The CHM1298-99F from United Monolithic Semiconductors is a RF Mixer with RF Frequency 55.00-65.00 GHz, LO Frequency 27.50-32.50 GHz, IF Frequency DC-5.00 GHz, Conversion Loss 12 dB, LO Drive - Power 10 dBm. Tags: Die. More details for CHM1298-99F can be seen below.