VOCM

V

+

10 PF

0.1 PF

+

-

0.01 PF

0.1 PF

VOCM

0.1 PF

V

+

V

-

0.01 PF

0.01 PF

10 PF

10 PF

0.1 PF

+

-

LMP8350

www.ti.com

SNOSB80C – FEBRUARY 2011 – REVISED OCTOBER 2015

9 Power Supply Recommendations

9.1 Power Supply and VOCM Bypassing

The LMP8350 requires supply bypassing capacitors as shown in Figure 36 and Figure 37 for fastest settling time

and overall stability.

Figure 36. Split-Supply Bypassing Capacitors

The 0.01-µF and 0.1-µF capacitors should be leadless surface mount (SMT) ceramic capacitors and should be

no more than 3 mm from the supply pins. The SMT capacitors should be connected directly to a ground plane.

Thin traces or small vias will reduce the effectiveness of bypass capacitors.

Figure 37. Single-Supply Bypassing Capacitors

Also shown in Figure 36 and Figure 37 is a capacitor from the VOCM pin to ground. The VOCM pin sets the output

common-mode voltage. Any noise on this input is transferred directly to the output. The VOCM pin should be

bypassed even if the pin in not used. There is an internal resistive divider on chip to set the output common-

mode voltage to the midpoint of the supply pins. The impedance looking into this pin is approximately 30 k

Ω. If a

different output common-mode voltage is desired drive this pin with a clean, accurate voltage reference.

Copyright © 2011–2015, Texas Instruments Incorporated

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