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參數(shù)資料
| 型號： | QADCRM |
| 英文描述： | Queued Analog-to-Digital Converter Reference Manual |
| 中文描述： | 排隊(duì)模擬到數(shù)字轉(zhuǎn)換器參考手冊 |
| 文件頁數(shù)： | 34/122頁 |
| 文件大小： | 940K |
| 代理商： | QADCRM |
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MOTOROLA
5-2
PIN CONNECTION CONSIDERATIONS
For More Information On This Product,
Go to: www.freescale.com
QADC
REFERENCE MANUAL
Figure 5-1 Analog Input Circuitry
Since the sample amplifier is powered by V
DDA
and V
SSA
, it can accurately transfer
input signal levels up to but not exceeding V
DDA
and down to but not below V
SSA
. If
the input signal is outside of this range, the output from the sample amplifier is clipped.
In addition, V
RH
and V
RL
must be within the range defined by V
DDA
and V
SSA
. As long
as V
RH
is less than or equal to V
DDA
and V
RL
is greater than or equal to V
SSA
and the
sample amplifier has accurately transferred the input signal, resolution is ratiometric
within the limits defined by V
RL
and V
RH
. If V
RH
is greater than V
DDA
, the sample am-
plifier can never transfer a full-scale value. If V
RL
is less than V
SSA
, the sample ampli-
fier can never transfer a zero value.
Figure 5-2
shows the results of reference voltages outside the range defined by V
DDA
and V
SSA
. At the top of the input signal range, V
DDA
is 10 mV lower than V
RH
. This
results in a maximum obtainable 10-bit conversion value of 3FE. At the bottom of the
signal range, V
SSA
is 15 mV higher than V
RL
, resulting in a minimum obtainable 10-bit
conversion value of three.
SAMPLE
AMP
8 CHANNELS TOTAL
*
RC DAC
ARRAY
COMPARATOR
REF 1
V
SSA
V
RL
REF 2
V
DDA
V
RH
QADC 8CH SAMPLE AMP
*
TWO SAMPLE AMPS EXIST ON THE QADC WITH 8 CHANNELS
ON EACH SAMPLE AMP.
F
Freescale Semiconductor, Inc.
n
.
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