ANALOG-TO-DIGITAL CONVERTER
M68HC16 Z SERIES
8-22
USER’S MANUAL
In
, R
F
and C
F
comprise the user's external filter circuit. C
S
is the internal
sample capacitor. Each channel has its own capacitor. C
S
is never precharged; it re-
tains the value of the last sample. V
I
is an internal voltage source used to precharge
the DAC capacitor array (C
DAC
) before each sample. The value of this supply is V
DDA
/
2, or 2.5 volts for 5-volt operation.
The following paragraphs provide a simplified description of the interaction between
the ADC and the user's external circuitry. This circuitry is assumed to be a simple RC
low-pass filter passing a signal from a source to the ADC input pin. The following sim-
plifying assumptions are made:
• The source impedance is included with the series resistor of the RC filter.
• The external capacitor is perfect (no leakage, no significant dielectric absorption
characteristics, etc.)
• All parasitic capacitance associated with the input pin is included in the value of
the external capacitor.
• Inductance is ignored.
• The “on” resistance of the internal switches is zero ohms and the “off” resistance
is infinite.
8.8.6.1 Settling Time for the External Circuit
The values for R
F
and C
F
in the user's external circuitry determine the length of time
required to charge C
F
to the source voltage level (V
SRC
).
At time t = 0, S1 in
closes. S2 is open, disconnecting the internal circuitry
from the external circuitry. Assume that the initial voltage across CF is zero. As CF
charges, the voltage across it is determined by the following equation, where t is the
total charge time:
When t = 0, the voltage across C
F
= 0. As t approaches infinity, V
CF
will equal V
SRC
.
(This assumes no internal leakage.) With 10-bit resolution, 1/2 of a count is equal to
1/2048 full-scale value. Assuming worst case (V
SRC
= full scale),
shows
the required time for C
F
to charge to within 1/2 of a count of the actual source voltage
during 10-bit conversions.
NOTE
The following times are completely independent of the A/D converter
architecture (assuming the ADC is not affecting the charging).
V
CF
V
SRC
1
e
–
t
–
R
F
C
F
⁄
(
)
=
F
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Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
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