INA121UA

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Instrumentation Amplifiers FET-Input Low Power Instrumentation Amp

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We have successfully obtained various certification standards and have established our own professional testing laboratory. This ensures that every product we supply to our customers meets the highest quality standards. We adhere to strict testing protocols to maintain the consistency and accuracy of our products. To ensure that our products are original and genuine, we also collaborate with reputable third-party testing facilities to conduct rigorous quality testing. Our commitment to quality extends to meeting industry, legal, regulatory, and ISO 9001:2015 requirements.

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Service & Packaging

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INA121UA DataSheet

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INA121UA Details

The INA121UA is a precision instrumentation amplifier from Texas Instruments, designed for reliable amplification of low-level signals in industrial and medical applications. This device features high common-mode rejection, low nonlinearity error, and wide bandwidth, making it suitable for strain gauge, pressure sensor, and transducer interfaces.

Pinout

  • V+: Positive Power Supply
  • V-: Negative Power Supply
  • GND: Ground
  • IN+: Non-inverting Input
  • IN-: Inverting Input
  • OUT+: Non-inverting Output
  • OUT-: Inverting Output

(Tip: For detailed pinout information, please refer to the corresponding datasheet.)

Key Features

  • Precision Instrumentation Amplifier: Provides high common-mode rejection and low nonlinearity error for precise signal amplification.
  • Wide Bandwidth: Offers a bandwidth of 700kHz for fast signal processing.
  • Low Input Offset Voltage: Features an input offset voltage of 100μV for accurate signal measurement.
  • Rail-to-Rail Output Swing: Provides a rail-to-rail output swing for maximum dynamic range and flexibility.

Applications

The INA121UA is suitable for various applications, including:

  • Strain Gauge Interfaces: Ideal for measuring strain gauge signals in industrial and medical applications.
  • Pressure Sensor Interfaces: Suitable for amplifying pressure sensor signals in industrial and medical applications.
  • Transducer Interfaces: Provides precise signal amplification for transducers used in industrial and medical applications.

Where to Use

The INA121UA is suitable for use in various environments, including:

  • Industrial Applications: Suitable for industrial applications requiring precise signal amplification.
  • Medical Applications: Ideal for medical applications where precision and accuracy are critical.

How to Use

To use the INA121UA, follow these steps:

  1. Connect the V+ and V- pins to a suitable power supply.
  2. Connect the IN+ and IN- pins to the input signal source.
  3. Connect the OUT+ and OUT- pins to the load or next stage amplifier.

(Tip: For detailed usage instructions, refer to the datasheet.)

Application Circuit

The application circuit diagram for the INA121UA illustrates how to connect the amplifier to a strain gauge or pressure sensor. It includes connections for power supply, ground, and input/output signals.

(Tip: For detailed circuit diagram connections and usage guide, refer to the datasheet.)

Equivalents

  • OPA227: A similar instrumentation amplifier from Texas Instruments offering comparable features and performance.
  • AD8221: An alternative instrumentation amplifier from Analog Devices with equivalent functionality.

Complementary

The INA121UA can be complemented by the INA125, which offers additional features such as higher gain and improved common-mode rejection ratio, suitable for more demanding applications.

(Tip: When selecting complementary amplifiers, ensure that their features and specifications align with your specific application requirements for optimal performance and compatibility.)

Frequently Asked Questions

Q: What is the maximum gain of the INA121UA?

A: The INA121UA has a maximum gain of 1000.

Q: Can the INA121UA be used in medical applications?

A: Yes, the INA121UA is suitable for use in medical applications where precision and accuracy are critical.

Specifications

The followings are basic parameters of the part selected concerning the characteristics of the part and categories it belongs to.

Number of channels 1 Vs (max) (V) 36
Vs (min) (V) 4.5 Input offset (±) (max) (µV) 500
Voltage gain (min) (V/V) 1 Voltage gain (max) (V/V) 10000
Noise at 1 kHz (typ) (nV√Hz) 20 Features Overvoltage protection
CMRR (min) (dB) 106 Input offset drift (±) (max) (V/°C) 0.000005
Input bias current (±) (max) (nA) 0.05 Iq (typ) (mA) 0.45
Bandwidth at min gain (typ) (MHz) 0.6 Gain error (±) (max) (%) 0.5
Operating temperature range (°C) -40 to 85 Rating Catalog
Type Resistor Gain nonlinearity (±) (max) (%) 0.005
Output swing headroom (to negative supply) (typ) (V) 0.15 Output swing headroom (to positive supply) (typ) (V) -0.9
Input common mode headroom (to negative supply) (typ) (V) 2 Input common mode headroom (to positive supply) (typ) (V) -2
Noise at 0.1 Hz to 10 Hz (typ) (µVPP) 1

Datasheet PDF

Datasheets record the features, absolute maximum ratings, applications and more of the device, which benefit a lot as an overall guide to the specific application of the part.

Preliminary Specification INA121UA PDF Download

FAQs

What is INA121UA?

The INA121UA is a precision instrumentation amplifier designed by Texas Instruments. It is specifically tailored for applications requiring accurate signal amplification, including sensor measurements, medical instrumentation, and industrial process control.

How Does INA121UA Work?

The INA121UA operates as an instrumentation amplifier, providing high-precision amplification of small differential signals. It includes precision-matched resistors to ensure low offset voltage and low drift for accurate signal conditioning. The device offers a high common-mode rejection ratio and is suitable for interfacing with low-level sensor signals.

How Many Pins does INA121UA have and What are the Functions of the Pinout Configuration?

The INA121UA is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package. The pinout configuration includes:

  • RG: Gain-set resistor pin.
  • V+: Positive power supply pin.
  • V-: Negative power supply pin.
  • REF: Reference voltage pin.
  • OUT: Output pin.
  • IN-: Inverting input pin.
  • IN+: Non-inverting input pin.
  • RG: Gain-set resistor pin.

What are the Pros and Cons of INA121UA?

Pros:

  • Precision Amplification: Provides high-precision signal amplification for accurate measurements.
  • High CMRR: Offers high common-mode rejection ratio, suitable for interfacing with low-level differential signals.
  • Low Offset Voltage: Precision-matched resistors ensure low offset voltage for accurate signal conditioning.
  • Wide Supply Voltage Range: Operates over a wide supply voltage range, offering flexibility in system design.

Cons:

  • External Components: May require external gain-setting resistors for specific gain configurations.
  • Cost: Precision instrumentation amplifiers may have a higher cost compared to general-purpose op-amps.

Are There Any Equivalents/Alternatives to INA121UA for Recommendation?

  • The INA122 from Texas Instruments is a similar precision instrumentation amplifier with a different pinout configuration.
  • Alternatives to the INA121UA include the AD8221 from Analog Devices and the LT1167 from Linear Technology.

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