AD5520 datasheet(21/25 Pages) AD

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AD5520

Rev. B | Page 20 of 24

TYPICAL CONNECTION CIRCUIT FOR THE AD5520

Figure 26 shows the AD5520 as connected in a typical applica-

tion. The external components required are three compensation

capacitors and six sense resistors, depending on the number of

ranges required. If high current ranges >6 mA are required, an

external amplifier must be used with relays (or some form of

high current switch) to switch in the different current ranges to

the DUT. Other components are also required to make the

PMU function.

The PMU requires a number of discrete voltage levels: five DAC

levels for each PMU used in the system, two levels each for the

comparator and clamps, and one voltage level for the AD5520

force input voltage. To use the information measured at the

DUT, an ADC such as the AD7665 (a 16-bit ADC), must be

connected to the MEASOUT pin to convert the measured

current or voltage to digital for analysis.

MEASI4H

FIN

BW SELECT

FOH1

FOH2

FOH3

FOH0

AVEE AVCC

MEASI3H

CLH

CLL

REFGND

MEASIOUT

MEASOUT

MEASVOUT

CPH

CPOH

CPOL

CPL

MEASI5H

MEASIL

GUARDIN

GUARD

MEASVH

MEASVL

AGND

QM5

QM4

CLAMP

DETECT

ISENSE

INST AMP

VSENSE

INST AMP

LOGICS

CPCK

AD5520

COMPARATOR

125k

12.5k

1.25k

125

12.5

3.126

AD815

RELAY

<±11.5V

DUT

<±100mV

±11V

≥

MEASI2H

MEASI1H

MEASI0H

+15V –15V

100pF

1000pF

3000pF

FOH

FORCE

AMPLIFIER

G = 16

G = 1

Figure 26. Typical Configuration of the AD5520 as Used in an ATE Circuit

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