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| 型号： | OP1177ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP 1.3MHZ PREC LN 8MSOP |
| 产品培训模块： | Power Line Monitoring Top Five Instrumentation Amplifier Problems |
| 设计资源： | Versatile High Precision Programmable Current Sources Using DACs, Op Amps, and MOSFET Transistors (CN0151) How to Achieve High Precision Voltage Level Setting Using AD5541A/42A (CN0169) |
| 标准包装： | 1,000 |
| 放大器类型： | 通用 |
| 电路数： | 1 |
| 转换速率： | 0.7 V/µs |
| 增益带宽积： | 1.3MHz |
| 电流 - 输入偏压： | 500pA |
| 电压 - 输入偏移： | 15µV |
| 电流 - 电源： | 400µA |
| 电流 - 输出 / 通道： | 10mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 36 V，±2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
OP1177/OP2177/OP4177
Rev. G | Page 19 of 24
Plugging these values into Equation 1 yields
δ
2
1
MIN
CMRR
where δ is the tolerance of the resistors.
Lower tolerance value resistors result in higher common-mode
rejection (up to the CMRR of the operational amplifier).
Using 5% tolerance resistors, the highest CMRR that can be
guaranteed is 20 dB. Alternatively, using 0.1% tolerance resistors
results in a common-mode rejection ratio of at least 54 dB
(assuming that the operational amplifier CMRR × 54 dB).
With the CMRR of OPx177 at 120 dB minimum, the resistor
match is the limiting factor in most circuits. A trimming resistor
can be used to further improve resistor matching and CMRR of
the difference amplifier circuit.
A HIGH ACCURACY THERMOCOUPLE AMPLIFIER
A thermocouple consists of two dissimilar metal wires placed in
contact. The dissimilar metals produce a voltage
VTC = α(TJ TR)
where:
TJ is the temperature at the measurement of the hot junction.
TR is the temperature at the cold junction.
α is the Seebeck coefficient specific to the dissimilar metals used
in the thermocouple.
VTC is the thermocouple voltage and becomes larger with
increasing temperature.
Maximum measurement accuracy requires cold junction compen-
sation of the thermocouple. To perform the cold junction compen-
sation, apply a copper wire short across the terminating junctions
(inside the isothermal block) simulating a 0°C point. Adjust the
output voltage to zero using the R5 trimming resistor, and remove
the copper wire.
The OPx177 is an ideal amplifier for thermocouple circuits
because it has a very low offset voltage, excellent PSRR and
CMRR, and low noise at low frequencies.
It can be used to create a thermocouple circuit with great
linearity. Resistor R1, Resistor R2, and Diode D1, shown in
Figure 64, are mounted in an isothermal block.
V+
7
4
Cu
TR
D1
ADR293
VCC
C1
2.2F
R3
47k
10F
R2
4.02k
R8
1k
R7
80.6k
R6
50
R9
200k
0.1F
10F
0.1F
10F
V–
10F
R4
50
R5
100
R1
50
ISOTHERMAL
BLOCK
VTC
TJ
(–)
(+)
6
2
3
OP1177
VOUT
0262
7-
064
Figure 64. Type K Thermocouple Amplifier Circuit
LOW POWER LINEARIZED RTD
A common application for a single element varying bridge is an
RTD thermometer amplifier, as shown in Figure 65. The excita-
tion is delivered to the bridge by a 2.5 V reference applied at the
top of the bridge.
RTDs may have thermal resistance as high as 0.5°C to 0.8°C
per mW. To minimize errors due to resistor drift, the current
through each leg of the bridge must be kept low. In this circuit,
the amplifier supply current flows through the bridge. However,
at the OPx177 maximum supply current of 600 μA, the RTD
dissipates less than 0.1 mW of power, even at the highest resis-
tance. Errors due to power dissipation in the bridge are kept
under 0.1°C.
Calibration of the bridge is made at the minimum value of
temperature to be measured by adjusting RP until the output is zero.
To calibrate the output span, set the full-scale and linearity
potentiometers to midpoint and apply a 500°C temperature to
the sensor or substitute the equivalent 500°C RTD resistance.
Adjust the full-scale potentiometer for a 5 V output. Finally,
apply 250°C or the equivalent RTD resistance and adjust the
linearity potentiometer for 2.5 V output. The circuit achieves
better than ±0.5°C accuracy after adjustment.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| OP1177ARMZ-R71 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Low Noise, Low Input Bias Current Operational Amplifiers |
| OP1177ARMZ-REEL | 功能描述:IC OPAMP GP 1.3MHZ PREC LN 8MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 产品培训模块:Differential Circuit Design Techniques for Communication Applications 标准包装:1 系列:- 放大器类型:RF/IF 差分 电路数:1 输出类型:差分 转换速率:9800 V/µs 增益带宽积:- -3db带宽:2.9GHz 电流 - 输入偏压:3µA 电压 - 输入偏移:- 电流 - 电源:40mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):3 V ~ 3.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:16-VQFN 裸露焊盘，CSP 供应商设备封装:16-LFCSP-VQ 包装:剪切带 (CT) 产品目录页面:551 (CN2011-ZH PDF) 其它名称:ADL5561ACPZ-R7CT |
| OP1177ARMZ-REEL1 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Low Noise, Low Input Bias Current Operational Amplifiers |
| OP1177AR-REEL | 制造商:Analog Devices 功能描述:OP Amp Single GP ±15V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE, PRECISION LOW NOISE OP AMP - Tape and Reel |
| OP1177AR-REEL7 | 制造商:Analog Devices 功能描述:OP Amp Single GP ±15V 8-Pin SOIC N T/R 制造商:Rochester Electronics LLC 功能描述:SINGLE, PRECISION LOW NOISE OP AMP - Tape and Reel |
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