EDGE4707B 데이터 시트보기 (PDF) - Semtech Corporation

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EDGE4707B

Quad Channel Per-Pin Precision Measurement Unit

Semtech Corporation 

Edge4707B

TEST AND MEASUREMENT PRODUCTS

Circuit Description

Circuit Overview

Control Inputs

The Edge4707B 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

FV/FI* is a TTL compatible input which determines whether

the PMU forces voltage or current, 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 PMU. Table 1 describes the modes

of operation controlled by these pins.

Each PMU channel can force or measure voltage over a

15V range and force or measure current over four distinct

ranges:

• ± 2 µA

• ± 20 µA

• ± 200 µA

• ± 2 mA.

An on-board window comparator provides two bit output

range classification. Also, a monitor passes a real time

analog voltage which tracks either the measured current

or voltage.

PPMU Functionality

The trapezoid in Figure 1 describes the current-voltage

functionality of the PMU with VCC = 15.5V and

VEE = –4.5V, in Range D.

V

VOUT (@ I = 0) = 13.25V

No restrictions

VCC = +15.5V

VOUT (@ 200 µA) = 12.8V (in Range D)

VOUT (@ 2 mA) = 11.25V

FV / FI*

0

0

1

1

MI/MV*

0

1

0

1

Mode of Operation

Force Current, Measure Voltage

Force Current, Measure Current

Force Voltage, Measure Voltage

Force Voltage, Measure Current

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 to 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 4707B.

RS1

RS0

Range

Current

Range

"Nominal" Ext. R

0

0

A

± 2 µA

RA = 1MΩ

0

1

B

± 20 µA

RB = 100KΩ

1

0

C

± 200 µA

RC = 10KΩ

1

1

D

± 2 mA

RD = 1KΩ

IMIN (–2 mA)

IMAX (2 mA)

FORCE/SENSE

Table 2.

VOUT (@ –200 µA) = –1.8V (in Range D)

VOUT (@ I = 0) = –2.25V

VEE = –4.5V

VOUT (@ 2 mA) = –0.25V

NOTE: Negative current implies current is flowing into the 4707 from DUT.

Figure 1. PMU Functionality

Revision 3 / December 18, 2002

6

FORCE is an analog output which either forces a current

or forces a voltage, depending on which operating mode

is selected.

SENSE is a high impedance analog input which measures

the DUT voltage input in the MV operating mode.

FORCE and SENSE are brought out to separate pins to

allow remote sensing.

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