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16 Channels
Figure 13-47. Equivalent Analog Input Circuitry
Since the sample amplifier is powered by V
signal levels up to but not exceeding V
signal is outside of this range, the output from the sample amplifier is clipped.
In addition, V
and V
RH
V
is less than or equal to V
RH
amplifier has accurately transferred the input signal, resolution is ratiometric within the
limits defined by V
RL
transfer a full-scale value. If V
a zero value.
Figure 13-48 shows the results of reference voltages outside the range defined by V
V
At the top of the input signal range, V
.
SSA
maximum obtainable 10-bit conversion value of 0x3FE. At the bottom of the signal range,
V
is 15 mV higher than V
SSA
of three.
MOTOROLA Chapter 13. Queued Analog-to-Digital Converter Legacy Mode Operation
PRELIMINARY—SUBJECT TO CHANGE WITHOUT NOTICE
Sample
AMP
CP
DDA
must be within the range defined by V
RL
and V
DDA
RL
and V
If V
is greater than V
RH.
RH
is less than V
RL
, resulting in a minimum obtainable 10-bit conversion value
RL
QADC64E Integration Requirements
VDDA
VRH
S/H
RC DAC
Comparator
V SSA
V RL
QADC64E 16CH SAMPLE AMP
and V
, it can accurately transfer input
DDA
SSA
and down to but not below V
is greater than or equal to V
, the sample amplifier can never
DDA
, the sample amplifier can never transfer
SSA
is 10 mV lower than V
DDA
If the input
SSA.
and V
As long as
DDA
SSA.
and the sample
SSA
DDA
This results in a
RH.
and
13-69
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