PLLs Draw Little Power November 2001 Issue Published Date: November 01, 2001
Claiming the lowest current consumption in the market, the LMX23xxU family of dual phase locked loops (PLLs) is pin and software compatible with the LMX23L devices but with a power consumption that is 43%. Comprised of six devices, the dual PLL family also offers a 3 dB to 6 dB improvement in spurial performance compared to the predecessor PLLs and uses a digital PLL technique combined with an accurate reference oscillator and voltage-controlled oscillator. The LMX2330/2331/2332/2336/2377U devices are designed for use as local oscillators for RF and first IF in dual-conversion transceivers, with the LMX2377U including a 1.8V data interface for compatibility with low-voltage processor I/O and control logic. The sixth device, the LMX2335U, is designed for applications requiring two independent transmit and receive PLLs. Prices start at $1.77 each/1,000. NATIONAL SEMICONDUCTOR CORP., Santa Clara, CA. (800) 272-9959.
