SBOS709A July 2016 – July 2016 LMH2832
The LMH2832 is designed to be used with a single supply with a range of 4.75 V to 5.25 V. The ideal supply voltage is a 5.0-V total single-ended supply. If the supply is reduced to the minimum voltage, then the maximum input and output voltage range is reduced by 0.25 V.
Ideally, the LMH2832 uses a single-ended, 5-V supply, but the device can be operated on a split supply if necessary. However, the digital logic is referenced to the GND pins, meaning that the logic reference shifts with the GND supply if connected to a negative voltage and must be accounted for in the logic connections. In general, the LMH2832 is not suggested to be operated with a split-supply configuration.
Power-supply decoupling is critical to high-frequency performance. Onboard bypass capacitors are used on the LMH2832EVM; however, the most important component of the supply bypassing is provided by the printed circuit board (PCB). As illustrated in Figure 63, there are multiple vias connecting the LMH2832 power planes to the power-supply traces. These vias connect the internal power planes to the LMH2832. Both VCC and GND must be connected to the internal power planes with several square centimeters of continuous plane in the immediate vicinity of the amplifier. The capacitance between these power planes provides the bulk of the high-frequency bypassing for the LMH2832.