AD5520 Analog Devices, AD5520 Datasheet - Page 15

• Manufacturer Part Number: AD5520
• Description: Per Pin Parametric Measurement Unit/Source Measure Unit
• Manufacturer: Analog Devices

It is good practice to employ compact, minimum lead length
PCB layout design. Leads to the input should be as short as
possible to minimize IR drops and stray inductance.
TYPICAL CONNECTION CIRCUIT FOR THE AD5520
Figure 8 shows the AD5520 connected as it would be in a typical
application. The external components required are three com-
pensation capacitors and six sense resistors, depending on how
many ranges are required. If high current ranges > 6 mA are
REV. A
FIN
REFGND
MEASIOUT
MEASOUT
MEASVOUT
CPH
CPOH
CPOH
CPL
CLH
CLL
AD5520
COMPARATOR
CPCK
Figure 8. Typical Configuration of the AD5520 as Used in an ATE Circuit
3000pF
BW SELECT
1000pF
100pF
DETECT
AMPLIFIER
CLAMP
LOGICS
FORCE
G = 16
INST AMP
INST AMP
G = 1
V
I
SENSE
SENSE
+15V –15V
AV
EE
AV
G = 1
CC
–15–
GUARDIN
MEASI5H
MEASI4H
MEASI3H
MEASI2H
MEASI1H
MEASI0H
MEASVH
MEASVL
MEASIL
GUARD
AGND
required, an external amplifier must be used with relays 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 utilize the information gathered from the DUT, an
ADC (such as the AD7665 16-Bit ADC) must be connected to
the MEASOUT pin to convert the measured current or voltage
to the digital world for analysis.
FOH3
FOH2
FOH1
FOH0
QM5
QM4
FOH
125k
12.5k
1.25k
DUT
< 100mV
AD815
11V
125
RELAY
12.5
< 11.5V
3.126
AD5520