AT80SND1C-ROTIL datasheet(197/210 Pages) ATMEL

197 / 210 page

197

AT8xC51SND1C

4109E–8051–06/03

Analog to Digital Converter

Definition of symbols

Table 172. Analog to Digital Converter Timing Symbol Definitions

Characteristics

Table 173. Analog to Digital Converter AC Characteristics

DD = 2.7 to 3.3 V, TA = -40 to +85°C

Notes:

1. AV

DD= AVREFP= 3.0 V, AVSS= AVREFN= 0 V. ADC is monotonic with no missing code.

2. The differential non-linearity is the difference between the actual step width and the

ideal step width (see Figure 154).

3. The integral non-linearity is the peak difference between the center of the actual step

and the ideal transfer curve after appropriate adjustment of gain and offset errors

(see Figure 154).

4. The offset error is the absolute difference between the straight line which fits the

actual transfer curve (after removing of gain error), and the straight line which fits the

ideal transfer curve (see Figure 154).

5. The gain error is the relative difference in percent between the straight line which fits

the actual transfer curve (after removing of offset error), and the straight line which

fits the ideal transfer curve (see Figure 154).

Waveforms

Figure 153. Analog to Digital Converter Internal Waveforms

Signals

Conditions

Clock

High

Enable (ADEN bit)

Low

Start Conversion

(ADSST bit)

Symbol

Parameter

Min

Max

Unit

CLCL

Clock Period

µs

EHSH

Start-up Time

µs

SHSL

Conversion Time

11·T

CLCL

µs

DLe

Differential non-

linearity error(1)(2)

1LSB

ILe

Integral non-

linearity errorss

(1)(3)

2LSB

OSe

Offset error

(1)(4)

4LSB

Gain error

(1)(5)

4LSB

ADEN Bit

ADSST Bit

TEHSH

SHSL

CLK

TCLCL

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