7.4 Power Supply Recommendations

The AMC0136 does not require any specific power-up sequence. 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 7-3 shows a

decoupling diagram for the AMC0136.

R3 49.9

from MCU

DVDD

to MCU

C4 1 µF

C3 100 nF

AVDD

AGND

IN

AGND

DVDD

CLKIN

DOUT

DGND

R1

VAC

C2 1 µF

C1 100 nF

R2

C5 100 pF

AVDD

Figure 7-3. Decoupling of the AMC0136

Capacitors have to 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. Take this factor into consideration when selecting these capacitors.

This problem 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 with the critical placement of the decoupling

capacitors (as close as possible to the AMC0136 supply pins). This section also depicts the placement of other

components required by the device. For best performance, place the sense resistor close to the device input pin

IN.

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 7-4. Recommended Layout of the AMC0136

AMC0136

SBASAZ0 – AUGUST 2024

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