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OP177GPZ 데이터시트(PDF) 9 Page - Analog Devices

부품명 OP177GPZ
상세설명  Ultraprecision Operational Amplifier
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OP177GPZ 데이터시트(HTML) 9 Page - Analog Devices

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OP177
Rev. E | Page 9 of 16
APPLICATION 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 specifica-
tion is only a part of the solution because all automated testers
use endpoint testing and, therefore, show only the average gain.
For example, Figure 23 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 non-
linear errors. An ideal op amp shows a horizontal scope trace.
Figure 24 shows the OP177 output gain linearity trace with its
truly impressive average AVO of 12,000 V/mV. The output trace
is virtually horizontal at all points, assuring extremely high gain
accuracy. Analog Devices also performs additional testing to
ensure consistent high open-loop gain at various output
voltages. Figure 25 is a simple open-loop gain test circuit.
AVO ≥ 650V/mV
RL = 2kΩ
VX
–10V
0V
+10V
Figure 23. Typical Precision Op Amp
VY
VX
–10V
0V
+10V
AVO ≥ 12000V/mV
RL = 2kΩ
Figure 24. Output Gain Linearity Trace
+
VY
VX
10kΩ
10kΩ
1MΩ
10Ω
RL
VIN = ±10V
OP177
Figure 25. Open-Loop Gain Linearity Test Circuit
THERMOCOUPLE AMPLIFIER WITH COLD-
JUNCTION COMPENSATION
An example of a precision circuit is a thermocouple amplifier
that must accurately amplify very low level signals without
introducing linearity and offset errors to the circuit. In this
circuit, an S-type thermocouple with a Seebeck coefficient of
10.3 μV/°C produces 10.3 mV of output voltage at a temperature
of 1000°C. The amplifier gain is set at 973.16, thus, it produces
an output voltage of 10.024 V. Extended temperature ranges
beyond 1500°C are 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
precise temperature sensing circuit. Circuit values for other
thermocouple types are listed in Table 5.
Table 5.
Thermocouple
Type
Seebeck
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
VOUT
–15V
10µF
0.1µF
+15V
10µF
0.1µF
R4
50Ω
1%
R5
100Ω
(ZERO
ADJUST-
MENT)
ANALOG
GROUND
ANALOG
GROUND
10µF
R8
1.0kΩ
0.05%
+
10µF
COPPER
COPPER
ISOTHERMAL
BLOCK
COLD-JUNCTION
COMPENSATION
REF01
2.2µF
+
+15V
6
4
2
10.000V
+
TYPES
ISOTHERMAL
COLD-
JUNCTIONS
+
OP177
R1
100Ω
1%
R2
20.5kΩ
1%
R3
47kΩ
1%
R7
392kΩ
1%
R9
1.07MΩ
0.05%
Figure 26. Thermocouple Amplifier with Cold Junction Compensation


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