LTC1292CCN8#PBF Linear Technology, LTC1292CCN8#PBF Datasheet - Page 23

• Manufacturer Part Number: LTC1292CCN8#PBF
• Description: IC DATA ACQ SYSTEM 12BIT 8-DIP
• Manufacturer: Linear Technology
• Type: Data Acquisition System (DAS)r

Specifications of LTC1292CCN8#PBF

• Resolution (bits): 12 b
• Sampling Rate (per Second): 60k
• Data Interface: Serial, Parallel
• Voltage Supply Source: Single Supply
• Voltage - Supply: 5V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Through Hole
• Package / Case: 8-DIP (0.300", 7.62mm)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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 5 V 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.
A
+
PPLICATI
GND
22 F
4
ISOLATED
LT1025A
5V
V
IN
2
R
5
J
H
–
TYPE J
0.1%
0 C – 500 C TEMPERATURE RANGE
O
2k
+
U
+
3
S
2
1 F
0.1%
3.4k
+
–
LTC1050
I FOR ATIO
U
0.33 F
7
4
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.
0.1%
178k
6
W
47
1 F
Figure 31. Opto-Isolated Temperature Monitor
+
1N4148
1
2
3
4
U
GND
CS
+IN
–IN
LT1019-2.5
LTC1292
D
V
CLK
V
OUT
REF
CC
4.7 F
5
8
7
6
3
+
100k
DATA OUT
5V/DIV
CLK IN
1N4148
CS
A
A
+
1N4148
0.1 F
74C14
10k
Figure 30. Opto-Isolated Temperature
Monitor Digital Waveforms
1k
LTC1292/LTC1297
20 s/DIV
5k
3
4
500k
1
2
4N28s
6
6
500k
1
2
3
4
5V
1k
5V
5k
LTC1292/7 F31
23
CLK IN
DATA
OUT
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