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MSP430FG479 データシート(PDF) 35 Page - Texas Instruments |
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MSP430FG479 データシート(HTML) 35 Page - Texas Instruments |
35 / 97 page Positive Negative VR+ GainError OffsetError DACCode DACVOUT Idealtransfer function RLoad = AVCC CLoad =100pF 2 DACOutput 35 MSP430FG479, MSP430FG478, MSP430FG477 www.ti.com SLAS580E – OCTOBER 2008 – REVISED MAY 2020 Submit Documentation Feedback Product Folder Links: MSP430FG479 MSP430FG478 MSP430FG477 Specifications Copyright © 2008–2020, Texas Instruments Incorporated (1) Parameters calculated from the best-fit curve from 0x0A to 0xFFF. The best-fit curve method is used to deliver coefficients “a” and “b” of the first order equation: y = a + b × x. VDAC12_xOUT = EO + (1 + EG) × (VeREF+/4095) × DAC12_xDAT, DAC12IR = 1. (2) The offset calibration works on the output operational amplifier. Offset calibration is triggered by setting bit DAC12CALON. (3) The offset calibration can be done if DAC12AMPx = {2, 3, 4, 5, 6, 7}. The output operational amplifier is switched off with DAC12AMPx = {0, 1}. TI recommends that the DAC12 module be configured before initiating calibration. Port activity during calibration may effect accuracy and is not recommended. 5.33 12-Bit DAC, Linearity Specifications over recommended operating free-air temperature (unless otherwise noted) (see Figure 5-20) PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT INL Integral nonlinearity(1) VREF,DAC12 = 1.2 V or VREF,ext = 2.5 V DAC12AMPx = 7, DAC12IR = 1 2.7 V ±2.0 ±8.0 LSB DNL Differential nonlinearity(1) VREF,ext = 1.2 V, DAC12AMPx = 7, DAC12IR = 1 2.7 V –1 ±0.4 ±1.3 LSB VREF,ext = 2.5 V, DAC12AMPx = 7, DAC12IR = 1 ±0.4 ±1.0 VREF,DAC12 = 1.2 V, DAC12AMPx = 7, DAC12IR = 1 ±0.4 ±1.0 EO Offset voltage without calibration(1) (2) VREF,DAC12 = 1.2 V, DAC12AMPx = 7, DAC12IR = 1 2.7 V ±20 mV Offset voltage with calibration (1) (2) VREF,DAC12 = 1.2 V, DAC12AMPx = 7, DAC12IR = 1 ±2.5 dE(O)/dT Offset error temperature coefficient(1) 2.7 V ±30 µV/°C EG Gain error(1) VREF,DAC12 = 1.2 V 2.7 V ±3.50 %FSR dE(G)/dT Gain temperature coefficient(1) 2.7 V 10 ppm of FSR/°C tOffset_Cal Time for offset calibration(3) DAC12AMPx = 2 2.7 V 100 ms DAC12AMPx = 3, 5 32 DAC12AMPx = 4, 6, 7 6 Figure 5-20. Linearity Test Load Conditions and Gain and Offset Definition |
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同様の説明 - MSP430FG479 |
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