MC68HC11KW1 Datasheet, PDF (214/238 Pages) Motorola, Inc – High-density complementary metal oxide semiconductor HCMOS) microcontroller unit

A.5.2 Analog-to-digital converter characteristics
A
(V_DD = 5.0V ± 5%, V_SS = 0V, V_RH = V_DD, V_RL = V_SS, T_A = T_L to T_H, 750kHz ≤ E ≤ 4MHz, unless otherwise noted⁽¹⁾)
Characteristic
Parameter
Min. Absolute Max. Unit
Resolution
Number of bits resolved by ADC
—
10
— bits
Non-linearity⁽²⁾
Offset error⁽²⁾
Maximum deviation from the best fitting ADC
transfer characteristics
—
Maximum offset from ADC transfer characteristics
—
—
± 1.0 LSB
—
± 1.0 LSB
Total unadjusted error
Maximum deviation from the ideal ADC transfer
characteristics
—
—
± 1.5 LSB
Quantization error Uncertainty due to converter resolution
—
—
± 0.5 LSB
Difference between the actual input voltage and the
Absolute accuracy full-scale weighted equivalent of the binary output
—
code, including all error sources
—
± 2.0 LSB
Conversion range Analog input voltage range
Analog input voltage⁽³⁾ Maximum and minimum analog input voltage
V_RL
—
V_RH
V
V_RL – 0.3
—
1.125V_RH V
V_RH
Maximum analog reference voltage
V_RL
—
V_DD + 0.1 V
V_RL
Minimum analog reference voltage
V_SS – 0.1
—
V_RH
V
∆V_R
Minimum difference between V_RH and V_RL
4.5
—
—
V
Monotinicity
Conversion result never decreases with an increase
in input voltage and has no missing codes
Guarantee
d
Zero input reading
Full scale reading
Input leakage⁽⁴⁾
Conversion result when V_in = V_RL
Conversion result when V_in = V_RH
Input leakage on A/D pins: PE[7:0], PG[7,6]
0000
—
— Hex
—
—
FFC0 Hex
—
—
400 nA
Input leakage V_rh to V_rl V_rh to V_rl divider chain current consumption
300 µA
(1) In order to attain these accuracies with the ECK > 2.1MHz, the ADER bit in ADFRQ must be set.
Input clock duty cycles other than 50% will affect the A/D accuracies
(2) Non-linearity and offset error are characterised using the process window parameters affecting the ADC accuracy, but
they are not tested
(3) Minimum analogue input voltage should not go below V_RL-0.3V
Maximum analogue input voltage should not exceed 1.125V_rh
(4) Source impedance should equal approximately 1 KΩ. Source impedances greater than 1 KΩ affect accuracy adversely
because of input leakage.
A-10
ELECTRICAL SPECIFICATIONS
MC68HC11KW1