9 Power Supply Recommendations

The LMH32401 device operates on 3.3-V supplies. The VDD1 and VDD2 pins must always be driven from the same supply source and individually bypassed. A low power-supply source impedance must be maintained across frequency. So use multiple bypass capacitors in parallel. Place the bypass capacitors as close to the supply pins as possible. Place the smallest capacitor on the same side of the PCB as the LMH32401 device. Placing the larger valued bypass capacitors on the same side of the PCB is preferable as well. However, if there are space constraints, then the capacitors can be moved to the opposite side of the PCB using multiple vias to reduce the series inductance resulting from the vias. The LMH32401 device can operate on bipolar supplies by connecting pins 1 and 7 to the negative supply. The thermal pad must always be connected to the most negative supply. The digital pin threshold voltages must be appropriately level shifted as they are connected to voltages at pins 1 and 7.