INA781
85-V, 20-bit ultra-precise I²C-output digital power monitor with 400-µΩ EZShunt™ Technology
INA781
- Low loss integrated shunt resistor
- Internal resistance: 400 µΩ, T A = 25°C
- Continuous current: ±75 A, T A = 25°C
- Peak measurement capability: ±78.64 A
- Wide common-mode range: –0.1 V to +85 V
- High-resolution, 20-bit delta-sigma ADC
- Current monitoring accuracy:
- Offset current: ±5.5 mA, maximum
- Offset drift: ±25 µA/°C, maximum
- System gain error: ±0.5% at 50 A
- System gain error drift: ±25 PPM/°C, typical
- Common-mode rejection: ±100 µA/V, maximum
- Power monitoring accuracy:
- ±0.6% at 25°C, full scale
- Energy and charge accuracy:
- ±1.1% at 25°C, full scale
- Input bias current: 2.5 nA (maximum)
- Temperature sensor: ±1.5°C (maximum at 25°C)
- Programmable conversion time and averaging
- 2.94-MHz high-speed I 2C interface with 16 pin-selectable addresses
- Operates from a 2.7-V to 5.5-V supply:
- Operational current: 640 µA (typical)
- Shutdown current: 5 µA (maximum)
The INA781 is a digital power monitor with an integrated current sensing element along with a 20-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure full-scale currents up to ±78.64 A with common-mode voltage support from –0.1 V to +85 V.
The INA781 reports current, bus voltage, die temperature, power, energy and charge accumulation while employing a precision ±0.5% integrated oscillator, all while performing the needed calculations in the background. The integrated temperature sensor is ±2.5°C accurate over the junction temperature range.
The low offset and gain drift design of the INA781 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing.
The device allows for selectable ADC conversion times from 50 µs to 4.12 ms as well as sample averaging from 1x to 1024x, which further helps reduce the noise of the measured data.
Technical documentation
Type | Title | Date | ||
---|---|---|---|---|
* | Data sheet | INA781 85 V, 20-Bit, Ultra-Precise I2C Output Digital Power Monitor with EZShunt Technology datasheet | PDF | HTML | 06 Jul 2023 |
Technical article | Simplifying high-voltage sensing with Hall-effect current sensors | PDF | HTML | 05 Jan 2024 | |
Technical article | Bringing design simplicity, low drift, and small size to integrated-shunt solutions | PDF | HTML | 04 Jan 2024 | |
EVM User's guide | INA740-INA741EVM, INA745-INA746EVM, INA780-INA781EVM User's Guide (Rev. A) | PDF | HTML | 22 Dec 2023 | |
Certificate | INA781EVM EU Declaration of Conformity (DoC) | 19 May 2023 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
INA780-INA781EVM — INA780 and INA781 evaluation module for EZShunt™ Digital Power Monitor with built-in shunt resistor
The INA780 and IN781 evaluation module (EVM) is a compact platform for evaluating the main features and performance of the INA780A, INA780B or INA781 high-precision, digital power monitors with EZShunt™ Technology across specified input current, common-mode voltage and temperature ranges. (...)
ANALOG-ENGINEER-CALC — PC software analog engineer's calculator
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 operational-amplifier (...)
Supported products & hardware
Products
Precision op amps (Vos<1mV)
General-purpose op amps
Audio op amps
Transimpedance amplifiers
High-speed op amps (GBW ≥ 50 MHz)
Power op amps
Video amplifiers
Line drivers
Transconductance amplifiers & laser drivers
Fully differential amplifiers
Precision ADCs
Biosensing AFEs
High-speed ADCs (≥10 MSPS)
Receivers
Touchscreen controllers
Difference amplifiers
Instrumentation amplifiers
Audio line receivers
Analog current-sense amplifiers
Digital power monitors
Analog current-sense amplifiers with integrated shunt resistor
Digital power monitors with integrated shunt resistor
Die & wafer services
PSPICE-FOR-TI — PSpice® for TI design and simulation tool
TINA-TI — SPICE-based analog simulation program
Package | Pins | Download |
---|---|---|
VSON (DEK) | 15 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Support & training
TI E2E™ forums with technical support from TI engineers
Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.
If you have questions about quality, packaging or ordering TI products, see TI support.