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參數(shù)資料
| 型號(hào)： | EVAL-AD7298SDZ |
| 廠商： | Analog Devices Inc |
| 文件頁數(shù)： | 10/25頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD EVAL FOR AD7298 |
| 標(biāo)準(zhǔn)包裝： | 1 |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 12 |
| 采樣率（每秒）： | 1M |
| 數(shù)據(jù)接口： | DSP，串行，SPI? |
| 工作溫度： | -40°C ~ 125°C |
| 已用 IC / 零件： | AD7298 |
| 已供物品： | 板，纜線，CD |
AD7298
Rev. B | Page 17 of 24
MODES OF OPERATION
The AD7298 offers different modes of operation that are
designed to provide additional flexibility for the user. These
options can be chosen by programming the content of the
control register to select the desired mode.
TRADITIONAL MULTICHANNEL MODE OF
OPERATION
The AD7298 can operate as a traditional multichannel
ADC, where each serial transfer selects the next channel for
conversion. One must write to the control register to configure
and select the desired input channel prior to initiating any
conversions. In the traditional mode of operation, the CS signal
is used to frame the first write to the converter on the DIN pin.
In this mode of operation, the REPEAT bit in the control
register is set to a low logic level, 0, thus the REPEAT function
is not in use. The data, which appears on the DOUT pin during
the initial write to the control register, is invalid. The first CS
falling edge initiates a write to the control register to configure
the device; a conversion is then initiated for the selected analog
input channel (VIN0) on the subsequent (2nd) CS falling edge; the
third CS falling edge will have the result (VIN2) available for
reading. The AD7298 operates with one cycle latency, thus the
conversion result corresponding to each conversion is available
one serial read cycle after the cycle in which the conversion was
initiated.
As the device operates with one cycle latency, the control
register configuration sets up the configuration for the next
conversion, which is initiated on the next CS falling edge, but
the first bit of the corresponding result is not clocked out until
the subsequent falling CS edge, as shown in
If more than one channel is selected in the control register, the
AD7298 converts all selected channels sequentially in ascending
order on successive CS falling edges. Once all the selected
channels in the control register are converted, the AD7298
ceases converting until the user rewrites to the control register
to select the next channel for conversion. This operation is
shown in
. DOUT returns all 1s if the sequence of
conversions is completed or if no channel is selected.
CS
SCLK
DOUT
DIN
1
12
16
1
16
1
16
1
16
CONVERSION RESULT
FOR CHANNEL 4
CONVERSION RESULT
FOR CHANNEL 1
INVALID DATA
DATA WRITTEN TO CONTROL
REGISTER CHANNEL 4 SELECTED
DATA WRITTEN TO CONTROL
REGISTER CHANNEL 1 SELECTED
NO WRITE TO THE
CONTROL REGISTER
08
75
4-
00
9
NO WRITE TO THE
CONTROL REGISTER
Figure 25. Configuring a Conversion and Read with the AD7298. One channel selected for conversion.
CS
SCLK
DOUT
DIN
112
16
1
16
1
16
CONVERSION RESULT
FOR CHANNEL 1
CONVERSION RESULT
FOR CHANNEL 5
CONVERSION RESULT
FOR CHANNEL 2
INVALID DATA
NO WRITE TO THE
CONTROL REGISTER
NO WRITE TO THE
CONTROL REGISTER
NO WRITE TO THE
CONTROL REGISTER
DATA WRITTEN TO CONTROL
REGISTER CH 1 AND 2 SELECTED
CS
SCLK
DOUT
DIN
116
1
16
DATA WRITTEN TO CONTROL
REGISTER CHANNEL 5 SELECTED
08
75
4-
01
0
Figure 26. Configuring a Conversion and Read with the AD7298. Numerous channels selected for conversion.
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