Hi TI expert
The LMX2311U is listed as an obsolete part. Do you have a replacement part?
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Most of our RF portfolio uses a dual RF/IF PLL architecture, but if you use only one of the PLLs in the device, something like LMX2470 should be very similar to LMX2311U with similar power performance. If the power consumption can be increased (~60mA), the LMX2491 offers much better performance.
Most of TI's devices have moved toward high performance and integrated VCOs. However, a search on the RF synthesizer portfolio page on TI.com () sorted by lowest power will locate any devices that still resemble the architecture used by the LMX2311U, in case one of the other devices above is insufficient.