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MSP430FG4618IPZR データシート(PDF) 39 Page - Texas Instruments |
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MSP430FG4618IPZR データシート(HTML) 39 Page - Texas Instruments |
39 / 116 page Positive Negative VR+ GainError OffsetError DACCode DACVOUT Idealtransfer function RLoad = AVCC CLoad =100pF 2 DACOutput 39 MSP430FG4619, MSP430FG4618, MSP430FG4617, MSP430FG4616 MSP430CG4619, MSP430CG4618, MSP430CG4617, MSP430CG4616 www.ti.com SLAS508K – APRIL 2006 – REVISED MAY 2020 Submit Documentation Feedback Product Folder Links: MSP430FG4619 MSP430FG4618 MSP430FG4617 MSP430FG4616 MSP430CG4619 MSP430CG4618 MSP430CG4617 MSP430CG4616 Specifications Copyright © 2006–2020, 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. 5.34 12-Bit DAC, Linearity Specifications over recommended ranges of supply voltage and operating free-air temperature (unless otherwise noted) (see Figure 5-26) PARAMETER TEST CONDITIONS VCC MIN TYP MAX UNIT Resolution 12-bit monotonic 12 bits INL Integral nonlinearity(1) Vref = 1.5 V, DAC12AMPx = 7, DAC12IR = 1 2.2 V ±2.0 ±8.0 LSB Vref = 2.5 V, DAC12AMPx = 7, DAC12IR = 1 3 V DNL Differential nonlinearity(1) Vref = 1.5 V, DAC12AMPx = 7, DAC12IR = 1 2.2 V ±0.4 ±1.0 LSB Vref = 2.5 V, DAC12AMPx = 7, DAC12IR = 1 3 V EO Offset voltage without calibration(1) (2) Vref = 1.5 V, DAC12AMPx = 7, DAC12IR = 1 2.2 V ±21 mV Vref = 2.5 V, DAC12AMPx = 7, DAC12IR = 1 3 V Offset voltage with calibration (1) (2) Vref = 1.5 V, DAC12AMPx = 7, DAC12IR = 1 2.2 V ±2.5 Vref = 2.5 V, DAC12AMPx = 7, DAC12IR = 1 3 V dE(O)/dT Offset error temperature coefficient(1) 2.2 V, 3 V ±30 µV/°C EG Gain error(1) VREF = 1.5 V 2.2 V ±3.5 %FSR VREF = 2.5 V 3 V dE(G)/dT Gain temperature coefficient(1) 2.2 V, 3 V 10 ppm of FSR/°C tOffset_Cal Time for offset calibration(3) DAC12AMPx = 2 2.2 V, 3 V 100 ms DAC12AMPx = 3, 5 32 DAC12AMPx = 4, 6, 7 6 Figure 5-26. Linearity Test Load Conditions and Gain and Offset Definition |
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