AT89C5132-ROTIL datasheet(170/181 Pages) ATMEL

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170

4173D–USB–02/06

AT89C5132

24.2.7

Analog to Digital Converter

24.2.7.1

Definition of Symbols

Table 120. Analog to Digital Converter Timing Symbol Definitions

24.2.7.2

Characteristics

Table 37. Analog to Digital Converter AC Characteristics

DD = 2.7 to 3.3 V, TA = -40 to +85°C

Notes:

1. AVDD= 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 24-20).

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 24-20).

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

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

(see Figure 24-20).

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 24-20).

Signals

Conditions

CClock

HHigh

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

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