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INA122U

Name: INA122U
Rating: 4.7 (12 reviews)

IC INST AMP 1 CIRCUIT 8SOIC

製造商
製造商。部分 #INA122U
包 8-SOIC (0.154, 3.90mm Width)
資料表 INA122U DataSheet
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規格

Supplier	Texas Instruments
Package	Tube
ProductStatus	Active
AmplifierType	Instrumentation
NumberofCircuits	1
SlewRate	0.16V/µs
-3dbBandwidth	120 kHz
Current-InputBias	10 nA
Voltage-InputOffset	100 µV
Current-Supply	60µA
Current-Output/Channel	30 mA
Voltage-SupplySpan(Min)	2.2 V
Voltage-SupplySpan(Max)	36 V
OperatingTemperature	-40°C ~ 85°C
MountingType	Surface Mount
Package/Case	8-SOIC (0.154, 3.90mm Width)

概述

Description

INA122U is a Texas Instruments instrumentation amplifier optimized for amplifying small differential signals from sensors with high input impedance and good common-mode rejection. It uses a 3-op-amp architecture, with:
- an external RG to set gain over a wide range,
- a reference pin to shift the output (useful for single-supply operation),
- supports single- or dual-supply operation,
- low offset and low input bias current for precise measurements.
Common applications include bridge sensors, strain gauges, thermocouples, and biomedical signals where small differential voltages must be extracted from noisy environments. The “U” suffix denotes a specific packaging option; check the datasheet for exact package types and precise electrical specs (supply range, gain range, input/output ranges) for INA122U.

Features

INA122U is a precision instrumentation amplifier. Key features:
- Differential input with very high input impedance
- Gain set externally with RG (adjustable gain)
- REF pin to shift the output level for easy offset control
- Suitable for single-supply or dual-supply operation
- Low input bias current, low offset voltage and drift
- High common-mode rejection ratio (CMRR) and good PSRR
- Low-noise performance with fast settling
- Robust input protection and overload tolerance
- Small package options (e.g., MSOP/8-pin) for compact designs
- Available in commercial/industrial temperature ranges
Typical applications: bridge sensors, shunt-current measurement, thermocouples/RTDs, medical/portable sensor front-ends, and precision data acquisition front-ends.

Package

INA122U comes in an 8-pin plastic DIP (DIP-8) package.

Pinout

INA122U is an 8‑pin instrumentation amplifier.
Pin functions (typical 8‑pin package):
- Pins 1 and 8: RG – gain-setting terminals. A resistor between pins 1 and 8 sets the gain.
- Pin 2: −IN (inverting input)
- Pin 3: +IN (non-inverting input)
- Pin 4: −Vs (negative supply)
- Pin 5: REF (reference/output offset adjustment)
- Pin 6: OUTPUT (amplified signal)
- Pin 7: +Vs (positive supply)
In short: 8 pins total; inputs on 2 and 3, output on 6, supply rails on 4 and 7, reference on 5, and gain set by a resistor between pins 1 and 8.

Manufacturer

- Manufacturer: Texas Instruments (TI).
- What kind of company: American multinational corporation that designs and manufactures semiconductors and integrated circuits, specializing in analog and mixed-signal ICs; one of the world’s largest semiconductor companies, headquartered in Dallas, Texas.

Application

Applications of INA122U:
- Bridge-sensor conditioning (strain gauges, load cells)
- Low-level sensors (thermocouples, RTDs) and other small differential signals
- Current sensing with shunt resistors
- Medical/biomedical front-ends (ECG/EMG/EEG) and portable devices
- Data-acquisition front-ends and sensor interfaces
- Industrial automation requiring low-noise differential amplification

Equivalent

Equivalent parts to the INA122U (low‑power IA with RG gain) include:
- Analog Devices: AD623, AD8220, AD8226
- Maxim Integrated: MAX4238, MAX4239
- TI legacy: INA126, INA118
These are similar instrumentation amplifiers with RG-set gains and single‑supply operation. Check exact gain range, bandwidth, input/output limits, and package/pinout for true cross‑reference.