MC68HC11PH8 Datasheet, PDF (235/264 Pages) Motorola, Inc – High-density Complementary Metal Oxide Semiconductor (HCMOS) Microcomputer Unit

A.5.3 Analog-to-digital converter characteristics
(V_DD = 5.0 Vdc ± 10%, V_SS = 0 Vdc, T_A = T_L to T_H, 750kHz ≤ E ≤ 4MHz, unless otherwise noted)
Characteristic
Parameter
2MHz⁽¹⁾ 3MHz⁽¹⁾ 4MHz⁽¹⁾
Min. Absolute
Unit
Max. Max. Max.
Resolution
Number of bits resolved by ADC
Ñ
8
Ñ
Ñ
Ñ bits
Non-linearity
Maximum deviation from the ideal ADC transfer
characteristics
Ñ
Ñ
±0.5 ±1
±1 LSB
Zero error
Difference from the output of an ideal ADC for zero
input voltage
Ñ
Ñ
±0.5 ±1
±1 LSB
Full-scale error
Difference from the output of an ideal ADC for
full-scale input voltage
Ñ
Ñ
±0.5 ±1
±1 LSB
Total unadjusted Maximum sum of non-linearity, zero and full-scale
error
errors
Ñ
Ñ
±0.5 ±1.5 ±1.5 LSB
Quantization error Uncertainty due to converter resolution
Ñ
Ñ
±0.5 ±0.5 ±0.5 LSB
Difference between the actual input voltage and the
Absolute accuracy full-scale weighted equivalent of the binary output Ñ
Ñ
±1
±2
±2 LSB
code, including all error sources
Conversion range
V_RH
V_RL
∆V_R
Analog input voltage range
Analog reference voltage (high) ⁽²⁾
Analog reference voltage (low) ⁽²⁾
Minimum difference between V_RH and V_RL ⁽²⁾
V_RL
Ñ
V_RH
V_RH
V_RH V
V_RL
Ñ V_DD+0.1 V_DD+0.1 V_DD+0.1 V
V_SSÐ0.1 Ñ
V_RH
V_RH
V_RH V
3
Ñ
Ñ
Ñ
ÑV
Total time to perform a single A/D conversion:
Conversion time
E clock
Ñ
Internal RC oscillator
Ñ
Monotonicity
Conversion result never decreases with an increase
in input voltage and has no missing codes
Zero input reading Conversion result when V_IN = V_RL
$00
Full-scale reading Conversion result when V_IN = V_RH
Ñ
32
Ñ
Ñ
Ñ ^tCY
Ñ
t_CYC+32
t_CYC+32
t_CYC+32
C
µs
Guaranteed
Ñ
Ñ
Ñ
Ñ Hex
Ñ
$FF $FF $FF Hex
Sample acquisition
time
Analog input acquisition sampling time:
E clock
Internal RC oscillator
Sample/hold
capacitance
Input leakage
Input capacitance (PE[0:7]) during sample
Input leakage on A/D pins:
PE[0:7]
V_RL, V_RH
Ñ
12
Ñ
Ñ
Ñ ^tCY
Ñ
Ñ
12
12
12
C
µs
Ñ 20 (typ) Ñ
Ñ
Ñ pF
Ñ
Ñ
400 400 400 nA
Ñ
Ñ
1.0
1.0
1.0 µA
(1) For f_OP < 2MHz, source impedances should be approximately 10kΩ. For f_OP ≥ 2MHz, source impedances should be in the
range 5Ð10kΩ. Source impedances greater than 10kΩ have an adverse affect on A/D accuracy, because of input leakage.
(2) Performance veriÞed down to ∆V_R = 2.5V, however accuracy is tested and guaranteed at ∆V_R = 5V ± 10%.
12
MC68HC11PH8
ELECTRICAL SPECIFICATIONS (STANDARD)
TPG
MOTOROLA
A-11