Electrical Specifications
22.8 5V ADC Electrical Characteristics
Table 22-7. ADC Electrical Characteristics (5V)
Characteristic(1)
Symbol
Min
Max
Unit
Notes
VDDA is an dedicated pin and should
VDDA
Supply voltage
4.5
5.5
V
be tied to VDD on the PCB with
proper decoupling.
VADIN
BAD
VDDA
10
VADIN ≤ VDDA
Input range
Resolution
0
V
10
bits
Includes quantization.
0.5 LSB = 1 ADC step.
AAD
Absolute accuracy
—
1.5
LSB
fADIC
RAD
tADIC = 1/fADIC
ADC internal clock
Conversion range
500k
1.048M
VREFH
Hz
V
VREFL
ADC voltage reference
high
VREFH
VREFL
tADC
VDDA + 0.1
—
V
V
ADC voltage reference
low
VSSA – 0.1
—
17
—
tADIC
cycles
Conversion time
Sample time
16
5
tADIC
cycles
tADS
MAD
ZADI
FADI
Monotonicity
Guaranteed
VADIN = VREFL
VADIN = VREFH
Not tested.
Zero input reading
Full-scale reading
Input capacitance
Input impedance
000
3FD
—
001
3FF
20
HEX
HEX
pF
CADI
RADI
IVREF
20M
—
—
Ω
VREFH/VREFL
1.6
mA
Not tested.
1. VDD = 4.5 to 5.5 Vdc, VSS = 0 Vdc, TA = TL to TH, unless otherwise noted.
MC68HC908AP Family Data Sheet, Rev. 4
302
Freescale Semiconductor
FREESCALE [ Freescale ]
