INA828 Texas Instruments Integrated Circuit (Small Outline Packages) In Stock
The INA828 is a precision instrumentation amplifier from Texas Instruments with 7 nV/Hz input voltage noise density and 50 V common-mode input voltage range. It operates from a single 2.7 V to 36 V supply or dual supplies and offers gain set by a single external resistor from 1 V/V to 10,000 V/V. Available in small-outline packages with worldwide distribution.
- Manufacturer
- Texas Instruments
- Package
- Small Outline Packages
- Pin Count
- 8
- Lifecycle
- ACTIVE
- Datasheet
- INA828 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Ultra-low 7 nV/Hz voltage noise density enables high-resolution signal conditioning in medical and precision measurement designs
- 50 V common-mode input voltage range allows direct connection to high-side current shunts and industrial sensor bridges
- Gain adjustable from 1 V/V to 10,000 V/V with a single external resistor, eliminating matched resistor networks
- Wide single-supply range 2.7 V to 36 V supports both low-voltage portable and high-voltage industrial applications
Applications
The INA828 is ideal for precision signal conditioning of low-level signals from strain gauges, thermocouples, pressure bridges, and load cells where input voltage noise below 10 nV/Hz and high common-mode rejection are required. It is used in medical instrumentation such as ECG and electrophysiology amplifiers where 50 V common-mode tolerance protects against patient defibrillation transients while preserving sub-millivolt signal fidelity. Industrial process control systems and data acquisition front-ends also use the INA828 for 4 mA to 20 mA current loop signal conditioning with gain settings up to 10,000 V/V.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Frequently Asked Questions
What is the input referred voltage noise of INA828 and how does it affect resolution in a strain gauge bridge application?
The INA828 achieves 7 nV per root hertz input-referred voltage noise, which at a 1 kHz measurement bandwidth produces approximately 221 nV RMS noise floor. For a full-scale 10 mV bridge output amplified to a 5 V ADC range using a gain of 500 V/V, this translates to a dynamic range exceeding 17 bits, making the INA828 suitable for precision weighing and structural monitoring applications without additional filtering stages.
How does the 50 V common-mode input range of INA828 benefit high-side current sensing in 24 V industrial systems?
In a 24 V industrial power supply with a high-side shunt resistor, the common-mode voltage at the instrumentation amplifier inputs is approximately 24 V during normal operation but can spike to 40 V or higher during load transients. The INA828's 50 V common-mode input range tolerates these transients without saturation or damage, while its common-mode rejection ratio of 100 dB at G = 100 V/V suppresses the 24 V rail from appearing at the output. This eliminates the need for a voltage divider that would attenuate the small differential shunt signal.
What gain range does INA828 support, and how is the gain set compared to older in-amp designs requiring matched resistor quads?
The INA828 supports gains from 1 V/V to 10,000 V/V set by a single external resistor according to the formula G = 1 + (80 kOhm / R_G). For example, R_G = 8.87 Ohm sets G = 10,000 V/V, while R_G = 80 kOhm sets G = 2 V/V. This single-resistor approach eliminates the matching errors of discrete resistor networks used in older three-op-amp in-amp topologies, reducing gain error to less than 0.05% and simplifying PCB layout significantly.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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