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Dual Phase Locked Loop Frequency Synthesizers

Wed, 05/30/2001 - 11:55am
National Semiconductor announced the LMX23xxU series of ultra-low power dual phase locked loop (PLL) frequency synthesizers, the latest addition to National's industry-leading family of PLLatinum( PLLs for wireless applications. This new family is pin- and software-compatible with the current LMX23xxL family of PLLs, providing easy upgrade, and consumes up to 43 percent less power. Lower power consumption creates a higher level of performance for cell 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 LMX23xxU 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 1.8V 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.

The entire LMX23xxU family except for the LMX2335U is available in CSP24 and TSSOP20 packages. The LMX2335U is available in CSP16 and TSSOP16 packages.

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