Datasheet

Electrical Specifications
Technical Data MC68HC912DT128A — Rev 4.0
426 Electrical Specifications MOTOROLA
Table 21-6. Analog Converter Characteristics (Operating)
V
DD
= 5.0 Vdc ±10%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
, ATD Clock = 2 MHz, unless otherwise noted
Characteristic Symbol Min Typical Max Unit
8-bit resolution
(1)
1 count 20 mV
8-bit absolute error
,(2)
2, 4, 8, and 16 ATD sample clocks
AE −1 +1 count
10-bit resolution
(1)
1 count 5 mV
10-bit absolute error
(2)
2, 4, 8, and 16 ATD sample clocks
AE –2.5 2.5 count
1. At V
RH
– V
RL
= 5.12V, one 8-bit count = 20 mV, and one 10-bit count = 5mV.
2. These values include quantization error which is inherently 1/2 count for any A/D converter.
Absolute errors only guaranteed when V
RL
=V
SS
, V
RH
=V
DD
and when external source impedence is close to zero.
Table 21-7. ATD AC Characteristics (Operating)
V
DD
= 5.0 Vdc ±10%, V
SS
= 0 Vdc, T
A
= T
L
to T
H
, ATD Clock = 2 MHz, unless otherwise noted
Characteristic Symbol Min Max Unit
ATD operating clock frequency
f
ATDCLK
0.5 2.0 MHz
Conversion time per channel
0.5 MHz ≤ f
ATDCLK
≤ 2 MHz
16 ATD clocks
30 ATD clocks
t
CONV
8.0
15.0
32.0
60.0
µs
µs
Stop and ATD power up recovery time
(1)
V
DDA
= 5.0V
t
SR
10 µs
1. From the time ADPU is asserted until the time an ATD conversion can begin.
Frees
cale Semiconductor,
I
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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