參數(shù)資料
型號: QADCRM
英文描述: Queued Analog-to-Digital Converter Reference Manual
中文描述: 排隊模擬到數(shù)字轉(zhuǎn)換器參考手冊
文件頁數(shù): 31/122頁
文件大?。?/td> 940K
代理商: QADCRM
QADC
REFERENCE MANUAL
EXTERNAL MULTIPLEXING
MOTOROLA
4-3
4.2 Module Version Options
The number of available analog channels varies, depending on whether or not exter-
nal multiplexing is used. A maximum of 16 analog channels are supported by the in-
ternal multiplexing circuitry of the converter.
Table 4-1
shows the total number of
analog input channels supported with zero to four external multiplexer chips. The
QADC uses 21 pins which allow a maximum of 41 analog channels to be converted.
NOTES:
1. The above assumes that the external trigger inputs are shared with two analog input pins.
2. When external multiplexing is used, three input channels become multiplexed address out-
puts, and for each external multiplexer chip, one input channel becomes a multiplexed ana-
log input.
Table 4-1 Analog Input Channels
Number of Analog Input Channels Available
Directly Connected + External Multiplexed = Total Channels
1
,
2
No External
Mux Chips
Mux Chip
16
12 + 8 = 20
11 + 16 = 27
One External
Two External
Mux Chips
Three External
Mux Chips
10 + 24 = 34
Four External
Mux Chips
9 + 32 = 41
F
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
n
.
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