Brief Description
This product comprises a selection of independent functional blocks vital to modern microcomputer controlled radio-frequency communications equipment. Examples of possible uses are as follows:

• The four-way multiplexed ADC with magnitude comparator may be used for monitoring RSSI, battery voltage, temperatures, reflected signals or error voltages.
• The three DACs may be used to adjust VCOs, reference oscillators, power output, bias current or IF gain.
• The two variable attenuators may be used to adjust deviation, modulation depth or baseband gain.

The FX839 is controlled via the standard serial C-BUS. This is complementary to, and compatible with, many standard microcomputers and other baseband processing blocks.

FEATUREs
• Three DACs 8 or 10-Bit Resolution
• Custom IRQ Generator with Variable 8-Bit Reference Settings
• Two Variable Attenuators
• Low Power (3.0V Operation)
• Multiplexed 4 Input ADC 10-Bit Resolution
• Scalable ADC Clock Frequencies from Xtal/Clock
• Serial Interface to Host µC
• 24-Pin SSOP Package