VCM

V

+

10 2F

0.1 2F

+

-

0.1 2F

0.01 2F

0.01 2F

VEN

-OUT

+OUT

+IN

-IN

LMH6554

VCM

V

+

0.01 2F

0.1 2F

0.1 2F

+

-

LMH6554

10 2F

0.01 2F

0.1 2F

V

-

10 2F

+OUT

-OUT

+IN

-IN

0.1 2F

VEN

LMH6554

SNOSB30P – OCTOBER 2008 – REVISED JANUARY 2015

www.ti.com

10 Power Supply Recommendations

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.

10.1 Power Supply Bypassing

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.

Figure 36. Split Supply Bypassing Capacitors

Figure 37. Single Supply Bypassing Capacitors

20

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