https://www.omo-ic.cn/blog/2012-10/max2870-frequency-synthesizer-9776.html
MAX2870 Frequency Synthesizer | OMO Electronic
Maxim's MAX2870 ultra-wideband PLL with integrated VCOs is controlled by a 3-wire serial interface and is compatible with 1.8 V control logic.
frequency synthesizeromoelectronic