EDGE4717D データシートの表示（PDF） - Semtech Corporation
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EDGE4717D Datasheet PDF : 22 Pages
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Edge4717D
TEST AND MEASUREMENT PRODUCTS
Circuit Description
Circuit Overview
Control Inputs
The Edge4717D is a quad channel parametric test and
measurement unit that can :
• Force Voltage / Measure Current
• Force Current / Measure Voltage
• Force Voltage / Measure Voltage
• Force Current / Measure Current
• Measure Voltage / Force Disable
The Edge4717D features a PMU (per channel) that can
force or measure voltage over a 15V range and force or
measure current over four distinct ranges:
• ± 3.2 µA
• ± 80 µA
• ± 2 mA
• ± 30 mA
The Edge4717D features an on-board window comparator
(per channel) that provides two bit measurement range
classification.
FV / FI* is a TTL compatible input which determines whether
the PMU forces current or voltage, and MI/MV* is a TTL
compatible input which determines whether the PMU
measures current or voltage. FV/FI* and MI/MV* are
independent for each channel of the Edge4717D. HIZ is
a TTL compatible input which can be used to place the
PMU’s force amp into a high impedance state. Tables 1
and 2 describe the modes of operation related to these
three input pins.
HIZ
FV / FI* MI/MV*
Mode of Operation
1
X
X
High Impedance
0
0
0
Force Current, Measure Voltage
0
0
1
Force Current, Measure Current
0
1
0
Force Voltage, Measure Voltage
0
1
1
Force Voltage, Measure Current
Also, a monitor pin, IVMON, is capable of outputting either
a real time analog voltage signal which tracks the measured
parameter, or a sampled value of the measurement
parameter captured using the sample and hold circuitry.
PMU Functionality
The trapezoid in Figure 1 describes the current-voltage
functionality of the PMU with VCC = 12V and VEE =
–8V, in Range D.
Table 1.
RS0 and RS1 are TTL compatible inputs to an internal
analog MUX which selects an external resistor
corresponding to a desired current range. The truth table
for RS0 and RS1, along with the associated external
resistor values and current ranges, is shown in Table 2.
RS0 and RS1 are independent for each channel of the
Edge4717D.
V
VOUT (@ I = 0) = 9.25V VCC = 12
No restrictions
VOUT (@ 30 mA) = 9V
RS1 RS0 Range
0
0
A
0
1
B
Current
Range
3.2 µA
80 µA
"Nominal" Ext. R
RA = 625KΩ
RB = 25KΩ
1
0
C
2 mA
RC = 1KΩ
IMIN (–30 mA)
IMAX (30 mA)
1
1
D
30 mA
RD = 40Ω
VOUT (@ –30 mA) = –2.5V
VOUT (@ –10 mA) = –5.1 (in Range D)
VOUT (@ I = 0) = –5.5V
VEE = –8V
NOTE: Negative current is defined as current flowing into PMU from DUT.
Figure 1. PMU Functionality
2005 Semtech Corp. / Rev. 5, 10/14/05
6
Table 2.
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