EVAL-AD5520EBZ Analog Devices Inc, EVAL-AD5520EBZ Datasheet - Page 16

• Manufacturer Part Number: EVAL-AD5520EBZ
• Description: Evaluation Board I.c.
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD5520EBZ

• Main Purpose: Test and Measurement, Per-pin Parametric Measurement Unit (PPMU)
• Utilized Ic / Part: AD5520
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AD5520
CIRCUIT OPERATION
FORCE VOLTAGE
Most PMU measurements are performed while in force voltage
and measure current modes; for example, when the device is
used as a device power supply, or in continuity or leakage
testing. In the force voltage mode, the voltage at analog input
FIN is mapped directly to the voltage forced at the DUT.
When in force voltage and measure current modes, the
maximum voltage applied to the input corresponds to the
maximum current outputs. Figure 22 shows the transfer
function when forcing a voltage.
Figure 22. Force Voltage Transfer Function
V
CLH
R
V
S
V
×
CLH
CLH
× 16
R
R
S
DUT
× 16
V
I
DUT
DUT
V
R
CLL
V
S
CLL
× 16
×
R
R
S
DUT
× 16
V
CLH
V
V
FIN
FIN
Rev. B | Page 16 of 24
MEASURE CURRENT
Figure 23 shows a simplified diagram of the PMU when in force
voltage mode. The control loop consists of the force amplifier
with the voltage sense amplifier making up the feedback path.
Current flowing through the DUT is measured by sensing the
current flowing through a selectable sense resistor, which is in
series with the DUT. The current sense amplifier (Gain = 16)
generates a voltage at its output, which is proportional to the
current flowing through the DUT. This voltage is compared to
the CLL and CLH levels to ensure the clamp voltages have not
been exceeded. Strobing CPCK and STB provides information
about the voltage level with respect to the comparator levels,
CPH and CPL.
VFIN
CONDITION
OUTPUT
VCLH
V
V
CLH
CLL
Figure 23. Force Voltage, Measure Current Mode
V
< I
> I
DUT
VCLL
DUT
DUT
= V
V
V
× R
× R
FIN
FIN
VMEASIOUT
VMEASVOUT
CLH
CLL
REFGNDI/V
S
S
× 16
× 16
V
V
CLH
CLL
V
< I
DUT
< I
DUT
DUT
= V
× R
× R
CLH
G = 16
G = 1
S
S
× 16
× 16
V
V
CLH
CLL
MEASIHx
MEASVH
V
MEASVL
MEASIL
> I
> I
DUT
FOHx
DUT
DUT
= V
× R
× R
CLL
S
S
× 16
× 16
R
R
S
DUT