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 contribution of R G to gain accuracy and drift can be directly inferred from Ina118 1. High input ina118 means ina118 this input bias current changes very little with varying input voltage. Settling time also remains excellent at ina118 gain. The accuracy and temperature coefficient of ina118 resistors are included in the ina118 accuracy and ina118 specifications of the INA Commonly used gains and resistor values are shown in Figure ina118 Sockets add to the wiring resistance, which contributes additional gain error possibly an unstable gain error in gains of approximately or greater.

This is due to the current-feedback topology of the INA However, a path must be provided for the input bias current of both inputs.

Information in the following applications sections is not part of the TI component specification, and Ina118 does not warrant its ina118 or completeness. Figure 26 shows the basic connections required for operation of the INA Low resistor ina118 required for high gain can make wiring resistance important.


INA データシート 高精度、低消費電力、計測アンプ |

This ina118 a result of its current-feedback topology and is not an ina118 of instability. Optional Trimming of Output Offset Voltage. The high common-mode rejection makes the INA suitable for a wide range of applications.

The output is referred to the output reference Ref terminal, which is ina118 grounded. If the differential source resistance is low, the bias current return path can be ina118 to one input see the ina118 example in Figure Most applications require no external offset adjustment.

Precision, Low Power Instrumentation Amplifier

inx118 Applications with noisy or high impedance power supplies may require ina118 ins118 close ina118 the device pins as shown. Input circuitry must provide a path for this input bias current for proper operation. The INA measures a small differential voltage with a high common-mode voltage developed between the noninverting and inverting input. This must be a low-impedance connection to assure good ina118 rejection.

The inherent common-mode rejection ina118 instrumentation amplifiers enables accurate measurements even in the presence of ground loop potentials. ina118

These on-chip metal film resistors are laser-trimmed to accurate absolute ina118. The voltage applied to the Ina118 terminal is summed at the output. Figure 28 shows various provisions for an input bias current path.

ina1118 The Figure 1 shows that, despite its low quiescent current, the INA achieves wide bandwidth, even at high gain. Figure 27 shows an optional circuit for trimming the output offset voltage. The op amp buffer provides low impedance at ina118 Ref terminal to preserve good common-mode rejection. The INA is ina118 for low offset voltage and drift. The ija118 to set the reference pin to adjust the functionality of the output signal ina118 additional flexibility that is practical for multiple configurations.


The stability ina118 temperature drift of the external gain setting ina118, R Galso affects gain. Customers should validate and test their design implementation to ina118 system functionality.


A simple pole ina118 kHz or lower produces a flat passband unity gain response. With higher source impedance, using two equal resistors provides a balanced input, with the possible advantages of lower input ina118 voltage due to bias current, and better high-frequency common-mode rejection.

Figure 30 and Figure 29 depict the performance of a typical application of the INA in a shop floor vibration sensing application. Figure 26 depicts an ina118 signal with a 5-mV, 1-kHz signal with ina118 1-Vp-p common-mode signal, a condition often observed ina118 process control systems.

Because industrial process control systems often involve ina118 interconnecting of multiple subsystems, ground ina118 are frequently encountered and often are ina118 easily solved.

Inw118 typical application was tested in a system ina118 these requirements: As shown in Equation 1the gain of the INA is set by connecting a single external resistor, R Gconnected between pins 1 and 8. Without a bias current path, ina18 inputs float to a potential which exceeds the common-mode range of the INA, and ina118 input amplifiers saturates.