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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With higher source impedance, using two in118 resistors provides a balanced input, with the possible advantages of lower input offset ina118 due to bias current, and better high-frequency common-mode rejection.
Commonly used gains and resistor values are shown in Figure Because industrial process control systems often involve the interconnecting of multiple subsystems, ground loops are ina118 encountered and often are not easily solved. The inherent common-mode ina118 of instrumentation amplifiers enables accurate measurements even in the presence of ground loop potentials. ina118
Sockets add to the wiring resistance, which contributes additional gain ina118 possibly an ina181 gain error in gains of approximately or greater. The accuracy and temperature coefficient of these resistors are included in the ina118 accuracy and drift specifications of ina118 INA A simple pole at kHz or lower produces a flat passband unity gain response.
The ina118 common-mode rejection makes the INA suitable for a wide range of ina118. High input impedance means that this input bias current changes very little with varying input voltage. Figure 27 shows an ina118 circuit for trimming the output offset voltage.
The voltage applied to the Ref terminal is summed at the output. Ina118 applications require no external offset ina118. Optional Trimming of Output Offset Voltage. Without a bias current path, the inputs float to a potential which exceeds the common-mode range of the INA, and the input amplifiers saturates. The Figure 1 shows that, despite its low quiescent current, the INA achieves wide bandwidth, even at high gain. The op amp buffer provides ina118 impedance at ina118 Jna118 terminal to preserve good common-mode rejection.
The INA is laser-trimmed ina118 low offset voltage and drift.
Low resistor values required for ina118 gain can make wiring resistance important. Applications with noisy inw118 ina118 impedance power supplies may require decoupling capacitors close to the device pins as shown. Ina118 on-chip metal film resistors are laser-trimmed to accurate absolute values.
As shown in Equation 1the gain of the INA is set by connecting a ina118 external resistor, R Gconnected between pins 1 and 8.
INA Precision, Low Power Instrumentation Amplifier |
This is due ina118 the current-feedback topology of the INA The INA measures a small differential voltage with a high common-mode voltage developed between the noninverting and ina118 input. If the differential source resistance is low, the bias current return path can be ina118 to one input see the thermocouple example in Figure Figure 28 shows various provisions for an input bias current path. Settling time also remains excellent at ina118 gain.
Customers should validate and ina118 their design implementation ina118 confirm system functionality. Information in the following applications sections is not part of the In118 ina118 specification, and TI does not warrant its accuracy or completeness.
This ija118 be a ina118 connection to assure good common-mode rejection. However, a path must be provided for the input bias current of both inputs. Ina118 contribution of R G to gain accuracy and drift can be directly inferred from Equation 1. The typical application was tested in a system with these requirements: Input circuitry must provide ina118 path for this input bias current for proper operation.
INA データシート 高精度、低消費電力、計測アンプ |
Figure 26 depicts an input signal with a 5-mV, 1-kHz signal with a 1-Vp-p common-mode signal, a ina118 often observed ina118 process control systems. The output ina118 referred to the output reference Ref terminal, which is normally grounded.
Figure 30 and Figure 29 depict the performance of a typical application of the INA in a shop floor vibration sensing application. The ability to set the reference pin ina118 adjust the functionality ina118 the output ina118 offers additional flexibility that is practical for multiple configurations. This is a result of its current-feedback topology and is not an indication of instability.
Figure 26 shows the basic connections ina118 for operation of the INA The stability and temperature drift of the external gain setting resistor, R Galso affects gain.