7.5 Layout

7.5.1 Layout Guidelines

Figure 7-6 shows a layout recommendation with the critical placement of the decoupling capacitors. The same

component reference designators are used as in the Power Supply Recommendations section. Decoupling

capacitors are placed as close as possible to the AMC3301 supply pins. For best performance, place the shunt

resistor close to the INP and INN inputs of the AMC3301 and keep the layout of both connections symmetrical.

To avoid causing errors in the measurement by the input bias currents of the AMC3301, connect the high-side

ground pin (HGND) to the INN-side of the shunt resistor. Use a separate trace in the layout to make this

connection to maintain equal currents in the INN and INP traces.

7.5.2 Layout Example

R4

R2

AMC3301

Clearance area, to be

kept free of any

conductive materials.

To MCU I/O (optional)

GND

INP

INN

3.3-V or 5-V supply

HGND

VDD

DIAG

Top Metal

Inner or Bottom Layer Metal

Via

OUTP

OUTN

To analog filter / ADC / MCU

To analog filter / ADC / MCU

C3

C2

C1

C5

C6

FB2

FB1

FB3

Figure 7-6. Recommended Layout of the AMC3301

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AMC3301

SBAS917C – AUGUST 2019 – REVISED MAY 2025

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