AT89C5132_06 Datasheet, PDF (170/181 Pages) ATMEL Corporation – USB Microcontroller with 64K Bytes Flash Memory

24.2.7 Analog to Digital Converter
24.2.7.1
Definition of Symbols
Table 120. Analog to Digital Converter Timing Symbol Definitions
Signals
C
Clock
H
E
Enable (ADEN bit)
L
S
Start Conversion
(ADSST bit)
Conditions
High
Low
24.2.7.2
Characteristics
Table 37. Analog to Digital Converter AC Characteristics
V_DD = 2.7 to 3.3 V, T_A = -40 to +85°C
Symbol
Parameter
Min
Max
Unit
T_CLCL
T_EHSH
T_SHSL
DLe
Clock Period
4
Start-up Time
Conversion Time
Differential non-
linearity error⁽¹⁾⁽²⁾
4
11·T_CLCL
1
μs
μs
μs
LSB
ILe
Integral non-linearity
errorss⁽¹⁾⁽³⁾
2
LSB
OSe
Offset error⁽¹⁾⁽⁴⁾
4
LSB
Ge
Gain error⁽¹⁾⁽⁵⁾
4
LSB
Notes:
1. AV_DD= AV_REFP= 3.0 V, AV_SS= AV_REFN= 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).
170 AT89C5132
4173D–USB–02/06