LTC1151C(Rev0) データシートの表示（PDF） - Linear Technology
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LTC1151C Datasheet PDF : 8 Pages
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LTC1151
APPLICATI S I FOR ATIO
NOMINALLY UNNECESSARY
RESISTOR USED TO
THERMALLY BALANCE
OTHER INPUT RESISTOR
RESISTOR LEAD, SOLDER,
COPPER TRACE JUNCTION
LEAD WIRE/SOLDER
COPPER TRACE JUNCTION
+
LTC1151
–
OUTPUT
1151 F01
Figure 1. Extra Resistors Cancel Thermal EMF
Resistors are another source of thermal EMF errors. Table
1 shows the thermal EMF generated for different resistors.
The temperature gradient across the resistor is important,
not the ambient temperature. There are two junctions
formed at each end of the resistor and if these junctions are
at the same temperature, their thermal EMFs will cancel
each other. The thermal EMF numbers are approximate
and vary with resistor value. High values give higher
thermal EMF.
Table 1. Resistor Thermal EMF
RESISTOR TYPE
Tin Oxide
Carbon Composition
Metal Film
Wire Wound
Evenohm, Manganin
THERMAL EMF/°C GRADIENT
>1mV/°C
∼450µV/°C
∼20µV/°C
∼2µV/°C
PACKAGE-INDUCED OFFSET VOLTAGE
Package-induced thermal EMF effects are another impor-
tant source of errors. They arise at the junctions formed
when wire or printed circuit traces contact a package lead.
Like all the previously mentioned thermal EMF effects,
they are outside the LTC1151’s offset nulling loop and
cannot be cancelled. The input offset voltage specification
of the LTC1151 is actually set by the package-induced
warm-up drift rather than by the circuit itself. The thermal
time constant ranges from 0.5 to 3 minutes, depending on
package type.
ALIASING
Like all sampled data systems, the LTC1151 exhibits
aliasing behavior at input frequencies near the sampling
frequency. The LTC1151 includes a high frequency cor-
rection loop which minimizes this effect. As a result,
aliasing is not a problem for many applications.
For a complete discussion of the correction circuitry and
aliasing behavior, please refer to the LTC1051/LTC1053
data sheet.
LOW SUPPLY OPERATION
The minimum supply for proper operation of the LTC1151
is typically 4.0V (±2.0V). In single supply applications,
PSRR is guaranteed down to 4.7V (±2.35V) to ensure
proper operation at minimum TTL supply voltage of 4.75V.
TYPICAL APPLICATI
S
High Voltage Instrumentation Amplifier
1k
V+
1M
–IN
2– 8
1/2
LTC1151
3+
0.1µF
1
1M
1k
+IN
6–
1/2
LTC1151
5+
4
V–
7
VOUT
GAIN = 1000V/V
OUTPUT OFFSET < 5mA
0.1µF
1151 TA03
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of circuits as described herein will not infringe on existing patent rights.
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