描述 Description

INA740x 是一款數(shù)字功率監(jiān)測器，具有集成式電流檢測元件以及專為電流檢測應(yīng)用而設(shè)計的 16 位 Δ-Σ ADC。該器件可以測量高達 ±39.32A 的滿量程電流，共模電壓支持范圍為 -0.1V 至 +85V。

INA740x 會報告電流、總線電壓、內(nèi)核溫度、功率、電能和電荷累積，并采用精度為 ±0.5% 的集成振蕩器，同時在后臺執(zhí)行所需的計算。集成式溫度傳感器在結(jié)溫范圍內(nèi)精度為 ±2.5°C。

INA740x 采用低溫漂和增益漂移設(shè)計，以使此器件可用于在制造過程中不進行多溫度校準的精密系統(tǒng)。

該器件允許選擇從 50μs 到 4.12ms 的 ADC 轉(zhuǎn)換時間以及從 1x 到 1024x 的采樣平均值，這有助于進一步降低測量數(shù)據(jù)的噪聲。

特性 Features

? Low loss integrated shunt resistor
? Internal resistance: 800 μΩ, T A = 25°C
? Continuous current: ±35 A, T A = 25°C
? Peak measurement capability: ±39.32 A

? Wide common-mode range: –0.1 V to +85 V
? High-resolution, 16-bit delta-sigma ADC
? Current monitoring accuracy: A/B Grade, maximum
? Offset current: ±6.25 mA / ±62.5 mA
? Offset drift: ±25 μA/°C (A and B Grades)
? System gain error: ±0.75% / ±1.25%
? System gain error drift: ±25 PPM/°C, typical
? Common-mode rejection: ±0.125 / ±1.25 mA/V

? Power monitoring accuracy: A/B Grade, maximum
? ±0.85% / ±1.55% at 25°C, full scale

? Energy and charge accuracy: A/B Grade, maximum
? ±1.35% / ±2.05% 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)