EDGE4717D データシートの表示（PDF） - Semtech Corporation

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EDGE4717D

Quad Channel, Per Pin Precision Measurement Unit

Semtech Corporation 

Edge4717D

TEST AND MEASUREMENT PRODUCTS

Circuit Description (continued)

TEST

0

1

Function

Normal Operation

TEST_IN used for sample-

and-hold testing

Table 5.

VINP

VREF + 5.5V

VREF + 3.5V

VREF

VREF – 3.5V

VREF – 5.5V

Corresponding Forced Current

≥ Imax (Full-Scale, Ranges A, B, C)

≥ Imax (Full-Scale, Range D)

0

≤ Imin (Full-Scale, Range D)

≤ Imin (Full-Scale, Ranges A, B, C)

Test Head Ground Reference

Table 6.

The Edge4717D features a test head ground referencing

feature which allows the force voltage function to be

referenced to a separate ground reference other than the

ground (GND) power used for the device. The test head

ground should be connected to the DUT_GND pin of the

Edge4717D. The maximum allowed variation between

DUT_GND and GND is ± 250 mV.

Force Voltage Mode

In the FV mode (FV/FI* = 1), VINP is a high impedance,

analog voltage input that maps directly to the voltage forced

at the FORCE pin.

In the Force Current mode, the voltage at VINP is divided

by 2.5 internally on the chip, so that a ± 2V range is used

internally for forcing currents on Ranges A, B, and C. Range

D uses a ± 1.2V range across REXT for forcing currents.

Measure Voltage Mode

In the MV mode (MI/MV* = 0), DUT voltage is measured

via the SENSE input pin. This measured voltage can be

displayed on the IVMON pin and tested using the internal

window comparator.

Comparator

Measure Current Mode

In the MI mode (MI/MV* = 1), a current monitor is

connected in series with the PMU forcing amplifier. This

monitor generates a voltage that is proportional to the

current passing through it, and is brought out to IVMON.

This voltage (corresponding to the measured current) can

also be tested by the on-board window comparator.

The Edge4717D features an on-board window compara-

tor which provides two-bit measurement range classifica-

tion. IVMAX and IVMIN are high impedance analog inputs

that establish the upper and lower thresholds for the win-

dow comparator. COMP_IN is the window comparator in-

put pin. COMP_IN should be connected to IVMON on

each channel if it is desired to use the comparator to

indicate PMU measurements.

Force Current Mode

In the FI mode (FV/FI* = 0), VINP is a high impedance,

analog voltage input that is converted into a current at

the FORCE pin (see Figure 1) using the following

relationship:

VINP – VREF

Forced Current = (REXT * 2.5)

where VREF is the reference voltage input at the REF pin

which is nominally set at 2.25V. (Positive current is de-

fined as current flowing out of the PMU.) Table 6 de-

scribes the relationship between the voltage applied to

VINP and the current at FORCE for Ranges A, B, and C.

In the MI mode, an I/V MAX input of +2V will set the

upper threshold of the window comparator to a voltage

corresponding to +FSC (full-scale current), and an I/V MIN

input of –2V will set the lower threshold to a voltage

corresponding to –FSC for Ranges A, B, and C. Similarly

for Range D, –1.2V corresponds to sinking full-scale

current, and +1.2V corresponds to sourcing full-scale

current (positive current is defined as current flowing out

of the PMU).

DUTGTL the DUTLTH are LVTTL compatible outputs which

indicate the range of the measured parameter in relation

to IVMIN and IVMAX. Comparator functionality is sum-

marized in Table 7.

 2005 Semtech Corp. / Rev. 5, 10/14/05

8

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