0.1 …F 2.2 …F

GND1

3.3 V or 5 V

AINP

AINN

MCE

AMC1035

VDD

GND

DOUT

CLKIN

û Modulator

DATA

CLK

GND2

VISO

GND1

VCC

0.1 …F

0.1 …F

ISOW7821

10 …F

10 …F

SEL

EN1

GND2

3.3 V

SN6501

0.1 …F

10 …F

GND2

GND1

20 V

20 V

10 …F

0.1 …F

TLV70450

GND

GND1

0.1 …F

2.2 …F

GND2

VDD2

VDD1

AINP

AINN

MCE

AMC1035

VDD

GND

DOUT

CLKIN

û Modulator

GND1

DATA

CLK

GND1

VDD1

GND2

VDD2

0.1 …F

GND1

0.1 …F

IN

OUT

10 …F

D1

D2

VCC

GND

ISO7721

AINP

AINN

MCE

AMC1035

R3

R2

R1

VDD

GND

3.0 V to 3.6 V

C1

0.1 F

C2

2.2 F

SD-Cx

SD-Dx

TMS320F2837x

PWMx

DOUT

CLKIN

û Modulator

Phase X

optional

anti-aliasing filter

24

AMC1035

SBAS837B – AUGUST 2018 – REVISED APRIL 2020

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9 Power Supply Recommendations

For decoupling of the power supply, a 0.1-µF capacitor is recommended to be placed as close to the VDD pin of

the AMC1035 as possible, as shown in Figure 48, followed by an additional capacitor in the range of 1 µF to

10 µF.

Figure 48. Decoupling the AMC1035

Safety considerations or high common-mode voltage levels may require the AMC1035 to be galvanically isolated

from other parts of the system. Figure 49 shows an example of a circuit that uses the ISO7721 to isolate the

signal path and the SN6501 and a transformer to generate the required isolated power.

Figure 49. Galvanic Isolation of the AMC1035

Figure 50 shows an alternative solution that uses the ISOW7821 to isolate the signal path and provide the

isolated power supply for the AMC1035.

Figure 50. Galvanic Isolation of the AMC1035 for PCB Space-Constrained Applications