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參數資料
| 型號： | DC846A |
| 廠商： | Linear Technology |
| 文件頁數： | 9/28頁 |
| 文件大?。?/td> | 0K |
| 描述： | BOARD DELTA SIGMA ADC LTC2447 |
| 軟件下載： | QuikEval System |
| 設計資源： | DC846A Design File DC846A Schematic |
| 標準包裝： | 1 |
| 系列： | QuikEval™ |
| ADC 的數量： | 1 |
| 位數： | 24 |
| 采樣率（每秒）： | 8k |
| 數據接口： | MICROWIRE?，串行，SPI? |
| 已用 IC / 零件： | LTC2447 |
| 已供物品： | 板 |
| 相關產品： | LTC2447IUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447CUHF#PBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447IUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN LTC2447CUHF#TRPBF-ND - IC ADC 24BIT 8CH HI SPEED 38QFN |
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LTC2446/LTC2447
17
24467fa
APPLICATIO S I FOR ATIO
WU
U
External Serial Clock, 3-Wire I/O
This timing mode utilizes a 3-wire serial I/O interface. The
conversion result is shifted out of the device by an exter-
nally generated serial clock (SCK) signal, see Figure 6. CS
may be permanently tied to ground, simplifying the user
interface or isolation barrier. The external serial clock
mode is selected by tying EXT LOW.
Since CS is tied LOW, the end-of-conversion (EOC) can be
continuously monitored at the SDO pin during the convert
and sleep states. Conversely, BUSY (Pin 2) may be used
to monitor the status of the conversion cycle. EOC or BUSY
may be used as an interrupt to an external controller
Figure 6. External Serial Clock, CS = 0 Operation (3-Wire)
indicating the conversion result is ready. EOC = 1
(BUSY = 1) while the conversion is in progress and
EOC = 0 (BUSY = 0) once the conversion enters the low
power sleep state. On the falling edge of EOC/BUSY, the
conversion result is loaded into an internal static shift
register. The device remains in the sleep state until the
first rising edge of SCK. Data is shifted out the SDO pin
on each falling edge of SCK enabling external circuitry to
latch data on the rising edge of SCK. EOC can be latched
on the first rising edge of SCK. On the 32nd falling edge
of SCK, SDO and BUSY go HIGH (EOC = 1) indicating a
new conversion has begun.
CS
SCK
(EXTERNAL)
SDI
SDO
BUSY
24467 F06
CONVERSION
SLEEP
DATA OUTPUT
CONVERSION
MSB
BIT 28 BIT 27 BIT 26 BIT 25 BIT 24 BIT 23 BIT 22 BIT 21
BIT 20 BIT 19
BIT 0
LSB
SIG
BIT 29
“0”
BIT 30
EOC
BIT 31
1
0
EN
SGL
GLBL
A1
A0
OSR3
OSR2
OSR1
OSR0
TWOX
ODD
12345
6
7
89
10
11
12
13
14
32
DON'T CARE
VCC
FO
REF67+
REF67–
CH0
CH1
CH2
CH7
COM
REFG+
REFG–
REF01+
REF01–
SCK
SDI
SDO
CS
GND
28
29
30
11
10
35
24
23
8
9
12
22
7
38
37
1,4,5,6,31,32,33
36
34
USER SELECTABLE
REFERENCES
0.1V TO VCC
ANALOG
INPUTS
...
2
= EXTERNAL OSCILLATOR
= INTERNAL OSCILLATOR
1
F
4.5V TO 5.5V
LTC2446
3-WIRE
SPI INTERFACE
BUSY
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