
Analog-to-Digital Converter (ADC) Characteristics
MC68HC908EY16 MC68HC908EY8 Data Sheet, Rev. 10
Freescale Semiconductor
247
20.10 Analog-to-Digital Converter (ADC) Characteristics
Characteristic
Symbol
Min
Typ
Max
Unit
Notes
Supply voltage
VDDA
4.5
—
5.5
V
VDDA should be tied to
the same potential as
VDD via separate traces
Input voltages
VADIN
0—
VDDA
V
VADIN <= VDDA
Resolution
BAD
10
—
10
Bits
Absolute accuracy
AAD
–4
—
+4
LSB
Includes quantization
ADC internal clock
fADIC
500 k
—
1.048 M
Hz
tAIC = 1/fADIC
Conversion range
RAD
VSSA
—
VDDA
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
Full-scale reading
FADI
3FC
—
3FF
Hex
Input capacitance
CADI
—
30
pF
Not tested
VREFH/VREFL current
IVREF
—1.6
—
mA
Absolute accuracy
(8-bit truncated mode)
AAD
–1
—
+1
LSB
Includes quantization
Zero input reading
(8-bit truncated mode)
ZADI
00
—
01
Hex
Full-scale reading
(8-bit truncated mode)
FADI
FE
—
FF
Hex
Quantization error
(8-bit truncated mode)
——
—
+7/8
–1/8
LSB