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參數(shù)資料
| 型號(hào)： | LTC2489CDEPBF |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 16-Bit 2-/4-Channel ADC with Easy Drive Input Current Cancellation and I2C Interface |
| 中文描述： | 16位2-/4-Channel ADC，具有易于驅(qū)動(dòng)的輸入電流取消和I2C接口 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大?。?/td> | 341K |
| 代理商： | LTC2489CDEPBF |
LTC2489
14
2489f
Operation Sequence
The LTC2489 acts as a transmitter or receiver, as shown
in Figure 4. The device may be programmed to select
an input channel, differential or single-ended mode, and
channel polarity.
Table 4. Address Assignment
CA1
LOW
LOW
LOW
HIGH
HIGH
HIGH
FLOAT
FLOAT
FLOAT
CA0
LOW
HIGH
FLOAT
LOW
HIGH
FLOAT
LOW
HIGH
FLOAT
ADDRESS
0010100
0010110
0010101
0100110
0110100
0100111
0010111
0100101
0100100
Continuous Read
In applications where the input channel does not need to
change for each cycle, the conversion can be continuously
performed and read without a write cycle (see Figure 5).
The input channel remains unchanged from the last
value written into the device. If the device has not been
written to since power up, the channel selection is set to
the default value of CH0 = IN
+
, CH1 = IN
–
. At the end of
a read operation, a new conversion automatically begins.
At the conclusion of the conversion cycle, the next result
may be read using the method described above. If the
conversion cycle is not concluded and a valid address
selects the device, the LTC2489 generates a NAK signal
indicating the conversion cycle is in progress.
Continuous Read/Write
Once the conversion cycle is concluded, the LTC2489 can
be written to and then read from using the Repeated Start
(Sr) command.
APPLICATIONS INFORMATION
S
ACK
DATA
Sr
DATA TRANSFERRING
P
7-BIT ADDRESS
R/W
2489 F04
CONVERSION
CONVERSION
SLEEP
DATA INPUT/OUTPUT
7-BIT ADDRESS
7-BIT ADDRESS
S
S
R
R
ACK
ACK
READ
READ
P
P
2489 F05
CONVERSION
CONVERSION
CONVERSION
SLEEP
DATA OUTPUT
DATA INPUT
SLEEP
Figure 4. Conversion Sequence
Figure 5. Consecutive Reading with the Same Input/Configuration
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