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OP177 Scheda tecnica(PDF) 8 Page - Analog Devices

Il numero della parte OP177
Spiegazioni elettronici  Ultraprecision Operational Amplifier
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
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OP177
APPLICATIONS INFORMATION
Gain Linearity
The actual open-loop gain of most monolithic op amps varies at
different output voltages. This nonlinearity causes errors in high
closed-loop gain circuits.
It is important to know that the manufacturer’s AVO specifi-
cation is only a part of the solution, since all automated testers
use endpoint testing and, therefore, only show the average gain.
For example, Figure 22 shows a typical precision op amp with a
respectable open-loop gain of 650 V/mV. However, the gain is
not constant through the output voltage range, causing
nonlinear errors. An ideal op amp would show a horizontal
scope trace.
Figure 22. Typical Precision Op Amp
Figure 23. OP177’s Output Gain Linearity Trace
Figure 24. Open-Loop Gain Linearity Test Circuit
Figure 23 shows the OP177’s output gain linearity trace with its
truly impressive average AVO of 12000 V/mV. The output trace
is virtually horizontal at all points, assuring extremely high gain
accuracy. PMI also performs additional testing to insure
consistent high open-loop gain at various output voltages.
Figure 24 is a simple open-loop gain test circuit for your own
evaluation.
THERMOCOUPLE AMPLIFIER WITH COLD-JUNCTION
COMPENSATION
An example of a precision circuit is a thermocouple amplifier
that must amplify very low level signals accurately without
introducing linearity and offset errors to the circuit. In this
circuit, an S-type thermocouple, which has a Seebeck coefficient
of 10.3 µV/°C, produces 10.3 mV of output voltage at a
temperature of 1,000°C. The amplifier gain is set at 973.16.
Thus, it will produce an output voltage of 10.024 V. Extended
temperature ranges to beyond 1,500°C can be accomplished by
reducing the amplifier gain. The circuit uses a low-cost diode to
sense the temperature at the terminating junctions and in turn
compensates for any ambient temperature change. The OP177,
with its high open-loop gain, plus low offset voltage and drift
combines to yield a very precision temperature sensing circuit. Cir-
cuit values for other thermocouple types are shown in Table I.
Table I.
Thermo-
Seebeck
couple Type Coefficient
R1
R2
R7
R9
K
39.2 µV/°C
110
Ω 5.76 kΩ 102 kΩ 269 kΩ
J
50.2 µV/°C
100
Ω 4.02 kΩ 80.6 kΩ 200 kΩ
S
10.3 µV/°C
100
Ω 20.5 kΩ 392 kΩ 1.07 MΩ
Figure 25. Thermocouple Amplifier with Cold Junction
Compensation
PRECISION HIGH GAIN DIFFERENTIAL AMPLIFIER
The high gain, gain linearity, CMRR, and low TCVOS of the
OP177 make it possible to obtain performance not previously
available in single stage, very high-gain amplifier applications.
See Figure 26.
For best CMR,
R1
R2
must equal
R3
R4
. In this example, with a
10 mV differential signal, the maximum errors are as listed in
Table II.


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