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TMS320F241FN 데이터시트(PDF) 57 Page - Texas Instruments |
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TMS320F241FN 데이터시트(HTML) 57 Page - Texas Instruments |
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57 / 66 page ![]() TMS320C242 DSP CONTROLLER SPRS063B – DECEMBER 1997 – REVISED DECEMBER 1999 57 POST OFFICE BOX 1443 • HOUSTON, TEXAS 77251–1443 operating characteristics over recommended operating condition ranges† PARAMETER DESCRIPTION MIN MAX UNIT V5 5 V Converting 10 mA ICCA Analog supply current VCCA = 5.5 V Non-converting 2 mA ICCA Analog supply current VCCA = VREFHI = 5.5 V PLL or OSC power down 1 mA C Analog inp t capacitance Typical capacitive load on Non-sampling 10 pF Cai Analog input capacitance Ty ical ca acitive load on analog input pin Sampling 30 pF EDNL Differential nonlinearity error Difference between the actual step width and the ideal value "2 LSB EINL Integral nonlinearity error Maximum deviation from the best straight line through the ADC transfer characteristics, excluding the quantizationerror "2 LSB td(PU) Delay time, power-up to ADC valid Time to stabilize analog stage after power-up 10 ms ZAI Analog input source impedance Analog input source impedance for conversions to remain within specifications 10 Ω † Absoluteresolution=4.89mV.AtVREFHI=5VandVREFLO=0V,thisisoneLSB.AsVREFHIdecreases,VREFLOincreases,orboth,theLSBsize decreases. Therefore, the absolute accuracy and differential/integral linearity errors in terms of LSBs increase. ADC input pin circuit One of the most common A/D application errors is inappropriate source impedance. In practice, minimum source impedance should be used to limit the error as well as to minimize the required sampling time; however, the source impedance must be smaller than ZAI. A typical ADC input pin circuit is shown in Figure 31. VIN R1 Requiv VAI (to ADCINx input) R1 = 10 Ω typical Figure 31. Typical ADC Input Pin Circuit |
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