MCF51QU128VHS FREESCALE [Freescale Semiconductor, Inc], MCF51QU128VHS Datasheet - Page 36

• Manufacturer Part Number: MCF51QU128VHS
• Description: MCF51QU128
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

Analog
6.6
6.6.1 ADC electrical specifications
All ADC channels meet the 12-bit single-ended accuracy specifications.
6.6.1.1 12-bit ADC operating conditions
1. Typical values assume V
2. DC potential difference.
3. This resistance is external to MCU. The analog source resistance should be kept as low as possible in order to achieve the
4. To use the maximum ADC conversion clock frequency, the ADHSC bit should be set and the ADLPC bit should be clear.
36
Symbol
ΔV
ΔV
V
V
C
R
V
f
V
reference only and are not tested in production.
best results. The results in this datasheet were derived from a system which has <8 Ω analog source resistance. The R
C
C
ADCK
R
REFH
REFL
ADIN
ADIN
ADIN
DDA
AS
rate
DDA
SSA
AS
time constant should be kept to <1ns.
Analog
Supply voltage
Supply voltage
Ground voltage
ADC reference
voltage high
Reference
voltage low
Input voltage
Input
capacitance
Input resistance
Analog source
resistance
ADC conversion
clock frequency
ADC conversion
rate
Description
MCF51QU128 Advance Information Data Sheet, Rev. 1, 08/2011.
DDA
Table 24. 12-bit ADC operating conditions
Absolute
Delta to V
V
Delta to V
V
12 bit modes
f
≤ 12 bit modes
≤ 12 bit modes
No ADC hardware
averaging
Continuous
conversions enabled,
subsequent conversion
time
Conditions
= 3.0 V, Temp = 25°C, f
ADCK
DDA
SSA
• 8/10/12 bit
)
)
< 4MHz
modes
DD
SS
(V
(V
SS
DD
-
-
Preliminary
ADCK
20.000
V
V
1.71
-100
-100
1.13
Min.
1.0
REFL
—
—
—
—
= 1.0 MHz unless otherwise stated. Typical values are for
SSA
Typ.
V
V
—
DDA
—
—
—
—
SSA
0
0
4
2
1
818.330
V
+100
+100
V
V
Max.
18.0
3.6
REFH
DDA
SSA
5
5
5
Freescale Semiconductor, Inc.
Ksps
MHz
Unit
mV
mV
pF
kΩ
kΩ
V
V
V
V
Notes
2
2
3
4
5
AS
/