Freescale Semiconductor MC68HC908MR32 manual Analog-to-Digital Converter ADC Characteristics, 3FF

Electrical Specifications

19.13 Analog-to-Digital Converter (ADC) Characteristics

Characteristic	Symbol	Min	Typ	Max		Unit	Notes
	VDDAD						VDDAD should be tied to
Supply voltage		4.5	—	5.5		V	the same potential as
							VDD via separate traces
Input voltages	VADIN	0	—	VDDAD		V	VADIN <= VDDAD
Resolution	BAD	10	—	10		Bits
Absolute accuracy	AAD	—	—	± 4		LSB	Includes quantization
ADC internal clock	fADIC	500 k	—	1.048 M		Hz	tAIC = 1/fADIC
Conversion range	RAD	VSSAD	—	VDDAD		V
Power-up time	tADPU	16	—	—		tAIC cycles
Conversion time	tADC	16	—	17		tAIC cycles
Sample time	tADS	5	—	—		tAIC cycles
Monotonicity	MAD				Guaranteed
Zero input reading	ZADI	000	—	003		Hex	VADIN = VSSAD
Full-scale reading	FADI	3FC	—	3FF		Hex	VADIN = VDDAD
Input capacitance	CADI	—	—	30		pF	Not tested
VREFH/VREFL current	IVREF	—	1.6	—		mA
Absolute accuracy	AAD	—	—	± 1		LSB	Includes quantization
(8-bit truncation mode)
Quantization error	—	—	—	+ 7/8		LSB
(8-bit truncation mode)				– 1/8

MC68HC908MR32 • MC68HC908MR16 Data Sheet, Rev. 6.1

274 Freescale Semiconductor