SNOSB30P October 2008 – January 2015 LMH6554
The LMH6554 can be used with any combination of positive and negative power supplies as long as the combined supply voltage is between 4.7 V and 5.25 V. The LMH6554 will provide best performance when the output voltage is set at the mid supply voltage, and when the total supply voltage is set to 5 V.
Power supply bypassing as shown in Power Supply Bypassing is important and power supply regulation should be within 5% or better.
The LMH6554 requires supply bypassing capacitors as shown in Figure 36 and Figure 37. The 0.01-μF and 0.1-μF capacitors should be leadless SMT ceramic capacitors and should be no more than 3 mm from the supply pins. These capacitors should be star routed with a dedicated ground return plane or trace for best harmonic distortion performance. Thin traces or small vias will reduce the effectiveness of bypass capacitors. Also shown in both figures is a capacitor from the VCM and VEN 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.