Data Sheet AS8118

Revision 1.8, 15-Feb-05

Page 23 of 30

Application Circuit

C6

R7

C8

C7

VAR

D1

NL

VI

VO

GND

IC1

D2

AS8118

1

3

2

R2

R1A

R1B

C1

C13

C14

C2

R3

C3

R4

LOAD

C12

C9

C11

C10

XTAL

VDD

POWER IN

LED

GND

PROG

DIRO

CAL

MOP

MON

VDD

VDD

C4

R5

C5

R6

Note:

1.

There must be proper ground connection between the calibration hardware and the meter under calibration during

‘Calibration Mode’. This ensures that the programming procedure is not effected by spurious signals. Such spurious

signals could originate from load switching during calibration.

2.

When using a low resistance shunt for current sensing, a small parasitic inductance introduced by the shunt can have

negative effects on the measurement accuracy. The filters on the current inputs designated by the components R5, C5

and R6, C4 provide a cancellation effect on the parasitic shunt inductance. The filters assume a typical inductance of

between 1nH and 2nH.