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參數(shù)資料
| 型號(hào)： | LTC1297DCJ8#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | 1-CH 12-BIT SUCCESSIVE APPROXIMATION ADC, SERIAL ACCESS, CDIP8 |
| 封裝： | 0.300 INCH, HERMETIC SEALED, CERAMIC, DIP-8 |
| 文件頁(yè)數(shù)： | 16/24頁(yè) |
| 文件大小： | 312K |
| 代理商： | LTC1297DCJ8#PBF |
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23
LTC1292/LTC1297
12927fb
U
S
A
O
PPLICATI
WU
U
I FOR ATIO
Opto-Isolated Temperature Monitor
Amplification of sensor outputs is often required to
generate a signal large enough to be properly digitized.
For example, a J-type thermocouple provides only
52
V/°C. The 5V offset of the LTC1050 chopper op
amp generates less than 0.1
°C error (Figure 31). Cold
junction compensation is provided by the LT1025A.
(For more detail see LTC Design Note 5).
In the opto-isolated interface two signals are generated
from one. This allows a two-wire interface to the
LTC1292. A long high signal (>1ms) on the CLK IN input
allows the 0.1
F capacitor to discharge taking CS high.
This resets the A/D for the next conversion. When CLK
IN starts toggling, CS goes low and stays there until the
next extended CLK IN high time. See Figure 30.
5V/DIV
A
CLK IN
CS
DATA OUT
20
s/DIV
+
1 F
TYPE J
J
R
GND
LT1025A
VIN
H
2
3
–
+
LTC1050
7
4
6
+
0.33 F
178k
0.1%
3.4k
0.1%
2k
0.1%
47
+
1 F
GND
LTC1292
VCC
–IN
+IN
CS
CLK
DOUT
VREF
+
4.7 F
3
+
0.1 F
10k
1N4148
8
7
6
5
1
2
3
4
+
22 F
LT1019-2.5
500k
1
2
1k
CLK IN
3
4
500k
3
4
5k
DATA
OUT
1
2
6
1k
4N28s
1N4148
0
°C – 500°C TEMPERATURE RANGE
ISOLATED
5V
4
5
+
–
A
6
100k
74C14
5V
5k
LTC1292/7 F31
1N4148
Figure 31. Opto-Isolated Temperature Monitor
Figure 30. Opto-Isolated Temperature
Monitor Digital Waveforms
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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| LTC1298CN8PBF | 制造商:Linear Technology 功能描述:12bit A-D converter,LTC1298CN8 DIP8 |
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