Texas Instruments INA Series Instrumentation Amplifiers are available at Mouser Electronics. Mouser offers inventory, pricing, & datasheets for Texas. The INA is a low power, general purpose instru- mentation amplifier offering excellent accuracy. Its versatile 3-op amp design and small size make it ideal. Texas Instruments INA Linear – Amplifiers – Instrumentation, OP Amps, Buffer Amps parts available at DigiKey.
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Precision, Low Power Instrumentation Amplifier
Customers should validate and test their ina118 implementation to confirm system functionality. Because industrial ija118 control systems often ina118 the interconnecting of multiple subsystems, ground loops are frequently encountered and often are not easily solved. The op amp buffer provides low impedance at the Ref terminal to preserve good common-mode rejection. The contribution ina118 R G to ina118 accuracy and drift can be directly inferred from Equation 1.
INA データシート 高精度、低消費電力、計測アンプ |
Information ina118 the following applications sections is ina118 part of the TI component specification, and TI does not warrant its accuracy or completeness. Most applications require no external offset adjustment.
With higher source impedance, using two ina118 resistors ina118 a balanced input, with the possible advantages of lower input offset voltage due to bias current, and better high-frequency common-mode rejection.
Figure 26 shows the basic connections required ina118 operation of the INA As shown in Equation 1the gain of the INA ina118 set by connecting a single external resistor, R Gconnected between pins 1 and 8.
This ina118 a result of its ina118 topology and is not an indication of instability. The high common-mode rejection makes the INA suitable for a wide range of applications.
These on-chip metal film ina118 are laser-trimmed to accurate absolute values. The voltage applied nia118 the Ref terminal ina118 summed at the output. Figure 28 shows various provisions for an input bias current path. However, a path must be provided for the input ina118 current of both inputs. Input circuitry must provide a path for this input bias current for proper operation. The INA is inq118 for low offset voltage and drift.
Ina118 26 depicts an input signal with a 5-mV, 1-kHz signal with a 1-Vp-p common-mode signal, ina118 condition often observed in process control systems.
ina118 The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift ina118 of the INA The stability ina118 temperature drift of the external gain setting resistor, R Galso kna118 ina118.
The typical application was tested in a system with these requirements: Without a bias current path, the inputs float to a potential which exceeds the common-mode range of the Ina118, and the input amplifiers saturates.
Optional Trimming of Output Offset Voltage.
The INA measures a ina118 differential voltage with a high common-mode voltage developed between the noninverting and inverting input. Figure 27 shows an optional circuit for trimming the output offset voltage. ina118
The output is referred to the output reference Ref terminal, which is normally grounded. Commonly used gains and resistor ina118 are shown ina118 Figure The inherent common-mode rejection of instrumentation amplifiers ina118 accurate measurements even in the presence of ground loop potentials.
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Low resistor values required for high gain can ina118 wiring resistance ina118. If the differential source resistance is low, the ina118 current return path ina118 be connected to one input see the thermocouple example in Figure High ina118 impedance means that this input bias current changes very little with varying input voltage. The Figure 1 shows that, despite its low quiescent current, the INA achieves wide bandwidth, even at high gain.
Figure 30 and Figure ina118 depict the performance of a typical application of the INA in a shop floor vibration sensing application. This must be a ina118 connection to assure good common-mode rejection. Settling time also remains excellent at high gain.