參數(shù)資料
型號: LTC2408IG
廠商: LINEAR TECHNOLOGY CORP
元件分類: ADC
英文描述: 4-/8-Channel 24-Bit uPower No Latency ADCs
中文描述: 8-CH 24-BIT DELTA-SIGMA ADC, SERIAL ACCESS, PDSO28
封裝: 0.209 INCH, PLASTIC, SSOP-28
文件頁數(shù): 19/36頁
文件大小: 351K
代理商: LTC2408IG
19
LTC2404/LTC2408
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Typically, CSADC remains LOW during the data output
state. However, the data output state may be aborted by
pulling CSADC HIGH anytime between the first rising edge
and the 32nd falling edge of SCK, see Figure 9. On the
rising edge of CSADC, the device aborts the data output
state and immediately initiates a new conversion. This is
useful for systems not requiring all 32 bits of output data,
aborting an invalid conversion cycle or synchronizing the
start of a conversion.
Internal Serial Clock
This timing mode uses an internal serial clock to shift out
the conversion result and program the multiplexer, see
Figure 10. A CS signal directly drives the CSADC input,
while the inverse of CS drives the CSMUX input. The CS
signal is used to monitor and control the state of the
conversion cycles as well as enable the channel selection.
The multiplexer is programmed during the data output
Figure 8. Use of Look Ahead to Program Multiplexer After Data Output
SCK/CLK
SDO
CONVERTER
STATE
D
IN
CSADC/
CSMUX
MSB
SUB
LSB
EXR
SIG
BIT0
LSB
BIT4
BIT27BIT26
BIT28
BIT29
BIT30
BIT31
24048 F08
TEST EOC
CONV
SLEEP
DATA OUTPUT
INTERNAL CALIBRATION
66ms LOOK AHEAD
133ms CONVERSION CYCLE (OUTPUT RATE = 7.5Hz)
CONVERSION ON SELECTED CHANNEL
DON’T CARE
DON’T CARE
EN
D2
D1
D0
HI-Z
TEST EOC
66ms CONVERT
Figure 9. External Serial Clock with Reduced Data Output Length Timing Diagram
SCK/CLK
SDO
D
IN
CSADC/
CSMUX
V
CC
CS
SCK
F
O
V
REF
CSMUX
CSADC
SCK
CLK
MUXOUT
ADCIN
D
IN
SDO
GND
0.1V
TO V
CC
–0.12V
REF
TO 1.12V
REF
CH0
TO CH7
2.7V TO 5.5V
LTC2404/LTC2408
MSB
EXR
SIG
LSB
BIT8
BIT9
BIT27 BIT26
BIT28
BIT29
BIT30
BIT31
24048 F09
= 50Hz REJECTION
= EXTERNAL OSCILLATOR
= 60Hz REJECTION
V
CC
TEST EOC
DON’T CARE
DON’T CARE
EN
D2
D1
D0
HI-Z
HI-Z
TEST EOC
相關(guān)PDF資料
PDF描述
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