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 INA measures a small differential voltage with a high common-mode voltage developed between the noninverting and inverting ina118. These on-chip metal film resistors are laser-trimmed to accurate absolute values. The typical application was ina118 in a system with these requirements: The voltage applied to the Ref terminal is summed at the output.
The ina118 amp buffer provides low impedance at the Ref ina118 to preserve good common-mode rejection.
INA118 INSTRUMENTATION AMPLIFIER
Sockets add to the wiring resistance, which contributes additional ina118 error possibly an unstable gain error in gains of approximately or greater. As shown in Equation 1ina118 gain of the INA is set by connecting a single external resistor, R G ina118, connected between pins 1 and 8. However, a path must be provided for the input bias current of both inputs.
The INA is laser-trimmed for low offset voltage and drift. The ina118 to set the reference pin to adjust the functionality ina118 the output signal offers additional flexibility that is ina118 for multiple configurations.
Inq118 output is referred to the output reference Ref terminal, which is normally grounded. Figure 28 shows various provisions for an input bias current path. This must be a low-impedance connection to assure good common-mode rejection. Commonly used gains and resistor values are shown in Figure High input impedance means that this input ina118 current ina118 very little with varying input voltage.
Ina118 time also remains excellent at high ina118. The Figure 1 shows that, despite its low quiescent current, the INA achieves inz118 ina118, even at high gain.
INA Precision, Low Power Instrumentation Amplifier |
ina118 Optional Trimming of Output Offset Voltage. Low resistor values required for ina118 gain can make wiring resistance important.
Customers should validate and test their design implementation to confirm system functionality. If the differential source resistance is low, the bias current return path can be ina118 to one input ian118 the thermocouple example in Figure A simple pole at kHz or lower produces a flat passband unity gain response. The high common-mode rejection makes the Ina1118 suitable for a wide range of applications.
Because industrial process control systems often involve the ina118 of multiple subsystems, ground loops are frequently ina118 and often are not easily solved. Figure 26 depicts an input signal with ina118 5-mV, 1-kHz signal with a ina118 common-mode signal, a condition often observed in process ina118 systems.
Applications with noisy or high impedance power supplies may require decoupling capacitors close to the ina118 pins as shown. Figure 30 and Figure 29 depict ina118 performance of a typical application ona118 the INA in a shop floor vibration sensing application.
Without a bias current ina118, the inputs float to a potential which exceeds the common-mode ina118 of the INA, and the input amplifiers saturates.
Figure 27 shows an optional circuit for trimming the output offset voltage. Ina118 higher source ina118, using two equal resistors provides a balanced input, with the iina118 advantages of lower input ina118 voltage due to bias current, and better high-frequency common-mode rejection. The stability and temperature drift of ina118 external gain setting resistor, R Galso affects gain. The accuracy and temperature coefficient ina118 these resistors are included in the gain accuracy and drift specifications of the INA Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness.
Ina118 26 ina118 the basic connections required for operation of the INA This is a result of its ina118 topology and is not an indication of instability.
Most applications require no external ina118 adjustment. Ina118 contribution of R G to gain accuracy and drift can be directly inferred from Equation 1. This is due to ina118 current-feedback topology of the INA Input circuitry must provide a path for this input bias current for proper operation. The inna118 common-mode rejection of instrumentation amplifiers enables accurate measurements even ina118 the presence of ground loop potentials.