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INA151CDDFR Scheda tecnica(PDF) 24 Page - Texas Instruments |
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INA151CDDFR Scheda tecnica(HTML) 24 Page - Texas Instruments |
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24 / 39 page  8.2.1.1 Design Requirements For this application, the design requirements are as provided in Table 8-1. Table 8-1. Design Requirements DESCRIPTION of INA151 VALUE Power supply voltage VS± = ±5V for Cell1Cell16 Battery cell voltage VBAT = 0V to 4.5V Common-mode voltage VCM = 0V to 67.5V Output Voltage VOUT = 3.3V Enable Time ten=13μs Filtering Rfilt=1.2kΩ, Cfilt=150pF Accuracy target 0.1% at TA=25ºC DESCRIPTION of ADC in C2000F280025C VALUE Full-scale range of ADC VADC(fs) = VOUT = 3.3V Acquisition Time tacq=1μs Conversion Time tconv=0.2μs Sampling Rate per Channel 4.4kSPS Resolution 12 bits (4096 codes) LSB Size +5V / 4096 = 805.66μV/LSB 8.2.1.2 Detailed Design Procedure The subsequent sections outline guidelines and calculations for dc accuracy analysis DC Accuracy Calculations, design considerations for external RC filtering in RC Filter Design Consideration and ADC input protection recommendation. The analysis is provided for the INA151B paired with the ADC of the C2000 (TMS320F280025) Microcontroller from the Figure 8-2 application circuit with given design requirements. 8.2.1.2.1 DC Accuracy Calculations Table 8-2. INA151B - Typical and Maximum DC Accuracy Calculations for FSR of 4.5V Error Source Error Calculation for FSR=4.5V Spec (Typ) Error (PPM) Spec (Max) Error (PPM) Absolute accuracy at 25°C of Cell1 Input stage offset voltage VOSI VOSIFSR×106 200μV 44.4 1200μV 266.7 Common-mode rejection ratio CMRRERROR 10VCMCMRR20,VCM = 0V 140dB 0 125dB 0 Gain error from INA151 GE GE%×106 0.01% 10 0.03 30 Total error (RSS) VOSI2+GE2+CMRRERROR2 45.1 268.3 Absolute accuracy at 25°C of Cell16 Input stage offset voltage VOSI VOSIFSR×106 200μV 44.4 1200μV 268.3 Common-mode rejection ratio CMRRERROR 10VCMCMRR20,VCM = 67.5V 140dB 1.5 125dB 37.9 Gain error from INA151 GE GE%×106 0.01% 10 0.03% 30 INA151 SLVSIL6C – JANUARY 2026 – REVISED APRIL 2026 www.ti.com 24 Submit Document Feedback Copyright © 2026 Texas Instruments Incorporated Product Folder Links: INA151 |
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