ADL5801

Rev. 0 | Page 12 of 20

BIAS CIRCUIT

A band gap reference circuit generates the reference currents

used by mixers. The bias circuit can be enabled and disabled

using the ENBL pin. If the ENBL pin is grounded or left open,

the part is enabled. Pulling the ENBL pin high shuts off the bias

circuit and disables the part. However, the ENBL pin does not

alter the current in the LO section and, therefore, does not

provide a true power-down feature. In addition, if the VSET pin

is connected to the positive supply through a resistor to increase

the mixer core current, this continues to provide bias current to

the mixer core unless the resistor supply is also removed.