參數(shù)資料
型號(hào): AD5520JST-REEL
廠商: ANALOG DEVICES INC
元件分類(lèi): 模擬信號(hào)調(diào)理
英文描述: Per Pin Parametric Measurement Unit/Source Measure Unit
中文描述: SPECIALTY ANALOG CIRCUIT, PQFP64
封裝: MS-026BCD, LQFP-64
文件頁(yè)數(shù): 13/20頁(yè)
文件大?。?/td> 763K
代理商: AD5520JST-REEL
REV. A
AD5520
–13–
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 maxi-
mum voltage applied to the input corresponds to the maximum
current outputs. Figure 4 shows the transfer function when forcing
a voltage.
V
DUT
V
CLH
R
S
16
R
DUT
V
CLL
R
S
16
R
DUT
V
CLH
R
S
16
I
DUT
V
CLH
V
CLH
V
FIN
V
FIN
V
CLL
R
S
16
Figure 4. Voltage Force Transfer Function
Measure Current
Figure 5 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
will provide information
about the voltage level with respect to the comparator levels,
CPH and CPL.
MEASIHx
MEASIL
G =
16
MEASVH
MEASVL
G =
1
FOHx
R
S
R
DUT
FIN
VMEASIOUT
VMEASVOUT
M
M
CLH
CLL
VCLL
VCLH
VFIN
CONDITION
OUTPUT
V
DUT
= V
FIN
V
DUT
= V
CLH
V
DUT
= V
CLL
V
CLH
> I
DUT
R
S
V
CLL
< I
DUT
R
S
16
16
V
CLH
< I
DUT
R
S
V
CLL
< I
DUT
R
S
16
16
V
CLH
> I
DUT
R
S
V
CLL
> I
DUT
R
S
16
16
REFGNDI/V
V
V
Figure 5. Voltage Force, Measure Current Mode
Force Current
In the force current mode, the voltage at FIN is now converted
to a current through the following relationship:
ForceCurrent
V
R
/
FIN
SENSE
=
Figure 6 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 feed-
back path. In this case, voltage at the DUT is sensed across
the voltage measure amplifier (Gain = 1) and presented at
the MEASVOUT output.
MEASIHx
MEASIL
G =
16
MEASVH
MEASVL
G =
1
FOHx
R
S
R
DUT
FIN
VMEASIOUT
VMEASVOUT
M
M
CLH
CLL
VCLL
VCLH
VFIN
REFGNDI/V
CONDITION
OUTPUT
I
DUT
=
V
CLH
> V
DUT
V
CLL
< V
DUT
V
FIN
R
S
I
DUT
= V
CLH
R
S
I
DUT
= V
CLL
R
S
V
CLH
< V
DUT
V
CLL
< V
DUT
V
CLH
> V
DUT
V
CLL
> V
DUT
V
V
Figure 6. Current Force, Voltage Measure Mode
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