltage controlled oscillator, the family generates very stable, low noise local oscillator signals for up and down conversion in wireless communication devices.

LMX2330U, LMX2331U, LMX2332U, LMX2336U and LMX2377U products are designed to be used as local oscillators for RF and first IF of a dual conversion transceiver.

LMX2377U offers the additional feature of a 1.8 V data interface, making it compatible with low voltage processor I/O and control logic.

LMX2335U is designed for applications requiring two independent transmit and receive PLLs.