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參數(shù)資料
| 型號： | EVAL-AD7734EBZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 18/32頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVALUATION FOR AD7734 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 15.4k |
| 數(shù)據(jù)接口： | 串行 |
| 輸入范圍： | ±10 V |
| 在以下條件下的電源（標(biāo)準(zhǔn)）： | 85mW @ 5V |
| 工作溫度： | -40°C ~ 105°C |
| 已用 IC / 零件： | AD7734 |
| 已供物品： | 板，纜線，CD |
| 產(chǎn)品目錄頁面： | 779 (CN2011-ZH PDF) |
| 相關(guān)產(chǎn)品： | AD7734BRUZ-REEL7TR-ND - IC ADC 24BIT 4CH SIG-DEL 28TSSOP AD7734BRUZ-REEL-ND - IC ADC 24BIT 4CH SIG-DEL 28TSSOP AD7734BRUZ-ND - IC ADC 24BIT 4-CH 28-TSSOP AD7734BRU-ND - IC ADC 24BIT 4-CH 28-TSSOP |
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Data Sheet
AD7734
Rev. A | Page 25 of 32
SERIAL
INTERFACE
START
CONTINUOUS
CONVERSION
RDY
CH0 CONVERSION
READ
DATA
CH1
CH1 CONVERSION
CH0 CONVERSION
READ
DATA
CH0
CH1 CONVERSION
READ
DATA
CH0
CH0 CONVERSION
READ
DATA
CH1
Figure 20. Continuous Conversion, CH0 and CH1, RDYFN = 1
SERIAL
INTERFACE
START
CONTINUOUS
CONVERSION
RDY
CH0 CONVERSION
CH1 CONVERSION
CH0 CONVERSION
CH1 CONVERSION
CH0 CONVERSION
Figure 21. Continuous Conversion, CH0 and CH1, No Data Read
DIN
24h
00h
DATA
00h
DATA
00h
STATUS
READ
CH0
DATA
READ
CH0
STATUS
48h
WRITE
COMM.
REGISTER
SCLK
CS
DOUT
WRITE
COMM.
REGISTER
WRITE
MODE
REGISTER
RDY
38h
00h
DATA
00h
DATA
00h
STATUS
READ
CH1
DATA
READ
CH1
STATUS
CONVERSION
ON CH0
COMPLETE
CONVERSION
ON CH1
COMPLETE
Figure 22. Continuous Conversion, CH0 and CH1, Continuous Read
CONTINUOUS READ (CONTINUOUS CONVERSION) MODE
When the Cont RD bit in the mode register is set, the first write
of 48h to the communications register starts the continuous
read mode. As shown in Figure 22, subsequent accesses to the
part sequentially read the channel status and data registers of
the last completed conversion without any further configuration
of the communications register being required.
Note that the continuous conversion bit in the mode register
should be set when entering the continuous read mode.
Note that the continuous read mode is a dump mode reading of
the channel status and data registers regardless of the dump bit
value. Use the channel bits in the channel status register to
check/recognize which channel data is actually being
shifted out.
Note that the last completed conversion result is being read.
Therefore the RDYFN bit in the I/O port register should be 0,
and reading the result should always start before the next
conversion is completed.
The AD7734 will stay in continuous read mode as long as the
DIN pin is low while the CS pin is low; therefore, write 0 to the
AD7734 while reading in continuous read mode. To exit
continuous read mode, take the DIN pin high for at least 100 ns
after a read is complete. (Write 80h to the AD7734 to exit
continuous reading.)
Taking the DIN pin high does not change the Cont RD bit in
the mode register. Therefore, the next write of 48h starts the
continuous read mode again. To completely stop the continuous
read mode, write to the mode register to clear the Cont RD bit.
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