C504 Datasheet, PDF (37/49 Pages) Siemens Semiconductor Group – 8-Bit CMOS Microcontroller

C504
A/D Converter Characteristics
V_CC = 5 V + 10%, – 15%; V_SS = 0 V
4V ≤ V_AREF ≤ V_CC + 0.1 V;
V_SS – 0.1 V ≤ V_AGND ≤ V_SS + 0.2 V;
T_A = 0 to 70 °C
T_A = – 40 to 85 °C
T_A = – 40 to 110 °C
T_A = – 40 to 125 °C
for the SAB-C504
for the SAF-C504
for the SAH-C504
for the SAK-C504
Parameter
Analog input voltage
Sample time
Symbol
V_AIN
t_S
Conversion cycle time t_ADCC
Total unadjusted error T_UE
Internal resistance of
R_AREF
reference voltage source
Internal resistance of
analog source
R_ASRC
ADC input capacitance C_AIN
Limit Values
min. max.
V_AGND
–
–
–
V_AREF
64 x t_IN
32 x t_IN
16 x t_IN
8 x t_IN
384 x t_IN
192 x t_IN
96 x t_IN
48 x t_IN
±2
–
±4
Unit
V
ns
ns
LSB
LSB
–
t_ADC / 250 kΩ
– 0.25
–
t_S / 500 kΩ
– 0.25
–
50
pF
Test Condition
1)
Prescaler ÷ 32
Prescaler ÷ 16
Prescaler ÷ 8
Prescaler ÷ 4 ²⁾
Prescaler ÷ 32
Prescaler ÷ 16
Prescaler ÷ 8
Prescaler ÷ 4 ³⁾
V_SS + 0.5V ≤ V_IN ≤ V_CC – 0.5V ⁴⁾
V_SS < V_IN < V_SS + 0.5V
V_CC – 0.5V < V_IN < V_CC
4)
t_ADC in [ns] ^{5) 6)}
t_S in [ns] ^{2) 6)}
6)
Notes see next page.
Clock calculation table :
Clock Prescaler
Ratio
÷ 32
÷ 16
÷8
÷4
ADCL1, 0 t_ADC
11
10
01
00
32 x t_IN
16 x t_IN
8 x t_IN
4 x t_IN
t_S
64 x t_IN
32 x t_IN
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
384 x t_IN
192 x t_IN
96 x t_IN
48 x t_IN
Semiconductor Group
37