C517A Datasheet, PDF (58/72 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C517A
A/D Converter Characteristics
(Operating Conditions apply)
Parameter
Analog input voltage
Sample time
Conversion cycle time
Total unadjusted error
Internal resistance of
reference voltage source
Internal resistance of
analog source
ADC input capacitance
Notes see next page.
Symbol
V_AIN
t_S
t_ADCC
T_UE
R_AREF
R_ASRC
C_AIN
Limit Values Unit
min. max.
V_AGND
–
–
–
V_AREF
16 x t_IN
8 x t_IN
96 x t_IN
48 x t_IN
±2
V
ns
ns
LSB
–
t_ADC / 250 kΩ
- 0.25
–
t_S / 500 kΩ
- 0.25
–
50
pF
Test Condition
1)
Prescaler ÷ 8
Prescaler ÷ 4 ²⁾
Prescaler ÷ 8
Prescaler ÷ 4 ³⁾
V_SS+0.5V ≤ V_IN ≤ V_DD-0.5V ⁴⁾
t_ADC in [ns] ^{5) 6)}
t_S in [ns] ^{2) 6)}
6)
Clock calculation table :
Clock Prescaler ADCL
Ratio
÷8
1
÷4
0
t_ADC
8 x t_IN
4 x t_IN
t_S
16 x t_IN
8 x t_IN
Further timing conditions : t_ADC min = 500 ns
t_IN = 2 / f_OSC = 2 t_CLCL
t_ADCC
96 x t_IN
48 x t_IN
Semiconductor Group
56