mc68hc912bc32 Freescale Semiconductor, Inc, mc68hc912bc32 Datasheet - Page 312

• Manufacturer Part Number: mc68hc912bc32
• Description: M68hc12 Microcontrollers
• Manufacturer: Freescale Semiconductor, Inc

Electrical Specifications
19.9 Analog Converter Operating Characteristics
312
8-bit resolution
8-bit differential non-linearity
8-bit integral non-linearity
8-bit absolute error
10-bit resolution
10-bit differential non-linearity
10-bit integral non-linearity
10-bit absolute error
Maximum source impedance
1. V
2. V
3. At V
4. Eight-bit absolute error of 1 count (20 mV) includes 1/2 count (10 mV) inherent quantization error and 1/2 count (10 mV)
5. Maximum source impedance is application-dependent. Error resulting from pin leakage depends on junction leakage into
2, 4, 8, and 16 ATD sample clocks
2, 4, 8, and 16 ATD sample clocks
window parameters affecting the ATD accuracy, but they are not tested.
circuit (differential, integral, and offset) error.
the pin and on leakage due to charge-sharing with internal capacitance.
Error from junction leakage is a function of external source impedance and input leakage current. Expected error in result
value due to junction leakage is expressed in voltage (V
Where
DD
RH
I
speed, the number of channels being scanned, and source impedance. For 8-bit conversions, charge pump leakage is
computed as:
OFF
−V
REF
= 5.0 Vdc ± 10%, V
RL
is a function of operating temperature. Charge-sharing effects with internal capacitors are a function of ATD clock
V
V
= 5.12 V, one 8-bit count = 20 mV, and one 10-bit count = 5 mV. INL and DNL are characterized using the process
ERRJ
ERRJ
≥ 5.12 V; V
(2)
(2)
= 0.25 pF × V
= R
(3), (4)
(3)
S
Characteristic
× I
DDA
(3)
OFF
(3)
SS
−V
(3)
(3)
= 0 Vdc, T
SSA
DDA
= 5.12 V
× R
(1)
S
A
× ATDCLK/(8 × number of channels)
M68HC12B Family Data Sheet, Rev. 9.1
= T
L
to T
H
, ATD clock = 2 MHz, unless otherwise noted
ERRJ
):
Symbol
1 count
1 count
DNL
DNL
INL
INL
AE
AE
R
S
−0.5
–2.5
Min
−1
−1
–2
–2
—
—
—
Typ
20
20
—
—
—
—
—
—
5
Freescale Semiconductor
See
Max
+0.5
2.5
+1
+1
—
—
2
2
(5)
Count
Count
Count
Count
Count
Count
Unit
mV
mV
kΩ