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LM363H-10 датащи(PDF) 10 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
номер детали LM363H-10
подробное описание детали  LM363 Precision Instrumentation Amplifier
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производитель  NSC [National Semiconductor (TI)]
домашняя страница  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM363H-10 датащи(HTML) 10 Page - National Semiconductor (TI)

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Application Hints (Continued)
TLH5609 – 9
c Single Supply Unipolar Output
d Single Supply Bipolar Output
FIGURE 1 Reference Connections
(Continued)
OUTPUTS
The LM363’s output can typically swing within 1V of the
supplies at light loads While specified to drivea2kX load
to g10V current limit is typically 15 mA at room tempera-
ture The output can stably drive capacitive loads up to
400 pF For higher load capacitance the amplifier may be
overcompensated (see COMPENSATION section follow-
ing) The output may be continuously shorted to ground
without damaging the device
OFFSET VOLTAGE
The LM363’s offset voltage is internally trimmed to a very
low value
Note that data sheet values are given at
Tje25 C VCMe0V and Va eVbe15V For other condi-
tions warm-up drift temperature drift common-mode rejec-
tion and power supply rejection must be taken into account
Warm-up drift due to chip and package thermal gradients is
an effect separate from temperature drift Typical warm-up
drift is tabulated in the Electrical Characteristics settling
time is approximately 5 minutes in still air At load currents
up to 5 mA
thermal feedback effects are negligible
(DVOSs2mVatGe1000)
Care must be taken in measuring the extremely low offset
voltages of the high gain amplifiers Input leads must be
held isothermal to eliminate thermocouple effects Oscilla-
tions due to either heavy capacitive loading or stray capaci-
tance from input to output can cause erroneous readings
In either case overcompensation will help High frequency
noise fed into the inputs may be rectified internally and pro-
duce an offset shift A simple low-pass RC filter will usually
cure this problem (
Figure 2 ) Use film type resistors for their
low thermal EMF In highly noisy environments LC filters
can be substituted for increased RF attenuation
TLH5609 – 10
FIGURE 2 Low Pass Filter Prevents RF Rectification
Instrumentation amplifiers have both an input offset voltage
(VIOS) and an output offset voltage (VOOS) The total input-
referred offset voltage (VOSRTI) is related to the instrumen-
tation amplifier gain (G) as follows VOSRTIeVIOSaVOOS
G The offset voltage given in the LM363 specifications is
the total input-referred offset As long as only one gain is
used offset voltage can be nulled at either input or output
as shown in
Figures 3a and 3b When the 16-pin device is
used at multiple gain settings both VIOS and VOOS should
be nulled to get minimum offset at all gains as shown in
Figure 3c The correct procedure is to trim VOOS for zero
output at Ge10 then trim VIOS at Ge1000
TLH5609 – 11
FIGURE 3 Offset Voltage Trimming
10


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