HMC857 required GND and -3.3V to operate and there is not an alternative part working with positive voltages.
However shifting supplies by 3.3V is possible, allowing the part operating between +3.3V and GND. To do that, every pin voltage should be shifted by 3.3V.
- All GND pins and the exposed paddle should be connected to +3.3V
- Optional capacitors to GND pins adjacent to high speed I/Os(pin 1,4,5,8,17,29,21,24) improves signal integrity/return loss.
- These capacitors should be 0201 package and ~100pF decoupling to PCB's RF ground.
- Vee pins should be connected to GND
- VR voltage should be shifted by 3.3V
- SEL+ and SELx voltages should be shifted by 3.3V
- High speed I/Os (pin 2,3,6,7,18,19,22,23) needs to see a line voltage of +3.3V. Alternatively DC block capacitor could be used.
HMC857 required GND and -3.3V to operate and there is not an alternative part working with positive voltages.
However shifting supplies by 3.3V is possible, allowing the part operating between +3.3V and GND. To do that, every pin voltage should be shifted by 3.3V.
- All GND pins and the exposed paddle should be connected to +3.3V
- Optional capacitors to GND pins adjacent to high speed I/Os(pin 1,4,5,8,17,29,21,24) improves signal integrity/return loss.
- These capacitors should be 0201 package and ~100pF decoupling to PCB's RF ground.
- Vee pins should be connected to GND
- VR voltage should be shifted by 3.3V
- SEL+ and SELx voltages should be shifted by 3.3V
- High speed I/Os (pin 2,3,6,7,18,19,22,23) needs to see a line voltage of +3.3V. Alternatively DC block capacitor could be used.
