E4237ALP Semtech, E4237ALP Datasheet - Page 14
E4237ALP
Manufacturer Part Number
E4237ALP
Description
Manufacturer
Semtech
Datasheet
1.E4237ALP.pdf
(39 pages)
Specifications of E4237ALP
Operating Temperature (max)
85C
Operating Temperature Classification
Commercial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Not Compliant
In FV mode, VINP is a high impedance analog input that
sets the output voltage at the RF and/or FORCE output
pins across their specified ranges as follows:
Force Current (FI) Mode
In the FI mode (FV/FI* = 0), the negative feedback to the
force amplifier is provided from the output of a 4x gain
instrument amplifier that senses the voltage across REXT.
In FI mode, VINP is a high impedance analog input that
sets the output current at the RF and/or FORCE pins across
their specified compliance voltage ranges as follows:
The nominal relationship between V
at the FORCE or RF pins is displayed in Table 8.
Measure Current (MI) Mode
In the MI mode (MI/MV* = 1), the current through REXT is
sensed using a 4x gain instrument amplifier, and the
resulting measurement can be tested using the on-chip
window comparator or routed to the IVMON pin.
TEST AND MEASUREMENT PRODUCTS
Circuit Description (continued)
V
Table 8. Nominal Forced Current/V
2005 Semtech Corp. / Rev. 5, 11/30/05
specified Offset Current
specified Offset Voltage
FORCE/RF
I
FORCE/RF
VINP
= V
V
+
–
V
0
2
2
N I
V
VINP
V
V
P
=
+
–
Force
Amp.
V
VINP
V
VINP
x specified FI Gain
+
REXT
4X
specified Linearity Error
specified Linearity Error
x specified Gain Error
+
–
–
F
F
l l u
l l u
I
S -
S -
F
VINP
O
VINP
a c
a c
R
C
0
FORCE/RF
e l
e l
E
/
and the current
C
C
Relationship
R
F
r u
r u
e r
e r
t n
t n
14
In the MI mode, the voltage displayed at IVMON relates
to the current measured through REXT as follows:
The nominal relationship between the current measured
(I
in Table 9.
Measure Voltage (MV) Mode
In the MV mode (MI/MV* = 0), DUT compliance voltage
is monitored using the SENSE pin, and the resulting
measurement can be tested using the on-chip window
comparator, or routed to the IVMON pin.
In the MV mode, the voltage monitored at SENSE maps
1:1 with the voltage measured at IVMON as follows:
measured
V
SENSE
IVMON
Output of
Force Amp
V
Table 9. Nominal
IVMON
specified MI Gain
+
–
) and the voltage displayed at IVMON is depicted
= V
F
F
l u
l u
Voltage
= I
S - l
S - l
I
m
SENSE
measured
a c
a c
+
e
–
s a
0
E4237/E4257/E4287
e l
e l
r u
d e
u C
u C
x specified Gain
e r r
e r r
I measured
+
specified Linearity Error
V
REXT
t n
t n
IVMON
4X
–
Specified Linearity Error x
specified Offset Current
/I
measured
Measured voltage can be
tested with window comparator
or routed to the IVMON pin.
V
FORCE/RF
Measured current can
be tested with window
comparator or routed to
IVMON
V I
+
–
V 0
V 2
V 2
M
specified Offset
Relationship
O
N
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