INA237
- High-resolution, 16-bit delta-sigma ADC
- Current monitoring accuracy:
- Offset voltage: ±50 µV (maximum)
- Offset drift: ±0.02 µV/°C (maximum)
- Gain error: ±0.3% (maximum)
- Gain error drift: ±50 ppm/°C (maximum)
- Common mode rejection: 120 dB (minimum)
- Power monitoring accuracy:
- 1.6% full scale, –40°C to +125°C (maximum)
- Fast alert response: 75 µs
- Wide common-mode range: –0.3 V to +85 V
- Bus voltage sense input: 0 V to 85 V
- Shunt full-scale differential range: ±163.84 mV / ±40.96 mV
- Input bias current: 2.5 nA (maximum)
- Temperature sensor: ±1°C (maximum at 25°C)
- Programmable conversion time and averaging
- 2.94-MHz high-speed I2C 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 INA237 is an ultra-precise digital power monitor with a 16-bit delta-sigma ADC specifically designed for current-sensing applications. The device can measure a full-scale differential input of ±163.84 mV or ±40.96 mV across a resistive shunt sense element with common-mode voltage support from –0.3 V to +85 V.
The INA237 reports current, bus voltage, temperature, and power, all while performing the needed calculations in the background. The integrated temperature sensor is ±1°C accurate for die temperature measurement and is useful in monitoring the system ambient temperature.
The low offset and gain drift design of the INA237 allows the device to be used in precise systems that do not undergo multi-temperature calibration during manufacturing. Further, the very low offset voltage and noise allow for use in A to kA sensing applications and provide a wide dynamic range without significant power dissipation losses on the sensing shunt element. The low input bias current of the device permits the use of larger current-sense resistors, thus providing accurate current measurements in the micro-amp range.
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.
技術文件
類型 | 標題 | 日期 | ||
---|---|---|---|---|
* | Data sheet | INA237 85-V, 16-Bit, Precision Power Monitor With I2C Interface datasheet (Rev. A) | PDF | HTML | 2022年 5月 11日 |
Application brief | Improving Power Amplifier Efficiency With Current Monitors (Rev. B) | PDF | HTML | 2023年 7月 24日 | |
EVM User's guide | INA228, INA229, INA237, INA238, and INA239 EVM User’s Guide (Rev. E) | PDF | HTML | 2022年 8月 17日 | |
Application note | Using a PCB Copper Trace as a Current-Sense Shunt Resistor | PDF | HTML | 2022年 1月 25日 | |
Application note | Digital Interfaces for Current Sensing Devices (Rev. A) | PDF | HTML | 2021年 9月 30日 | |
Application brief | Integrating the Current Sensing Signal Path (Rev. B) | PDF | HTML | 2021年 9月 29日 | |
Application brief | Integrated, Current Sensing Analog-to-Digital Converter (Rev. A) | PDF | HTML | 2021年 9月 28日 | |
Application note | Getting Started with Digital Power Monitors (Rev. A) | PDF | HTML | 2021年 9月 2日 | |
Certificate | INA237EVM EU RoHS Declaration of Conformity (DoC) (Rev. A) | 2020年 12月 16日 | ||
Application note | Understanding the I2C Bus | PDF | HTML | 2015年 6月 30日 |
設計與開發
如需其他條款或必要資源,請按一下下方的任何標題以檢視詳細頁面 (如有)。
INA228_237_238EVM — INA228、INA237 和 INA238 評估模組
此評估模組 (EVM) 是一款易於使用的平台,可評估 INA228、INA237 或 INA238 的主要功能與性能。
EVM 支援高達 10-A 的電流量測,並隨附圖形使用者介面 (GUI) 支援,可讀取及寫入裝置暫存器。
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 (...)
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精密度運算放大器 (Vos<1mV)
一般用途運算放大器
音訊運算放大器
轉阻放大器
高速運算放大器 (GBW ≥ 50 MHz)
功率運算放大器
視訊放大器
線路驅動器
轉導放大器與雷射驅動器
全差分放大器
精確 ADC
生物感測 AFE
高速 ADC (≥10 MSPS)
接收器
觸控式螢幕控制器
差分放大器
儀器放大器
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類比電流感測放大器
數位電源監測器
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具整合式分流電阻器的數位電源監測器
晶粒與晶圓服務
CS-AMPLIFIER-ERROR-TOOL — Current Sense Amplifier Comparison and Error Tool
支援產品和硬體
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類比電流感測放大器
數位電源監測器
SBOR021 — Power Monitor Tool
支援產品和硬體
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數位電源監測器
具整合式分流電阻器的數位電源監測器
PSPICE-FOR-TI — PSpice® for TI 設計與模擬工具
TINA-TI — 基於 SPICE 的類比模擬程式
PMP23365 — 具備外部熱插拔及遙測功能的 24V、3A 8 類 PoE PD 參考設計
封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
---|---|---|
VSSOP (DGS) | 10 | Ultra Librarian |
訂購與品質
- RoHS
- REACH
- 產品標記
- 鉛塗層/球物料
- MSL 等級/回焊峰值
- MTBF/FIT 估算值
- 材料內容
- 認證摘要
- 進行中持續性的可靠性監測
- 晶圓廠位置
- 組裝地點