參數(shù)資料
型號(hào)： LTC2486IDE
廠商： LINEAR TECHNOLOGY CORP
元件分類： ADC
英文描述： 16-Bit 2-/4-Channel ツヒ ADC with PGA and Easy Drive Input Current Cancellation
中文描述： 4-CH 16-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PQCC14
封裝： 4 X 3 MM, PLASTIC, MO-229WGED-3, QFN-14
文件頁(yè)數(shù)： 14/36頁(yè)
文件大?。?/td> 596K
代理商： LTC2486IDE
LTC2486
14
2486f
APPLICATIONS INFORMATION
CONVERTER OPERATION
Converter Operation Cycle
The LTC2486 is a multi-channel, low power, delta-sigma,
analog-to-digital converter with an easy-to-use, 4-wire
interface and automatic differential input current cancella-
tion. Its operation is made up of four states (See Figure 2).
The converter operating cycle begins with the conversion,
followed by the sleep state, and ends with the data input/
output cycle. The 4-wire interface consists of serial data
output (SDO), serial clock (SCK), chip select (
C
S) and
serial data input (SDI).The interface, timing, operation
cycle, and data output format is compatible with Linear’s
entire family of SPI
ΔΣ
converters.
Initially, at power up, the LTC2486 performs a conversion.
Once the conversion is complete, the device enters the
sleep state. While in this sleep state, if
C
S is HIGH, power
consumption is reduced by two orders of magnitude. The
part remains in the sleep state as long as
C
S is HIGH. The
conversion result is held indefinitely in a static shift register
while the part is in the sleep state.
Once
C
S is pulled LOW, the device powers up, exits the
sleep state, and enters the data input/output state. If
C
S
is brought HIGH before the first rising edge of SCK, the
device returns to the sleep state and the power is reduced.
If
C
S is brought HIGH after the first rising edge of SCK, the
data output cycle is aborted and a new conversion cycle
begins. The data output corresponds to the conversion
just completed. This result is shifted out on the serial
data output pin (SDO) under the control of the serial
clock pin (SCK). Data is updated on the falling edge of
SCK allowing the user to reliably latch data on the rising
edge of SCK (See Figure 3). The configuration data for
the next conversion is also loaded into the device at this
time. Data is loaded from the serial data input pin (SDI)
on each rising edge of SCK. The data input/output cycle
concludes once 24 bits are read out of the ADC or when
C
S is brought HIGH. The device automatically initiates a
new conversion and the cycle repeats.
Through timing control of the
C
S and SCK pins, the LTC2486
offers several flexible modes of operation (internal or
external SCK and free-running conversion modes). These
various modes do not require programming and do not
disturb the cyclic operation described above. These modes
of operation are described in detail in the Serial Interface
Timing Modes section.
Ease of Use
The LTC2486 data output has no latency, filter settling
delay, or redundant data associated with the conversion
cycle. There is a one-to-one correspondence between the
conversion and the output data. Therefore, multiplexing
multiple analog inputs is straightforward. Each conver-
sion, immediately following a newly selected input or
mode, is valid and accurate to the full specifications of
the device.
The LTC2486 automatically performs offset and full scale
calibration every conversion cycle independent of the
input channel selected. This calibration is transparent to
the user and has no effect with the operation cycle de-
scribed above. The advantage of continuous calibration
is extreme stability of offset and full-scale readings with
respect to time, supply voltage variation, input channel,
and temperature drift.
Figure 2. LTC2486 State Transition Diagram
CONVERT
SLEEP
CHANNEL SELECT
CONFIGURATION SELECT
DATA OUTPUT
POWER UP
IN
+
= CH0, IN
–
= CH1
50/60Hz, GAIN = 1, 1X
2486 F02
CS = LOW
AND
SCK
相關(guān)PDF資料
PDF描述
LTC2487 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
LTC2487CDEPBF 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
LTC2487CDETRPBF 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
LTC2487IDEPBF 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
LTC2487IDETRPBF 16-Bit 2-/4-Channel ADC with PGA, Easy Drive and I2C Interface
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