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MC68HC05B6_13 Datasheet, PDF (139/302 Pages) Freescale Semiconductor, Inc – Microcontrollers | |||
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Table 11-5 A/D characteristics for 3.3V operation
(VDD = 3.3 Vdc ± 10%, VSS = 0 Vdc, TA = TL to TH)
Characteristic
Parameter
Min
Max
Unit
Resolution
Number of bits resolved by the A/D
8
â
Bit
Non-linearity
Quantization error
Max deviation from the best straight line through the A/D
transfer characteristics
â
(VRH = VDD and VRL = 0V)
Uncertainty due to converter resolution
â
±1
LSB
±1
LSB
Absolute accuracy
Difference between the actual input voltage and the
full-scale equivalent of the binary code output code for all
â
errors
±2
LSB
Conversion range
VRH
VRL
âVR
Conversion time
Analog input voltage range
VRL
VRH
V
Maximum analog reference voltage
VRL
VDD + 0.1
V
Minimum analog reference voltage
VSS â 0.1
VRH
V
Minimum difference between VRH and VRL
3
â
V
Total time to perform a single analog to digital conversion
Internal RC oscillator
â
32
µs
Monotonicity
Conversion result never decreases with an increase in
input voltage and has no missing codes
GUARANTEED
Zero input reading
Full scale reading
Sample acquisition time
Conversion result when VIN = VRL
Conversion result when VIN = VRH
Analog input acquisition sampling
Internal RC oscillator(1)
00
â
Hex
â
FF
Hex
â
12
µs
Sample/hold capacitance Input capacitance on PD0/AN0âPD7/AN7
â
Input leakage(2)
Input leakage on A/D pins PD0/AN0âPD7/AN7, VRL, VRH â
12
pF
1
µA
(1) Source impedances greater than 10k⦠will adversely affect internal charging time during input sampling.
(2) The external system error caused by input leakage current is approximately equal to the product of R source and input
current. Input current to A/D channel will be dependent on external source impedance (see Figure 8-2).
11
MC68HC05B6
Rev. 4.1
ELECTRICAL SPECIFICATIONS
Freescale
11-9
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