參數(shù)資料
型號： DC1012A-B
廠商： Linear Technology
文件頁數(shù)： 8/28頁
文件大?。?/td> 0K
描述： BOARD DELTA SIGMA ADC LTC2497
軟件下載： QuikEval System
設計資源： DC1012A Schematic
DC1012A Design File
標準包裝： 1
系列： Easy Drive™, QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 16
采樣率（每秒）： 7.5
數(shù)據(jù)接口： I²C，串行
已用 IC / 零件： LTC2497
已供物品： 板
相關產(chǎn)品： LTC2497CUHF#TRPBF-ND - IC ADC 16BIT W/PGA 38-QFN
LTC2497IUHF#TRPBF-ND - IC ADC 16BIT W/PGA 38-QFN
LTC2497IUHF#PBF-ND - IC ADC 16BIT W/PGA 38-QFN
LTC2497CUHF#PBF-ND - IC ADC 16BIT W/PGA 38-QFN
LTC2497
2497fa
Initiating a New Conversion
When the LTC2497 finishes a conversion, it automatically
enters the sleep state. Once in the sleep state, the device is
ready for a read operation. After the device acknowledges
a read request, the device exits the sleep state and enters
the data output state. The data output state concludes and
the LTC2497 starts a new conversion once a Stop condi-
tion is issued by the master or all 24 bits of data are read
out of the device.
Duringthedatareadcycle,aStopcommandmaybeissued
by the master controller in order to start a new conversion
and abort the data transfer. This Stop command must be
issued during the ninth clock cycle of a byte read when
the bus is free (the ACK/NAK cycle).
LTC2497 Address
The LTC2497 has three address pins (CA0, CA1, CA2).
Each may be tied high, low, or left floating enabling one
of 27 possible addresses (see Table 4).
In addition to the configurable addresses listed in Table 4,
the LTC2497 also contains a global address (1110111)
whichmaybeusedforsynchronizingmultipleLTC2497sor
otherLTC24XXdelta-sigmaI2Cdevices,(SeeSynchronizing
Multiple LTC2497s with Global Address Call section).
Operation Sequence
The LTC2497 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.
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 writ-
ten 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 conver-
Table 4. Address Assignment
CA2
CA1
CA0
ADDRESS
LOW
0010100
LOW
HIGH
0010110
LOW
FLOAT
0010101
LOW
HIGH
LOW
0100110
LOW
HIGH
0110100
LOW
HIGH
FLOAT
0100111
LOW
FLOAT
LOW
0010111
LOW
FLOAT
HIGH
0100101
LOW
FLOAT
0100100
HIGH
LOW
1010110
HIGH
LOW
HIGH
1100100
HIGH
LOW
FLOAT
1010111
HIGH
LOW
1110100
HIGH
1110110
HIGH
FLOAT
1110101
HIGH
FLOAT
LOW
1100101
HIGH
FLOAT
HIGH
1100111
HIGH
FLOAT
1100110
FLOAT
LOW
0110101
FLOAT
LOW
HIGH
0110111
FLOAT
LOW
FLOAT
0110110
FLOAT
HIGH
LOW
1000111
FLOAT
HIGH
1010101
FLOAT
HIGH
FLOAT
1010100
FLOAT
LOW
1000100
FLOAT
HIGH
1000110
FLOAT
1000101
sion cycle is not concluded and a valid address selects
the device, the LTC2497 generates a NAK signal indicating
the conversion cycle is in progress.
Continuous Read/Write
Once the conversion cycle is concluded, the LTC2497 can
be written to and then read from using the Repeated Start
(Sr) command.
Figure 6 shows a cycle which begins with a data Write,
a repeated Start, followed by a Read and concluded with
a Stop command. The following conversion begins after
applicaTions inForMaTion
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