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| 型号： | LTC2411-1CMS#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/40页 |
| 文件大小： | 0K |
| 描述： | IC A/DCONV DIFF INPUT&REF 10MSOP |
| 标准包装： | 2,500 |
| 位数： | 24 |
| 采样率（每秒）： | 6.8 |
| 数据接口： | MICROWIRE?，串行，SPI? |
| 转换器数目： | 2 |
| 功率耗散（最大）： | 1mW |
| 电压电源： | 单电源 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
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LTC2411/LTC2411-1
15
Table 3. LTC2411/LTC2411-1 State Duration
State
Operating Mode
Duration
CONVERT
Internal Oscillator
FO = LOW (LTC2411)
133ms, Output Data Rate
≤ 7.5 Readings/s
(60Hz Rejection)
FO = HIGH (LTC2411)
160ms, Output Data Rate
≤ 6.2 Readings/s
(50Hz Rejection)
FO = LOW (LTC2411-1)
147ms, Output Data Rate
≤ 6.8 Readings/s
(Simultaneous 50Hz/60Hz Rejection)
External Oscillator
FO = External Oscillator
20510/fEOSCs, Output Data Rate ≤ fEOSC/20510 Readings/s
with Frequency fEOSC kHz
(fEOSC/2560 Rejection)
SLEEP
As Long As CS = HIGH Until CS = LOW and SCK
DATA OUTPUT
Internal Serial Clock
FO = LOW/HIGH (LTC2411)
As Long As CS = LOW But Not Longer Than 1.67ms
(Internal Oscillator)
(32 SCK cycles)
FO = LOW (LTC2411-1)
As Long As CS = LOW But Not Longer Than 1.83ms
(Internal Oscillator)
(32 SCK cycles)
FO = External Oscillator with
As Long As CS = LOW But Not Longer Than 256/fEOSCms
Frequency fEOSC kHz
(32 SCK cycles)
External Serial Clock with
As Long As CS = LOW But Not Longer Than 32/fSCKms
Frequency fSCK kHz
(32 SCK cycles)
converter status and during the data output state it is used
to read the conversion result.
Serial Clock Input/Output (SCK)
The serial clock signal present on SCK (Pin 9) is used to
synchronize the data transfer. Each bit of data is shifted out
the SDO pin on the falling edge of the serial clock.
In the Internal SCK mode of operation, the SCK pin is an
output and the LTC2411/LTC2411-1 create their own se-
rial clock by dividing the internal conversion clock by 8. In
the External SCK mode of operation, the SCK pin is used
as input. The internal or external SCK mode is selected on
power-up and then reselected every time a HIGH-to-LOW
transition is detected at the CS pin. If SCK is HIGH or float-
ing at power-up or during this transition, the converter
enters the internal SCK mode. If SCK is LOW at power-up
or during this transition, the converter enters the external
SCK mode.
Serial Data Output (SDO)
The serial data output pin, SDO (Pin 8), provides the result
of the last conversion as a serial bit stream (MSB first)
during the data output state. In addition, the SDO pin is
used as an end of conversion indicator during the conver-
sion and sleep states.
When CS (Pin 7) is HIGH, the SDO driver is switched to a
high impedance state. This allows sharing the serial
interface with other devices. If CS is LOW during the
convert or sleep state, SDO will output EOC. If CS is LOW
during the conversion phase, the EOC bit appears HIGH on
the SDO pin. Once the conversion is complete, EOC goes
LOW. The device remains in the sleep state until the first
rising edge of SCK occurs while CS = LOW.
Chip Select Input (CS)
The active LOW chip select, CS (Pin 7), is used to test the
conversion status and to enable the data output transfer as
described in the previous sections.
In addition, the CS signal can be used to trigger a new
conversion cycle before the entire serial data transfer has
been completed. The LTC2411/LTC2411-1 will abort any
serial data transfer in progress and start a new conversion
cycle anytime a LOW-to-HIGH transition is detected at the
CS pin after the converter has entered the data output state
(i.e., after the first rising edge of SCK occurs with
CS = LOW).
APPLICATIO S I FOR ATIO
WU
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