参数资料
| 型号： | OP177GS |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/16页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP PREC LN 8SOIC |
| 产品变化通告： | OP07, OP177 Redesign Change 19/Jul/2011 |
| 设计资源： | AD7266 SAR ADC in DC-Coupled Differential and Single-Ended Appls (CN0039) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7352 (CN0040) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7356 (CN0041) AD7265 in Differential and Single-Ended Configurations Using AD8022 (CN0048) Unipolar, Precision DC Digital-to-Analog Conversion using AD5450/1/2/3 8-14-Bit DACs (CN0052) DC-Coupled, Single-Ended-to-Differential Conversion Using AD8138 and AD7357 (CN0061) |
| 标准包装： | 98 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 转换速率： | 0.3 V/µs |
| 增益带宽积： | 600kHz |
| 电流 - 输入偏压： | 1.2nA |
| 电压 - 输入偏移： | 20µV |
| 电流 - 电源： | 1.6mA |
| 电压 - 电源，单路/双路(±)： | 6 V ~ 36 V，±3 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
Data Sheet
OP177
Rev. G | Page 9 of 16
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 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 24 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 25 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 26 is a simple open-loop gain test circuit.
AVO ≥ 650V/mV
RL = 2k
VX
–10V
0V
+10V
00289-
023
Figure 24. Typical Precision Op Amp
VY
VX
–10V
0V
+10V
00289-
024
AVO ≥ 12000V/mV
RL = 2k
Figure 25. Output Gain Linearity Trace
–
+
VY
VX
10k
1M
10
RL
VIN = ±10V
OP177
00289-
025
Figure 26. 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
5.76 k
102 k
269 k
J
50.2 μV/°C
100
4.02 k
80.6 k
200 k
S
10.3 μV/°C
100
20.5 k
392 k
1.07 M
VOUT
–15V
10F
0.1F
+15V
10F
0.1F
R4
50
1%
R5
100
(ZERO
ADJUST-
MENT)
ANALOG
GROUND
ANALOG
GROUND
10F
R8
1.0k
0.05%
+
10F
COPPER
ISOTHERMAL
BLOCK
COLD-JUNCTION
COMPENSATION
REF01
2.2F
+
+15V
6
4
2
10.000V
–
+
TYPES
ISOTHERMAL
COLD-
JUNCTIONS
–
+
OP177
R1
100
1%
R2
20.5k
1%
R3
47k
1%
R7
392k
1%
R9
1.07M
0.05%
00289-
026
Figure 27. Thermocouple Amplifier with Cold Junction Compensation
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