The LMX2594 is a high-performance, wideband PLL with integrated VCOs that can generate
any frequency from 10 MHz to 15 GHz without using an internal doubler, thus eliminating the need
for sub-harmonic filters. The high performance PLL with figure of merit of –236 dBc/Hz and high
phase detector frequency can attain very low in-band noise and integrated jitter. The high speed
N-divider has no pre-divider, thus significantly reducing the amplitude and number of spurs. There
is also a programmable input multiplier to mitigate integer boundary spurs.
The LMX2594 allows users to synchronize the output of multiple devices and also enables
applications that need deterministic delay between input and output. A frequency ramp generator can
synthesize up to 2 segments of ramp in an automatic ramp generation option or a manual option for
maximum flexibility. The fast calibration algorithm allows changing frequencies faster than 20 µs.
The LMX2594 adds support for generating or repeating SYSREF (compliant to JESD204B standard) making
it an ideal low-noise clock source for high-speed data converters. Fine delay adjustment (9 ps
resolution) is provided in this configuration to account for delay differences of board traces.
The output drivers within LMX2594 delivers output power as high as 7 dBm at 15 GHz
carrier frequency. The device runs from a single 3.3 V supply and has integrated LDOs that
eliminate the need for on-board low noise LDOs.
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