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參數(shù)資料
| 型號： | DC956A |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 9/40頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2485 |
| 軟件下載： | QuikEval System |
| 設(shè)計(jì)資源： | DC956A Design File DC956A Schematic |
| 標(biāo)準(zhǔn)包裝： | 1 |
| 系列： | Easy Drive™, QuikEval™ |
| ADC 的數(shù)量： | 1 |
| 位數(shù)： | 24 |
| 采樣率（每秒）： | 6.8 |
| 數(shù)據(jù)接口： | I²C，串行 |
| 工作溫度： | 0°C ~ 70°C |
| 已用 IC / 零件： | LTC2485 |
| 已供物品： | 板 |
| 相關(guān)產(chǎn)品： | LTC2485CDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#TRPBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485IDD#PBF-ND - IC ADC 24BIT I2C 10-DFN LTC2485CDD#PBF-ND - IC ADC 24BIT I2C 10-DFN |
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LTC2485
17
2485fc
APPLICATIONS INFORMATION
OPERATION SEQUENCE
The LTC2485 acts as a transmitter or receiver. The device
may be programmed to perform several functions. These
include measuring an external differential input signal or
an integrated temperature sensor, selecting line frequency
rejection (50Hz, 60Hz, or simultaneous 50Hz and 60Hz),
and a 2x speed up mode.
Continuous Read
In applications where the conguration does not need
to change for each conversion cycle, the conversion
result can be continuously read. The conguration
remains unchanged from the last value written into
the device. If the device has not been written to since
power up, the conguration is set to the default value
(Input External, simultaneous 50Hz/60Hz rejection, and
1x speed mode). The operation sequence is shown in
Figure 6. When the conversion is nished, the device
may be addressed for a read operation. At the end of a
read operation, a new conversion begins. At the conclu-
sion 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 LTC2485 generates a NAK signal indicating
the conversion cycle is in progress.
Continuous Read/Write
Once the conversion cycle is concluded, the LTC2485 can
be written to then read from, using the repeated Start
(Sr) command.
Figure 7 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 all 32
bits are read out of the device or after the STOP command
and uses the newly programmed conguration data.
S
ACK
DATA
Sr
DATA TRANSFERRING
P
SLEEP
DATA INPUT/OUTPUT
CONVERSION
7-BIT ADDRESS
R/W
2485 F05
7-BIT ADDRESS
CONVERSION
SLEEP
DATA OUTPUT
7-BIT ADDRESS
SS
RR
ACK
READ
PP
2485 F06
7-BIT ADDRESS
CONVERSION
ADDRESS
SLEEP
DATA OUTPUT
DATA INPUT
7-BIT ADDRESS
S
R
W ACK
ACK
WRITE
Sr
P
READ
2485 F07
Figure 5. The LTC2485 Conversion Sequence
Figure 6. Consecutive Reading at the Same Conguration
Figure 7. Write, Read, Start Conversion
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