7.4 Power Supply Recommendations

In a typical application, the high-side power supply (AVDD) for the AMC0136 is generated from the low-side

supply (DVDD) by an isolated DC/DC converter. A low-cost option is based on the push-pull driver SN6501 and

a transformer that supports the desired isolation voltage ratings.

The AMC0136 does not require any specific power-up sequencing. The high-side power supply (AVDD) is

decoupled with a low-ESR, 100nF capacitor (C1) parallel to a low-ESR, 1μF capacitor (C2). The low-side power

supply (DVDD) is equally decoupled with a low-ESR, 100nF capacitor (C3) parallel to a low-ESR, 1μF capacitor

(C4). Place all four capacitors (C1, C2, C3, and C4) as close to the device as possible. Figure 7-4 shows a

decoupling diagram for the AMC0136.

R3 49.9

from MCU

to MCU

RSNS

AVDD

DVDD

AVDD

AGND

IN

SNSN

DVDD

CLKIN

DOUT

DGND

R1

VAC

C2 1µF

C1 100nF

C4 1µF

C3 100nF

C5 100pF

Figure 7-4. Decoupling of the AMC0136

Capacitors provide adequate effective capacitance under the applicable DC bias conditions experienced in the

application. Multilayer ceramic capacitors (MLCC) typically exhibit only a fraction of the nominal capacitance

under real-world conditions. Consider this factor when selecting these capacitors. This issue is especially acute

in low-profile capacitors, in which the dielectric field strength is higher than in taller components. Reputable

capacitor manufacturers provide capacitance versus DC bias curves that greatly simplify component selection.

7.5 Layout

7.5.1 Layout Guidelines

The Layout Example section provides a layout recommendation showing the critical placement of the decoupling

and filter capacitors. Decoupling and filter capacitors are placed as close as possible to the AMC0136 input pins.

7.5.2 Layout Example

Top Metal

Inner or Bottom Layer Metal

Via

C2

C1

CLKIN (from MCU)

to MCU

DOUT

IN

VAC

DVDD

AGND

DGND

AVDD

Clearance area, keep free of

any conductive materials

R3

C3

C4

Figure 7-5. Recommended Layout of the AMC0136

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AMC0136

SBASAZ0A – AUGUST 2024 – REVISED DECEMBER 2024

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