Datasheet

ADC10 Characteristics
MC68HC908QB8 Data Sheet, Rev. 3
Freescale Semiconductor 219
18.13 ADC10 Characteristics
Characteristic Conditions Symbol Min
Typ
(1)
Max Unit Comment
Supply voltage Absolute V
DD
2.7 — 5.5 V
Supply Current
ADLPC = 1
ADLSMP = 1
ADCO = 1
V
DD
< 3.3 V (3.0 V Typ)
I
DD
(2)
—55—
μA
V
DD
< 5.5 V (5.0 V Typ) — 75 —
Supply current
ADLPC = 1
ADLSMP = 0
ADCO = 1
V
DD
< 3.3 V (3.0 V Typ)
I
DD
(2)
— 120 —
μA
V
DD
< 5.5 V (5.0 V Typ) — 175 —
Supply current
ADLPC = 0
ADLSMP = 1
ADCO = 1
V
DD
< 3.3 V (3.0 V Typ)
I
DD
(2)
— 140 —
μA
V
DD
< 5.5 V (5.0 V Typ) — 180 —
Supply current
ADLPC = 0
ADLSMP = 0
ADCO = 1
V
DD
< 3.3 V (3.0 V Typ)
I
DD
(2)
— 340 —
μA
V
DD
< 5.5 V (5.0 V Typ) — 440 615
ADC internal clock
High speed (ADLPC = 0)
f
ADCK
0.40
(3)
—2.00
MHz t
ADCK
= 1/f
ADCK
Low power (ADLPC = 1) 0.40
(3)
—1.00
Conversion time
(4)
10-bit Mode
Short sample (ADLSMP = 0)
t
ADC
19 19 21
t
ADCK
cycles
Long sample (ADLSMP = 1) 39 39 41
Conversion time
(4)
8-bit Mode
Short sample (ADLSMP = 0)
t
ADC
16 16 18
t
ADCK
cycles
Long sample (ADLSMP = 1) 36 36 38
Sample time
Short sample (ADLSMP = 0)
t
ADS
444
t
ADCK
cycles
Long sample (ADLSMP = 1) 24 24 24
Input voltage V
ADIN
V
SS
—V
DD
V
Input capacitance C
ADIN
— 7 10 pF Not tested
Input impedance R
ADIN
—515 kΩ Not tested
Analog source impedance R
AS
——10 kΩ
External to
MCU
Ideal resolution (1 LSB)
10-bit mode
RES
1.758 5 5.371
mV V
REFH
/2
N
8-bit mode 7.031 20 21.48
Total unadjusted error
10-bit mode
E
TUE
0 ±1.5 ±2.5
LSB
Includes
quantization
8-bit mode 0 ±0.7 ±1.0
Differential non-linearity
10-bit mode
DNL
0 ±0.5 —
LSB
8-bit mode 0 ±0.3 —
Monotonicity and no-missing-codes guaranteed
— Continued on next page