ADC0804LCWM datasheet(13/56 Pages) TI1

13 / 56 page

ADC0801, ADC0802, ADC0803, ADC0804, ADC0805

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SNOSBI1C – NOVEMBER 2009 – REVISED JUNE 2015

Feature Description (continued)

Next to each transfer function is shown the corresponding error plot. Many people may be more familiar with

error plots than transfer functions. The analog input voltage to the ADC is provided by either a linear ramp or by

the discrete output steps of a high resolution DAC. Notice that the error is continuously displayed and includes

the quantization uncertainty of the ADC. For example the error at point 1 of Figure 21 is +1

⁄2 LSB because the

digital code appeared 1

⁄2 LSB in advance of the center-value of the tread. The error plots always have a

constant negative slope and the abrupt up-side steps are always 1 LSB in magnitude.

Figure 17. Clarifying the Error Specs of an ADC Converter

Figure 16. Transfer Function of Analog Input vs Digital

Accuracy=±0 LSB: A Perfect ADC

Output Code in Ideal ADC

Figure 18. Transfer Function of Analog Input vs Digital

Figure 19. Clarifying the Error Specs of an ADC Converter

Output Code for ±1/4 LSB Accuracy ADC

Accuracy =±1

⁄4 LSB

Figure 20. Transfer Function of Analog Input vs Digital

Figure 21. Clarifying the Error Specs of an ADC Converter

Output Code for ±1/2 LSB Accuracy ADC

Accuracy = ±1

⁄2 LSB

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ADC0804LCWM Datasheet(PDF) 13 Page - Texas Instruments