AD5520JST Analog Devices Inc, AD5520JST Datasheet - Page 17

• Manufacturer Part Number: AD5520JST
• Description: IC SNGL PARAMETRIC MEASURE64LQFP
• Manufacturer: Analog Devices Inc
• Type: Per-pin Parametric Measurement Unit (PPMU)r

Specifications of AD5520JST

• Rohs Status: RoHS non-compliant
• Applications: Automatic Test Equipment
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Operating Temperature (min): 0C
• Operating Temperature (max): 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• For Use With: EVAL-AD5520EBZ - BOARD EVAL FOR AD5520
• Lead Free Status / RoHS Status: Not Compliant

FORCE CURRENT
In force current mode, the voltage at FIN is now converted to a
current through the following relationship:
Figure 24 shows a simplified diagram of the PMU when in force
current mode. The control loop consists of the force amplifier
with the current sense amplifier making up the feedback path.
In this case, voltage at the DUT is sensed across the voltage
measure amplifier (Gain = 1) and presented at the MEASVOUT
output.
VFIN
MEASURE VOLTAGE
A DUT voltage is tested via the voltage measure amplifier by a
window comparator to ensure that CPH and CPL levels are not
exceeded. In addition, the DUT voltage is automatically tested
against the voltage levels at the clamp, and clamp flags are
enabled if the DUT voltage exceeds either of the levels.
Force Current = V
CONDITION
VCLH
OUTPUT
Figure 24. Current Force, Voltage Measure Mode
VCLL
V
V
V
V
I
DUT
CLH
CLL
FIN
VMEASIOUT
REFGNDI/V
VMEASVOUT
CLH
CLL
FIN
=
< V
> V
/(R
V
DUT
R
DUT
FIN
S
SENSE
V
V
I
DUT
CLH
CLL
× 16)
=
< V
< V
V
R
DUT
DUT
CLH
S
G = 16
G = 1
V
V
I
DUT
CLH
CLL
=
> V
> V
V
DUT
MEASIHx
DUT
R
CLL
MEASVH
MEASVL
S
MEASIL
FOHx
Rev. B | Page 17 of 24
R
R
S
DUT
SHORT CIRCUIT PROTECTION
The AD5520 is designed to withstand a direct short circuit on
any of the amplifier outputs.
Figure 25 illustrates the transfer function of the current force
mode.
Figure 25. Current Force Transfer Function
V
CLH
V
R
CLH
DUT
V
CLH
I
V
DUT
DUT
V
R
V
CLH
DUT
CLL
V
CLH
V
V
AD5520
FIN
FIN