The LMH6552 can be used with any combination of positive and negative power supplies as long as the combined supply voltage is between 4.5 V and 12 V. The LMH6552 provides best performance when the output voltage is set at the mid supply voltage, and when the total supply voltage is between 9 V and 12 V. When selecting a supply voltage that is less than 9 V, it is important to consider both the input common mode voltage range as well as the output voltage range.

Power supply bypassing as shown in Power Supply Bypassing is important and power supply regulation must be within 5% or better using a supply voltage near the edges of the operating range.

9.1 Power Supply Bypassing

The LMH6552 requires supply bypassing capacitors as illustrated in Figure 53 and Figure 54. The 0.01-µF and 0.1-µF capacitors must be leadless SMT ceramic capacitors and must be no more than 3 mm from the supply pins. These capacitors must be star routed with a dedicated ground return plane or trace for best harmonic distortion performance. A small capacitor, ~0.01 µF, placed across the supply rails, and as close to the chip's supply pins as possible, can further improve HD2 performance. Thin traces or small vias reduce the effectiveness of bypass capacitors. Also shown in both figures is a capacitor from the V_CM and ENABLE pins to ground. These inputs are high impedance and can provide a coupling path into the amplifier for external noise sources, possibly resulting in loss of dynamic range, degraded CMRR, degraded balance and higher distortion.

Figure 53. Split Supply Bypassing Capacitors

Figure 54. Single Supply Bypassing Capacitors