XM-A6E8-0804C-01
XR-A6E8-0804C-01 ROHS

Power-up Sequence
1. Apply -VIN = -6V [-6V to -10V]
2. Apply +VIN = +7V [7V to 12V]
3. Optional: VCTL-IN
(-4.5V = Max Gain, 0V = Min Gain)
Note: VCTRL is set to max gain (-4.5V) through a 10k Ohm pull-down resistor if left open.
4. Apply the RF input signal



Power-down Sequence
1. Turn off the RF input signal
2. Adjust VCTL-IN to 0V
3. Adjust +VIN to 0V
4. Adjust -VIN to 0V

Theory of Operation
The positive input voltage is regulated to provide VDD = +5V to the RF amplifier. The negative input voltage is regulated to -4.5V for VCTL from which the -2V gate voltage is derived. The -2V VG is actively controlled by the HMC981 to become less negative until an IDD of 120mA is achieved. IDD is actively maintained by continuously adjusting VG during operation.