Precision, Low Drift, CMOS Instrumentation Amplifier
Product details
Parameters
Package | Pins | Size
Features
- PRECISION
LOW OFFSET: 100 µV (max)
LOW OFFSET DRIFT: 0.4 µV/°C (max)
EXCELLENT LONG-TERM STABILITY
VERY-LOW 1/f NOISE - TRUE RAIL-TO-RAIL I/O
INPUT COMMON-MODE RANGE:
20mV Below Negative Rail to 100mV Above Positive Rail
WIDE OUTPUT SWING: Within 10mV of Rails
SUPPLY RANGE: Single +2.7V to +5.5V - SMALL SIZE
microPACKAGE: MSOP-8, MSOP-10 - LOW COST
- APPLICATIONS
- LOW-LEVEL TRANSDUCER AMPLIFIER FOR BRIDGES, LOAD CELLS, THERMOCOUPLES
- WIDE DYNAMIC RANGE SENSOR MEASUREMENTS
- HIGH-RESOLUTION TEST SYSTEMS
- WEIGH SCALES
- MULTI-CHANNEL DATA ACQUISITION SYSTEMS
- MEDICAL INSTRUMENTATION
- GENERAL-PURPOSE
Description
The INA326 and INA327 (with shutdown) are high-performance, low-cost, precision instrumentation amplifiers with rail-to-rail input and output. They are true single-supply instrumentation amplifiers with very low DC errors and input common-mode ranges that extends beyond the positive and negative rails. These features make them suitable for applications ranging from general-purpose to high-accuracy.
Excellent long-term stability and very low 1/f noise assure low offset voltage and drift throughout the life of the product.
The INA326 (without shutdown) comes in the MSOP-8 package. The INA327 (with shutdown) is offered in an MSOP-10. Both are specified over the industrial temperature range, –40°C to +85°C, with operation from –40°C to +125°C.
Technical documentation
= Top documentation for this product selected by TI
| Type | Title | Date | |
|---|---|---|---|
| * | Datasheet | INA326, 327: Precision, Rail-To-Rail I/O Instrumentation Amplifier datasheet (Rev. D) | Nov. 03, 2004 |
| Technical articles | What is an instrumentation amplifier? | Aug. 09, 2019 | |
| Application note | 3-decade, load-current sensing circuit (Rev. A) | Feb. 01, 2019 | |
| Application note | Low-level voltage-to-current converter circuit | Jan. 09, 2019 | |
| E-book | The Signal e-book: A compendium of blog posts on op amp design topics | Mar. 28, 2017 | |
| Technical articles | How to layout a PCB for an instrumentation amplifier | Oct. 14, 2016 | |
| Technical articles | Dealing with rejection: Instrumentation amplifier PSRR and CMRR (Part I) | Nov. 25, 2013 | |
| Application note | A dual-polarity, bidirectional current-shunt monitor | Oct. 22, 2008 | |
| Application note | Q4 2008 Issue Analog Applications Journal | Oct. 22, 2008 | |
| Application note | Low-Cost Noise-Immune Isolated Thermocouple Signal Processor | Jan. 08, 2007 | |
| Application note | Getting the most out of your instrumentation amplifier design | Oct. 10, 2005 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
PLABS-SAR-EVM-PDK is an experimental platform used in conjunction with TI Precision Labs videos to gain a deeper understanding of successive approximation register (SAR) analog-to-digital converter (ADC) circuits. The evaluation module (EVM) platform contains two channels for common SAR (...)
Features
- Intuitive setup – PCB overlay shows the schematic
- No external power supply required
- Includes several coupon boards with different driving amplifier RC filters to facilitate experimentation
- Ships with PHI controller - provides convenient interface to EVM over USB 2.0 (or higher) for power delivery (...)
Design tools & simulation
SBOC169B.TSC (119 KB) - TINA-TI Reference Design
SBOC170B.TSC (129 KB) - TINA-TI Reference Design
SBOM150A.ZIP (108 KB) - PSpice Model
SBOM248A.ZIP (10 KB) - TINA-TI Spice Model
SBOM249A.ZIP (9 KB) - TINA-TI Spice Model
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
TINA-TI — TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
ANALOG-ENGINEER-CALC — The Analog Engineer’s Calculator is designed to speed up many of the repetitive calculations that analog circuit design engineers use on a regular basis. This PC-based tool provides a graphical interface with a list of various common calculations ranging from setting op-amp gain with feedback (...)
Features
- Expedites circuit design with analog-to-digital converters (ADCs) and digital-to-analog converters (DACs)
- Noise calculations
- Common unit translation
- Solves common amplifier circuit design problems
- Gain selections using standard resistors
- Filter configurations
- Total noise for common amplifier configurations
- (...)
INA-CMV-CALC — The Common-Mode Input Range Calculator is tool for quickly generating plots of an instrumentation amplifier’s common-mode input range vs output. The tool is compatible with both 2-amp and 3-amp instrumentation amplifiers utilizing any supply range.
The Common-Mode Input Range Calculator is pre-loaded (...)
Features
- Preloaded with 20 of TI’s most popular instrumentation amplifier specifications
- Customizable supply, gain, and voltage reference options
- Calculator displays output limitations graphically and numerically
SBOC498.ZIP (28 KB)
Reference designs
TIPD193 — This reference design translates resistance temperature detectors (RTD) resistance to a voltage level convenient for an ADC input. A precision current reference provides excitation and an instrumentation amplifier scales the signal. The design also uses a three wire RTD configuration to minimize (...)
Design files
-
download TIPD193 BOM.pdf (203KB)
TIPD107 — This Verified Design is a micro-Amp voltage-to-current (V-I) converter circuit that delivers a precise low level current to a load. The design operates on a single 5V supply and uses a precision low drift op-amp, and instrumentation amplifier. Simple modification can change the range and accuracy of (...)
Design files
-
download TIPD107 Gerber.zip (161KB) -
download TIPD107 BOM (Rev. A).pdf (185KB)
TIPD104 — This TI Reference Design provides the theory, component selection, and simulation of a single-supply, precision low-side current sensing solution that can accurately detect load currents from 10uA-10mA. The corresponding linear output is from 100mV to 4.9V. While traditional op amps can be used for (...)
Design files
-
download TIPD104 BOM.pdf (186KB)
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| VSSOP (DGK) | 8 | View options |
Ordering & quality
Information included:
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- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
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