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EDGE4707B Schematic ( PDF Datasheet ) - Semtech Corporation

Teilenummer EDGE4707B
Beschreibung Quad Channel Per-Pin Precision Measurement Unit
Hersteller Semtech Corporation
Logo Semtech Corporation Logo 




Gesamt 25 Seiten
EDGE4707B Datasheet, Funktion
TEST AND MEASUREMENT PRODUCTS
Description
Edge4707B
Quad Channel Per-Pin
Precision Measurement Unit
Features
The Edge4707B is a precision measurement unit designed
for automatic test equipment and instrumentation.
Manufactured in a wide voltage CMOS process, it is a
monolithic solution for a quad channel per pin PMU.
Each channel of the Edge4707B features a PMU that can
force or measure voltage over a 15V I/O range, and
supports 4 current ranges: 2 µA, 200 µA, 20 µA, and 2
mA.
Each channel of the Edge4707B features an on-board
window comparator that provides two bits of information:
DUT too high and DUT too low. There is also a monitor
function which provides a real time analog signal
proportional to either the measured voltage or current.
The Edge4707B is designed to be a low power, low cost,
small footprint solution to allow high pin count testers to
support a PMU per pin.
In addition, two independent switches per channel (for a
central PMU force and sense) plus two wide voltage analog
muxes per channel are included.
Applications
• Automated Test Equipment
- Memory Testers
- VLSI Testers
- Mixed Signal Tester
• FV / MI Capability
• FI / MV Capability
• FV / MV Capability
• FI / MI Capability
• 4 Current Ranges (2 µA, 20 µA, 200 µA, 2mA)
• –2V to +13V Output Range (Zero Current)
• 0V to 11V Output Range (Full Scale Current)
• FV Linearity to ± .025% FSR
• Central PMU Switches
• Per Pin Super Voltage Switches
Functional Block Diagram
E_SN_IN
E_FC_IN
VINP
IVIN
FV / FI*
MI / MV*
IVMAX
IVMIN
DISABLE
VINP
IVIN
FV / FI*
MI / MV*
IVMAX
IVMIN
DISABLE
VINP
IVIN
FV / FI*
MI / MV*
IVMAX
IVMIN
DISABLE
VINP
IVIN
FV / FI*
MI / MV*
IVMAX
IVMIN
DISABLE
CHANNEL 0
45*
100Ω∗
1KΩ∗
COMPARATORS
DETECTOR LOGIC
VOLTAGE MONITOR
CHANNEL 1
45Ω∗
100Ω∗
1KΩ∗
COMPARATORS
DETECTOR LOGIC
VOLTAGE MONITOR
CHANNEL 2
45Ω∗
100Ω∗
1KΩ∗
COMPARATORS
DETECTOR LOGIC
VOLTAGE MONITOR
CHANNEL 3
45Ω∗
100Ω∗
1KΩ∗
COMPARATORS
DETECTOR LOGIC
VOLTAGE MONITOR
* Typical values
FORCE
SENSE
DUTLTH
DUTGTL
IVMON
FORCE
SENSE
DUTLTH
DUTGTL
IVMON
FORCE
SENSE
DUTLTH
DUTGTL
IVMON
FORCE
SENSE
DUTLTH
DUTGTL
IVMON
Revision 3 / December 18, 2002
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EDGE4707B Datasheet, Funktion
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 = 1M
0
1
B
± 20 µA
RB = 100K
1
0
C
± 200 µA
RC = 10K
1 1 D ± 2 mA RD = 1K
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
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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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EDGE4707B pdf, datenblatt
TEST AND MEASUREMENT PRODUCTS
Application Information
Required External Components (Per Channel)
Edge4707B
22 pF
COMP1
COMP2
RA
DUT LTH
To LVTTL Gate
To LVTTL Gate DUT GTL
RB
RC
Edge4707B RD
RES_IN
COMP4
100 pF
COMP3
FORCE
SENSE
1 M
100 K
10 K
1 K
47 pF
To DUT
.1 µF
VCC VDD
VEE
.01 µF
.01 µF .1 µF
VCC VDD
VEE
Actual decoupling and compensation
capacitor values depend on the system environment.
.01 µF
Revision 3 / December 18, 2002
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