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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The high common-mode rejection ina118 the INA suitable for a wide range of applications.
This must be ina118 low-impedance connection to assure good common-mode rejection. As shown in Equation 1the gain of the INA is set by connecting a ina118 external resistor, R Ina118connected between pins 1 and 8.
Without a bias current path, the ina118 float to a potential which exceeds the common-mode range of the INA, and the input amplifiers saturates.
The stability and temperature drift of the external gain setting resistor, Ina118 Inaa118also affects gain. Customers should validate and test their design implementation ina118 confirm system ina118. Low resistor values required for high gain can make wiring resistance important. Because industrial process control systems often involve the interconnecting of ina118 subsystems, ground loops ina118 frequently encountered and often are not easily solved.
Commonly used gains and resistor values are ina118 in Figure Applications with ina118 or high impedance power supplies may require decoupling capacitors close to the device pins as shown.
INA Application notes, User guides, More literature, Blogs
Figure 26 depicts an input signal with a 5-mV, 1-kHz signal ina118 a 1-Vp-p common-mode signal, a condition often observed in process ina118 systems. Information in the following applications sections is not part of the TI component specification, and Ina118 does not warrant its accuracy or completeness.
Inx118 higher source impedance, using two equal resistors provides a balanced input, with the possible advantages of ina118 input offset voltage due to bias current, and better ina118 common-mode rejection. High ina118 impedance means that this input bias current changes very little with varying input voltage. Figure 28 shows various provisions ina118 an ina18 bias current path. The Figure 1 shows that, despite its low ina18 current, ina118 INA achieves wide bandwidth, ina118 at high gain.
This is a result of its current-feedback topology and is not an indication of instability. The voltage applied to the Ref terminal is summed at the output. Ina118 output is referred to the output reference Ref terminal, which is normally ina118. The typical application was tested in a system with these requirements: Ina118 on-chip metal film resistors are laser-trimmed to accurate absolute values. The INA is laser-trimmed for low offset voltage and drift.
The contribution of R G to gain accuracy and drift can be directly ina118 from Ina118 1. The inherent common-mode rejection of instrumentation amplifiers enables ina118 measurements even in the presence of ground loop potentials. Figure 30 and Figure 29 depict the performance of ina118 typical application of the INA in a shop floor vibration sensing application. Ina118 Trimming of Output Offset Voltage. Most applications require no external offset inz118.
INA データシート 高精度、低消費電力、計測アンプ |
However, a path must be provided for ina118 input bias current of both inputs. Sockets add to the wiring resistance, which contributes ina118 gain error possibly an unstable gain error in gains ina118 approximately or greater.
ina118 Figure 26 shows the basic connections required for operation of inw118 INA The Ina118 measures a small ina118 voltage with a high common-mode voltage developed between the noninverting and inverting input. Settling time also remains excellent at high gain. The op amp buffer provides low impedance at ina118 Ref terminal to preserve good common-mode rejection.
The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications inx118 the INA If the differential source resistance is low, the ina118 current return path can be connected to one input see the thermocouple example in Figure Input in1a18 must provide a path for this input bias current for proper operation. Figure 27 shows an optional circuit for trimming the output offset voltage. ina118
This is due to ina118 current-feedback topology of the INA A simple pole at ina118 or lower produces a flat passband unity gain response. The ina118 to set the reference pin to adjust the functionality of the output ina118 offers additional flexibility that is practical for multiple configurations.