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| 型號： | E737-EDGE737 |
| 英文描述： | Per-Pin Precision Measurement Unit |
| 中文描述： | 每針精密測量單元 |
| 文件頁數(shù)： | 16/21頁 |
| 文件大?。?/td> | 188K |
| 代理商： | E737-EDGE737 |
4
2000 Semtech Corp.
www .semtech.com
TEST AND MEASUREMENT PRODUCTS
Edge737
PRELIMINARY
Circuit Description
Circuit Overview
The Edge737 is a parametric test and measurement unit
that can :
Force Voltage / Measure Current
Force Current / Measure Voltage.
The Edge737 can force or measure voltage over a +7V to
-5V range, and force or measure current over four distinct
ranges:
± 40 mA
± 1 mA
± 100 A
± 10 A.
An on board window comparator provides three-bit
measurement range classification. Also, a monitor passes
a real time analog signal which tracks either the DUT’s
current or voltage performance.
Control Inputs
MODE SEL is a digital input which determines whether
the PMU forces voltage or current, when it is not placed in
a high impedance state by the HIZ input (see Table 1).
Table 1.
RS1 and RS2 are digital inputs to an analog MUX which
establishes the full scale current range of the PMU. One
of four current ranges can be selected by using RS1 and
RS2 as shown in Table 2.
Table 2.
Comparator Outputs
The comparator outputs DUT GTL, DUT LTH, and
PASS/FAIL* are open drain outputs. When active (logical
0), they will pull to ground. When disabled (logical 1 or
DISABLE = 1), they require an external pull up resistor to
a positive voltage to achieve a high state.
Force / Sense
FORCE is an analog output which either forces a current
or forces a voltage, depending on which operating mode
is selected.
The SENSE pin is a high impedance analog input which
measures the DUT voltage input in the FI / MV operating
mode.
FORCE and SENSE are brought out to separate pins to
allow for remote sensing.
I/V MONITOR
I/V MONITOR is a real time analog output which tracks the
sensed parameter. I/V MONITOR functionality is described
in Table 3.
Table 3.
In the FI / MV mode, the output voltage is a 1:1 mapping
of the DUT voltage.
In the FV / MI mode, I/V MONITOR
follows the equation:
I(measured) = I/V MONITOR / (4.0 * REXT).
Using nominal values for the external resistors, I/V
MONITOR of +8.0V corresponds to Imax and –8.0V
corresponds to Imin of the selected current range.
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