AMC0X06M05 datasheet(35/47 Pages) TI2

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8.4 Power Supply Recommendations

In a typical application, the high-side power supply (AVDD) for the AMC0x06M05 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 AMC0x06M05 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 8-4 shows a

decoupling diagram for the AMC0x06M05.

R3 49.9

R2 10

R1 10

C5 10 nF

AVDD

DVDD

from MCU

to MCU

AVDD

AGND

INP

INN

DVDD

CLKIN

DOUT

DGND

C2 1 µF

C1 100 nF

C4 1 µF

C3 100 nF

C6 1 nF

C7 1 nF

Figure 8-4. Decoupling of the AMC0x06M05

Verify 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, where the dielectric field strength is higher than in taller components. Reputable

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

8.5 Layout

8.5.1 Layout Guidelines

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

and filter capacitors. Place decoupling and filter capacitors as close as possible to the AMC0x06M05 input pins.

8.5.2 Layout Example

DOUT

CLKIN

Top Metal

Inner or Bottom Layer Metal

Via

AGND

AVDD

DVDD

Clearance area, keep free of any

conductive materials

DGND

INP

INN

CLKIN (from MCU)

to MCU

Figure 8-5. Recommended Layout of the AMC0x06M05

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