88
AT89/83EB5114
4311C–8051–02/08
DC Parameters for A/D
Converter
TA = 0°C to +70°C; VSS = 0 V; VCC = 3V to 3,6 V; F = 0 to 24MHz.
TA = -40°C to +85°C; VSS = 0 V; VCC = 3V to 3,6 V; F = 0 to 24MHz.
Table 2. DC Parameters for Low Voltage
Note:
(1) With lsb = 2.4/1024 = 2.4mV, typical integral linearity is:
AC Parameters
Explanation of the AC
Symbols
Each timing symbol has 5 characters. The first character is always a “T” (stands for
Time). The other characters, depending on their positions, stand for the name of a sig-
nal or the logical status of that signal. The following is a list of all the characters and
what they stand for.
Example:TXHDV = Time from clock rising edge to input data valid.
TA = 0 to +70°C (commercial temperature range); VSS = 0 V; 3 V < VCC < 3.6 V; -L range.
TA = -40°C to +85°C (industrial temperature range); VSS = 0 V; 3 V < VCC < 3.6 V; -L
range.
Table 3. gives the maximum applicable load capacitance for Port 1, 3 and 4. Timings will
be guaranteed if these capacitances are respected. Higher capacitance values can be
used, but timings will then be degraded.
Table 3. Load Capacitance versus speed range, in pF
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
Resolution
10
bit
AVin
Analog input voltage
Vss - 0.2
Vcc + 0.2
V
Rref
Resistance between Vref and Vss
13
18
24
KO
hm
Vref
Value of integrated voltage source
2.30
2.40
2.50
V
Vref
drift
Vref Voltage drift over temperature
150
uV/
°C
Lref
Load on integrated voltage source
10
KO
hm
Cai
Analog input Capacitance
60
pF During sampling
Integral non linearity
1
2
lsb
With ideal
external Ref (1)
Differential non linearity
0.5
1
lsb
Offset error
-2
2
lsb
Input source impedance
1
KO
hm
For 10 bit
resolution at
maximum speed
2 4
,
Vref
–
(
)
2 4
,
3
–
×10
-------------------------------
-L
Port 3 & 4
60